SILEF Silver Elephant Mining Corporation (PK)

Mongolia Projects Map

A summary overview of exploration projects is shown in the following table:

There are no identified mineral reserves or mineral resources on the Sunawayo Project, Triunfo Project, Ulaan Ovoo Property, Chandgana Project or Titan.

For more information on the Pulacayo Project in Bolivia, please see "Pulacayo Project, Bolivia" below.

PULACAYO PROJECT, BOLIVIA

The scientific and technical information in this section of this Annual Report that specifically relates to the current Pulacayo Project mineral resource estimates for the Pulacayo and Paca deposits has been extracted or summarized from the 2022 Pulacayo Technical Report. The 2022 Pulacayo Technical Report was prepared by Matthew Harrington, P.Geo., of Mercator Geological Services Limited, Michael Cullen, P.Geo. of Mercator Geological Services Limited and Osvaldo Arce, Ph.D., P. Geo., Independent Consultant. Additional information presented below that pertains to the Pulacayo Project but does not specifically appear in the 2022 Pulacayo Technical Report has been provided by the Company. None of the qualified persons who prepared the 2022 Pulacayo Technical Report at affiliates of the Company. The 2022 Pulacayo Technical Report is filed as Exhibit 15.1 to this report.

The discussion below includes the Pulacayo and Paca silver-lead-zinc deposits and related concessions located in Bolivia (the "Pulacayo Project").

On January 2, 2015, pursuant to the terms of the acquisition agreement entered into between the Company and Apogee Silver Ltd. ("Apogee") the Company acquired the Pulacayo Project through the acquisition of the issued and outstanding shares of ASC Holdings Limited and ASC Bolivia LDC, which together, hold the issued and outstanding shares of ASC Bolivia LDC Sucursal Bolivia. ASC Bolivia LDC Sucursal Bolivia controls the mining rights to the concessions through a separate joint venture agreement with the Pulacayo Ltda. Mining Cooperative (the "Pulacayo Mining Cooperative") who hold the mining rights through a lease agreement with state owned Mining Corporation of Bolivia, COMIBOL.

The Pulacayo Project mining rights are recognized by two legally independent contractual arrangements, one covering all, except Apuradita from the Pulacayo MPC between the Company and COMIBOL, a Bolivian state mining company, and the original holder of the rights, executed on October 3, 2019. The Pulacayo MPC grants the Company the 100% exclusive right to develop and mine at the Pulacayo and Paca concessions for up to 30 years against certain royalty payments. It is comparable to a mining license in Canada or the United States. In connection with Apuradita, its rights are covered by a second contractual arrangement, with the Bolivian Jurisdictional Mining Authority, acting for the State, which is in process of formalization, as a mean of recognition of the acquired rights to what was originally the mining concession. Until such time as the contract is formalized, all mining rights, as recognized in the Bolivian Mining Law 535, can be exercised by the holder of the ex-concession.

An independent valuation of the project was completed in March 2020 and indicated a valuation of approximately $25 million.

Project Location

The Pulacayo Project comprises seven mining areas covering an area of approximately 3,560 hectares of contiguous areas centered on the historical Pulacayo mine and town site. The Pulacayo Project is located 18 km east of the town of Uyuni in the Department of Potosí, in southwestern Bolivia. It is located 460 km south-southeast of the national capital of La Paz and 150 km southwest of the City of Potosí, which is the administrative capital of the department. The Pulacayo Project is fully permitted with secured social licenses for mining.

Accessibility, Climate, Local Resources, Infrastructure and Physiography

Accessibility

Bolivia is a landlocked country located in central South America and includes diverse geographic and climatic conditions that range from snow-capped peaks and high-altitude plateaus to vast, low-lying grasslands and rainforests. The country is normally accessible by international air travel from Miami (American Airlines), Mexico City, Brazil, Chile (LAN), Argentina and Peru (Taca Airlines). In addition, local Bolivian airlines fly regular internal flights between major cities, with several flights a week to a newly paved runway at Uyuni city, located 18 km south of the Pulacayo property.

The principal highways are generally paved, and heavy trucks and buses dominate road traffic outside of the major cities. For the most part, road freight service functions adequately even to small remote villages. The Pulacayo project is accessed from La Paz by means of a paved road, which runs to the area of Huari, passing through Oruro. It can also be accessed by the road between Oruro and Potosí and from Potosí to Uyuni by a good quality paved road. Paving of the road from Potosí to Uyuni began in 2007 and has now been completed to Potosi. Secondary roads can be best described as "tracks" and winding, single lane roads are often precariously carved out of steep slopes.

There is also a reasonably well-developed rail system with connections south to Argentina, east to Brazil and west to Chile and the port of Antofagasta. Rail service from Uyuni connects with Oruro, Atocha, Tupiza, and Villazon (on the border with Argentina). Uyuni is also connected by railway to Chile through Estación Abaroa. Disused rail lines exist between Uyuni-Potosí and Oruro-La Paz. The figure below presents major highway and rail routes of Bolivia relative to the Pulacayo project's location.

Major Routes and Physiographic Regions in Bolivia

Climate and Physiography

Two Andean mountain chains run through western Bolivia, with many peaks rising to elevations greater than 6,000 m above sea level. The western Cordillera Occidental Real forms Bolivia's western boundary with Peru and Chile, extending southeast from Lake Titicaca and then south across central Bolivia to join with the Cordillera Central along the country's southern border with Argentina. Between these two mountain chains is the Altiplano, a high flat plain system at elevations between 3,500 m and 4,000 m above sea level. East of the Cordillera Central a lower altitude region of rolling hills and fertile basins having a tropical climate occurs between elevations of 300 m and 400 m above sea level. To the north, the Andes adjoin tropical lowlands of Brazil's Amazon Basin.

Climate within Bolivia is altitude related. The rainy period lasts from November to March and corresponds with the southern hemisphere's summer season. Of the major cities, only Potosí receives regular snowfalls, with these typically occurring between February and April at the end of the rainy season. La Paz and Oruro occasionally receive light snow. On the Altiplano and in higher altitude areas, sub-zero temperatures are frequent at night throughout the year. Snow-capped peaks are present year-round at elevations greater than approximately 5,200 m.

The Pulacayo Project area is located immediately southwest of the Cosuño Caldera and local topographic relief is gentle to moderate, with elevations ranging between 4,000 m and 4,500 m above sea level. The Paca and Pulacayo volcanic domes are volcanic structures that exist as prominent topographic highs in this area. The area has a semi-arid climate, with annual rainfall of approximately 100 mm and a mean summer temperature of 12° C between October and March. During winter, minimum temperatures reach the -20 to -25° C range and summer maximums in the 18 to 20° C range occur in June and July. Yearly mean temperature is 5.5° C. Vegetation is sparse to non-existent and consists of only local low bushes.

Local resources and Infrastructure

Bolivia has a long history as a significant primary producer of silver and tin, with associated secondary production of gold, copper, antimony, bismuth, tungsten, sulphur and iron. The country also contains sizeable reserves of natural gas that have not been fully developed to date due to export issues and limited access to required infrastructure.

The country has an abundance of hydroelectric power and transmission lines which parallel the road system provide service to most major settlements. Remote villages generally have diesel generators which run infrequently during evening hours. Transmission lines from the hydroelectric plants of Landara, Punutuma, and Yura that were reconditioned by a joint venture between COMIBOL and the Valle Hermoso Electrical Company pass within a few kilometers of Pulacayo.

Telephone service and internet access are available in most areas and cellular telephone service is widespread. However, coverage is not complete and international connectivity is not ensured. Local communication services in the area are good and consist of an ENTEL-based long-distance telephone service, a GSM signal for cell phones and two antennae for reception and transmission of signals from national television stations. Apogee installed a satellite receiver to provide internet access for its operation and this service is shared with the Pulacayo Mining Cooperative. An adequate supply of potable water for the town is supplied by pipeline from a dam and reservoir (Yana Pollera) facility located 28 km from Pulacayo in the Cerro Cosuño.

Coeur d'Alene Mines Corporation (San Bartolome), Pan American Silver Ltd. (San Vicente), Glencore International plc (Sinchi Wayra) and Sumitomo Corporation (San Cristóbal) are significant international companies with producing mines in this region in recent years. Basic exploration services are available in Bolivia and include several small diamond core drilling contractors, the ALS Group, which operates an analytical services sample preparation facility in Oruro, the SGS Group, which has analytical services and preparation facilities in La Paz, and several locally owned assay facilities. The Bolivian National School of Engineering operates a technical college in Oruro (Universidad Técnica de Oruro) that includes a mineral processing department and laboratory facilities that provide commercial services to the mining industry. In general, an adequate supply of junior to intermediate level geologists, metallurgists, mining engineers and chemists is currently considered to be present in the country.

Since down-sizing of site operations at Pulacayo by Apogee in 2013-2014, the population of the community has dropped to approximately 300 to 400 permanent residents, many of whom are associated with the Pulacayo Mining Cooperative. The village has a state-run school and medical services are provided by the state's Caja Nacional de Seguros (National Insurance Fund). A hospital and clinic function independently. Numerous dwellings and mining related buildings in Pulacayo are owned by COMIBOL and some of these have been donated to the Pulacayo Mining Cooperative. Under terms of the Shared Risk Contract, COMIBOL makes some mining infrastructure available for use by the Company.

Property

Ownership of the Pulacayo Project properties was completed through a number of joint venture agreements. Apogee Minerals Ltd. (renamed "Apogee Silver Ltd." in March 2011) controlled 100% of the Pulacayo Project through an agreement with Golden Minerals Company ("GMC"), the successor of Apex Silver Company before its acquisition by us. GMC's former Bolivian subsidiary, ASC Bolivia LDC Sucursal Bolivia ("ASC"), holds the mining rights to the concessions through a joint venture with the Pulacayo Mining Cooperative, which in turn has a lease agreement with COMIBOL, the state mining corporation of Bolivia. On January 21, 2011, Apogee entered into a definitive agreement with GMC to acquire all of the issued share capital of ASC, which holds a 100% interest in the Pulacayo Project. Pursuant to the applicable agreement, Apogee acquired all of the issued and outstanding shares of the subsidiary from GMC in consideration for Common Shares of Apogee upon closing of the transaction, and an additional block of Common Shares and a cash fee eighteen (18) months following closing of the transaction. In January 2015, Prophecy Coal Corp. (predecessor to the Company) completed a purchase of Apogee Minerals Bolivia S.A., ASC Holdings Limited and ASC Bolivia LDC (which hold ASC, the holder of Apogee's mining joint venture interest in the Pulacayo Project) (collectively, the "Apogee Subsidiaries") and thus Apogee's interest in the mining joint venture. The term of the joint venture agreement is 23 years and started on July 30, 2002. ASC Bolivia LDC is committed to pay to COMIBOL USD$1,000 during the exploration period. During the mining period, ASC Bolivia LDC will pay COMIBOL the equivalent of 2.5% of the Net Smelter Return ("NSR") and 1.5% of the NSR to the Pulacayo Mining Cooperative. On September 1, 2016, the Bolivian government issued Supreme Decree N° 2891 which was confirmed by Law N° 845 dated October 24, 2016. Both regulations revert to the domain of the State, areas over which joint venture agreements, lease or sub-lease agreements have been executed between mining cooperatives and private local or foreign companies, in order to convert such agreements into mining production contracts between the private parties to such agreements and the government. This affects our Pulacayo Joint Venture Agreement. We submitted the required application on December 22, 2016. On October 2, 2019, a new Mining Production Contract (replacing the Joint Venture Agreement) was executed between Apogee Minerals Bolivia S.A. (a subsidiary of the Company) and the state-owned Bolivian Mining Corporation (COMIBOL). The term is 15 years and subject to renewal for another 15 years (total 30 years). COMIBOL is entitled to receive 7% of the Gross Sales Value. No monthly fee payable to COMIBOL has been agreed to.

The current holdings that comprise the Pulacayo Project cover 3,560 ha of surface area and are listed in the table below. All titles, associated agreement and permits are in good standing.

* Special Transitory Authorization - formerly mining concession

History of Production

The Pulacayo area has a very long history of exploration and mining, with this dominated by the Pulacayo deposit itself, where most work has been concentrated on mineralized systems that comprise the TVS and related systems. In contrast, the history of Paca deposit exploration forms a relatively small part of the long-term exploration and mining history of the area. Exploration and related studies carried out since 2001 by Apogee and related firms form the bulk of modern era work completed in the Pulacayo Project area and include over 91,900 m of core drilling, completion of a feasibility study in 2012 and several mineral resource estimates prepared in accordance with NI 43-101.

Mining of silver deposits at the Pulacayo Project area began in the Spanish Colonial Period (c.1545) but early production details do not exist. The first work formally recorded on the property was carried out in 1833 when Mariano Ramírez rediscovered the Pulacayo deposit. In 1857 Aniceto Arce founded the Huanchaca Mining Company of Bolivia and subsequently pursued development and production at Pulacayo. Revenue from the mine funded the first railway line in Bolivia, which in 1888 connected Pulacayo to the port of Antofagasta, Chile. In 1891, reported annual silver production reached 5.7 million ounces and mining operations at Pulacayo at that time were the second largest in Bolivia. Pulacayo production was predominantly from the Veta TVS which had been defined along a strike length of 2.5 km and to a depth of more than 1000 m. In 1923, mining operation ceased due to flooding of the main working levels.

In 1927, Mauricio Hochschild bought the property and re-started mine development. The Veta Cuatro vein was the focus of this work and was intersected at a mine elevation of approximately -266 m. It was proven to continue down-dip to the -776 m elevation where it showed a strike length of 750 m. Several short adits were also established during the Hochschild period at Paca to test a mineralized volcanic conglomeratic unit that outcrops in the deposit area. Work by Hochschild in the district continued until 1952 when the Bolivian government nationalized the mines and administration of the Pulacayo deposit and management was assumed by COMIBOL. Operations continued under COMIBOL until closure in 1959 due to exhaustion of reserves and rising costs. The total production from the Pulacayo mine is estimated by the National Geological and Mineral Service of Bolivia to be 678 million ounces of silver, 200,000 tons of zinc and 200,000 tons of lead (National Geological and Mineral Service of Bolivia Bulletin No. 30, 2002, after Mignon 1989).

In 1956, COMIBOL established the Esmeralda adit that was driven south into the Paca deposit to assess breccia hosted high grade mineralization localized along the andesite-host sequence contact. A total of approximately 250 m of drifting and cross cutting was carried out within the main mineralized zone, distributed between the main adit level and short sub-levels above and below the main level. Workings were established for exploration purposes only and commercial production was not undertaken by COMIBOL.

In 1962, the Pulacayo Mining Cooperative was founded and this local group leased access to the Pulacayo mine from COMIBOL. The Pulacayo Mining Cooperative has carried out small scale mining in the district since that time and continues to do so at present. Efforts are directed toward exploitation of narrow, very high-grade silver mineralization in upper levels of the old mining workings, typically above the San Leon tunnel level.

Modern exploration of the Pulacayo and Paca areas began to a limited degree in the 1980's when various mining and exploration companies targeted epithermal silver and gold mineralization within the volcanic-intrusive system present in the area. In 2001, ASC initiated an exploration program in the district, signed agreements with the Pulacayo Mining Cooperative and COMIBOL and completed programs of regional and detailed geological mapping, topographic surveying and sampling of historical workings. In part, these work programs included the Paca deposit, where 3,130 m of core drilling and 896 m of reverse circulation (RC) drilling were completed, and a mineral resource estimate was prepared. ASC also completed core drilling campaigns at Pulacayo.

In 2005 Apogee signed a joint venture agreement with ASC and subsequently commenced exploration in the region in early 2006. Extensive exploration, economic evaluation, metallurgical studies, mine and mill permitting environmental studies and underground test mining programs were subsequently carried out by Apogee between 2006 and 2015 when the Pulacayo Project was purchased by the Company's precursor, Prophecy Development Corp. (Prophecy). Work was carried out on both the Pulacayo and Paca deposits during this period, with emphasis placed on Pulacayo. Combined results of the ASC and Apogee diamond drilling programs carried out between 2002 and 2012 contributed to the several mineral resource estimates prepared in accordance with NI 43-101 and the CIM Standards in place at the time, and also supported a 2013 Feasibility Study focused on underground mining. Since 2001, ASC and Apogee completed 88,596 m of drilling from surface and underground on the Pulacayo Project, with Apogee programs accounting for 79,129 m of this total.

Geological Setting

Geology

The Pulacayo Project that includes both the Pulacayo and Paca deposits is located on the western flank of a regional anticline that affects sedimentary and igneous rocks of Silurian, Tertiary and Quaternary ages on the western side of the Cordillera Oriental, near the Cordillera-Altiplano boundary. The Uyuni-Khenayani Fault is a reverse fault that crosses the project area and is believed to have controlled localization of volcanic center complexes at Cuzco, Cosuño, Pulacayo and San Cristóbal and related mineralized areas at Pulacayo, Cosuño, El Asiento, Carguaycollu and San Cristóbal. This fault brings Tertiary sediments in contact with Paleozoic formations at surface and is located about 4 km west of Pulacayo. The Pulacayo Project mineralized zones at Pulacayo, Pacamayo and Paca all occur on the west flank of a north-south striking anticline and local topographic highs define Lower Miocene dacitic-andesitic domes and stocks associated with caldera resurgence that intrude the folded section. A younger Miocene-Pliocene phase of volcanism is also superimposed on the anticlinal trend and is marked by pyroclastic deposits and flows of andesitic and rhyolitic composition. Ignimbrites associated with the Cosuño Caldera are the youngest volcanic deposits in the area. A dacitic to andesitic dome complex at the Pulacayo Property intruded the folded sedimentary section and forms the main topographic highs that occur on the property.

Exploration

The Company has completed various geological mapping and surface sampling programs over several areas of mineralization on the Pulacayo Project starting in 2015 and continuing over the years into 2021. Recent exploration activities completed by the Company include a geological mapping and chip sample program completed in February 2020 for the Paca area and a San Leon Tunnel geological mapping and chip sample program completed in February-March of 2020. The Company also carried out a 3,277.4 m core drilling program in late 2019 and early 2020. A 545-meter drilling program at the Paca deposit was completed in October, 2020. A 940-meter drilling program was commenced at the eastern side of the Pulacayo deposit in an area known as "Pero" in December 2020, and completed in January 2021.

Drilling

Apogee commissioned a topographic survey of the Pulacayo and Paca areas in 2006 to provide a topographic base map for use in establishing road access, geological mapping and surface sampling, and locating drill collars and geophysical lines. A surface mapping and sampling program was done during 2005 and initially utilized the ASC preliminary geological maps. The company completed detailed surface mapping that covered all the exploration licenses. The sampling consisted mostly of rock chip samples taken from outcrops and accessible underground mine workings for a total of 549 samples. During 2006 Apogee also commissioned a detailed, three-dimensional digital model of the historic underground mine workings. The model was subsequently modified by Apogee to conform to the current datum and adjusted to align with the +1% incline grade of the San Leon tunnel. An induced polarization (IP) geophysical survey was carried out by Apogee between November and December 2007. A total of 29-line km of IP surveying was completed on the Pulacayo Project including seven lines at Pulacayo oriented north-south perpendicular to the east-west strike of the TVS and five similarly oriented survey lines at Paca.

Following the acquisition of the Pulacayo Project, Apogee initiated a diamond core exploration drill program that consisted of 19 holes. During 2007-2008 Apogee focused on the Paca deposit and completed 68 drill holes in two programs with 14 completed during November 2007 and 54 holes completed during 2008. Subsequent drilling occurred during June 2009, between November 2010 and December 2011, and between August 2011 and June 2012. Overall core recovery reported by Apogee exceeds 90% in most cases though proximity to old mine workings reduces the recovery potential due to associated bedrock instability. Particular attention was paid to the planning and documentation of drill holes. Planning is based on the logging and interpretation of geological cross sections generated by Apogee staff geologists. Drill hole coordinates are established from digital maps and surface drill hole collars are located on the ground by field geologists using a hand-held GPS receiver. The completed drill hole is later surveyed by company surveyors. Drill hole azimuth and inclination are established using a compass and clinometer. Collar coordinates for underground drilling are established by company surveyors and hole azimuth and inclination are set by transit. Downhole deviation is determined for both surface and underground holes at approximately 50 m intervals using down hole survey tools.

Work during 2015 included mapping, sampling, assays and metallurgical tests under Phase 2 of the exploration plan, planning for Phase 2 (geophysics, drilling and assays), and preparation and submittal of the permit application for Phase 2. The exploration centered on assessing the historical tailings piles and potential mineralized areas suggested by historical exploration. On February 2, 2015, the Company announced the assay results received January 22, 2015 from ALS Minerals Ltda., for samples obtained during the reconnaissance sampling program of tailings piles materials. The tailings piles are the remaining materials from processing ore, extracted from the Pulacayo mining district between approximately 1850 and 1950. The ore was processed by a mill on site which has since been dismantled.

A total of 12 tailings piles were identified at the start of the mapping and sampling program and a total of 299 samples from the 12 tailings piles were obtained. Samples were obtained at random locations on the top surface of those piles from small holes excavated with an excavator and systematically at 2-meter spacings in the walls (slopes) of the piles from hand dug or excavated trenches, all at depths of 1.2 to 1.5 meters. The samples were then preserved, stored, secured, and transported following industry standard methods. The assay program was performed by ALS Minerals Ltda. of Lima, Perú and included standard Quality Assurance and Quality Control (QA/QC) samples to enforce the validity of the results. The results indicate silver grades up to 1200 g/t, gold grades up to 7 g/t and indium grades up to 154.5 g/t. On September 10, 2015, the Company reported results from preliminary metallurgical test work conducted on samples collected from various tailing piles at the Pulacayo Project showing up to 64.39% silver recovery.

Surface mapping and sampling was completed during June to August 2015 on four potential mineralized areas (El Abra, Pero, Paca, and Pacamayo). The sampling included close spaced grab and chip samples obtained systematically where the trend of the mineralization is apparent or in historic mine adits and random spot sampling where the trend is not apparent. The samples were obtained through the aid of trenching to allow sampling of fresher material, where possible. The samples were then preserved, stored, secured, and transported following industry standard methods. The assay program was performed by ALS Minerals Ltda. and included standard QA/QC samples to enforce the validity of the results. On August 27, 2015 and September 9, 2015, the Company announced assay results of the first and second group of samples from the potential mineralized areas at the district exploration program. On September 18, 2015, the Company announced the assay results of the three Pacamayo samples where the silver grade was reported as more than 1,500 g/t. These samples have undergone reanalysis using the fire assay and gravimetric finish method which has a greater upper detection limit.

An exploration permit application was submitted during early 2015. The exploration permit would allow geophysical work to complete Phase 1 then after review of the Phase 1 information and previous exploration information and planning, completion of Phase 2.

Planning and budgeting for exploration to prove the planned stopes in the internally developed mining plans was completed. This exploration plan included in-mine drilling and mining new drivages to explore new areas, mapping of existing exposures and new drivages, sampling of existing exposures, new drivages, and drill core for laboratory analysis and metallurgical testing.

Summary of Modern Era Drilling

The Company initiated a 7-hole surface diamond drill program at the Paca deposit in September of 2019 and completed the program in October of 2019. Seven holes were completed for a total of 860 m. The Company also initiated surface drilling at the Pulacayo deposit in December of 2019 and concluded in February of 2020. A total of 3,277.4 meters of drilling was completed in 18 drillholes. Results of the 2019-2020 were included in the current mineral resource estimation program and contribute to 91,873 m of drilling combined for both deposits, the balance of which was completed by ASC and Apogee during the 2002 to 2012 period. Through 2021, 1,972m of drilling was completed at Pulacayo testing numerous induced polarization anomalies identified on the property.

Mineralization

Mineralization comprising the current Pulacayo deposit mineral resource estimate is defined by the extent of modern-era diamond core drilling along the TVS in the vicinity of historic underground workings. The workings extend over a strike length of approximately 2.7 km and to a vertical depth from surface of about 1 km. Modern drilling coverage is present for approximately 1.5 km of the known deposit strike length and extends to a vertical depth of approximately 550 m below surface.

The extent of mineralization comprising the current Paca deposit mineral resource estimate is defined by the extent of modern era diamond core drilling along a strike length of approximately 750 m and north-south extent of approximately 700 m. Limited underground exploratory workings accessible from the Esmeralda adit are present along approximately 100 m of the deposit's strike length in its central area.

Mineralization of economic interest at the Pulacayo deposit occurs within the Tertiary age Pulacayo volcanic dome complex that consists of older sedimentary rocks of the Silurian Quenhua Formation plus intruding andesitic volcanic rocks of the Rotchild and Megacristal units. Mineralization hosted by volcanic rocks can occur over tens of meters in thickness and typically consists of discrete veins plus stockworks of narrow veins and veinlets that occur within argillic alteration host rock envelopes. At deeper levels, high grade veins that are typically less than a few meters in width are hosted by sedimentary lithologies. Veins are commonly banded in texture and can contain semi-massive to massive sulphides. Primary minerals of economic importance at Pulacayo are tetrahedrite, galena and sphalerite, with additional silver sulfosalts and native silver also contributing to deposit silver grades. Mineralization is controlled by an east-west oriented normal fault system that links two northeast trending, steeply dipping, regional strike slip faults.

Mineralization of economic interest at the Paca deposit occurs in association with the same Tertiary age volcanic dome complex that produced the Pulacayo deposit and takes the form of thin veinlets, fracture fillings and disseminations hosted by altered volcaniclastic sedimentary lithologies and altered intermediate to felsic igneous lithologies. These occur in direct association with mineralized igneous or hydrothermal breccia zones. The intensity of argillic alteration is greatest in areas of highest concentrations of metallic mineral phases such as sphalerite, galena, argentite and tetrahedrite. Stratabound disseminated mineralization and breccia hosted mineralization predominate within the deposit, but discrete mineralized veins are also present locally. The deposit occurs at the contact between an andesitic intrusive complex and volcaniclastic sedimentary host lithologies. Bedded and cross-cutting breccia deposits that are important hosts to higher-grade mineralization commonly show close spatial association with the contact zone of the andesitic intrusion.

Deposit Type

The Pulacayo and Paca deposits are interpreted to be low to transitional sulphidation epithermal deposits that contain both precious and base metal mineralization.

Sampling

The core is initially examined by core technicians and all measurements are confirmed. Core is aligned and repositioned in the core box where possible and individual depth marks are recorded at 1 m intervals on the core box walls. Core technicians photograph all core, measure core recovery between core depth blocks, complete magnetic susceptibility readings and specific gravity measurements, and record the information on hard copy data record sheets. This information is initially entered into Excel digital spreadsheets and then incorporated into the project digital database. Drill site geologists then complete a written quick log of rock types along with a graphical strip log that illustrates the rock types. They subsequently complete a detailed written description of rock types, alteration styles and intensities, structural features, and mineralization features. The drill hole logs are drawn on paper cross sections when logging is completed and lithologies are graphically correlated from drill hole to drill hole. Mineralized intervals are marked for sampling by the logging geologist using colored grease pencils and the depths of the intervals and associated sample numbers are recorded on a hardcopy sample record sheet. All paper copy information for each hole, including quick logs, detailed logs, graphical logs, sample record sheets and assay certificates are secured together in a drill hole file folder to provide a complete archival record for each drill hole. Subsequent to logging and processing, down hole litho-coded intervals, sample intervals and drill hole collar and survey information are entered into digital spreadsheets and then incorporated into the project digital database. The sample intervals marked by the logging geologist are cut in half by the core technicians using a diamond saw. Friable core is cut in half with a knife. Each half core sample is assigned a unique sample tag and number and placed in a correspondingly numbered 6 mil plastic sample bag. A duplicate tag showing the same number is secured to the core box at the indicated sample interval. All sample intervals and corresponding numbers are recorded on a hardcopy sample data sheet and are subsequently entered into a digital spreadsheet for later incorporation in the project database. The secured 6 mil plastic sample bags are grouped in batches of 6 to 10 samples and secured in a larger plastic mesh bag in preparation for shipment to the laboratory.

Drill site procedures pertinent to the ASC drilling were confirmed by Apogee staff familiar with the ASC program to be generally similar to those employed by Apogee with respect to core logging and sampling. All ASC drill core samples were processed at the Oruro, Bolivia laboratory of ALS Chemex (formerly Bondar-Clegg), with those from the first phase of drilling being analyzed at ALS Chemex facilities in Vancouver, BC, Canada. In both instances, standard core preparation methods were used prior to elemental analysis.

Security of Samples

Apogee staff was responsible for transport of core boxes by pick-up truck from drill sites to the company's locked and secure core storage and logging facility located in the town of Pulacayo. The secured 6 mil plastic sample bags are grouped in batches of 6 to 10 samples and secured in a larger plastic mesh bag in preparation for shipment to the ALS Chemex preparation laboratory located in Oruro, Bolivia. All bagged samples remained in a locked storage facility until shipment to the laboratory. Samples are transported from the core storage area to the ALS Chemex facility by either Apogee personnel or a reputable commercial carrier. Sample shipment forms are used to list all samples in each shipment and laboratory personnel crosscheck samples received against this list and report any irregularities by fax or email to Apogee. Apogee did not encounter any substantial issues with respect to sample processing, delivery or security for the Pulacayo drilling programs. The transport and security of samples pertinent to the ASC drilling were confirmed by the then Apogee staff familiar with the ASC program to be generally similar to those employed by the following drilling programs. The security of Paca exploration samples followed the same procedures.

Sample Preparation, Analysis and Quality Assurance/Quality Control

All drill core samples from the ASC 2002 and 2003 drilling programs were processed at the Oruro, Bolivia laboratory of ALS Chemex, with those from the first phase of drilling being analyzed at ALS Chemex facilities in Vancouver, BC, Canada. In both instances, standard core preparation methods were used prior to elemental analysis. During the 2006 to 2012 Apogee drilling programs Apogee staff carried out immersion method specific gravity determinations but did not carry out any form of direct sample preparation or analytical work on project samples. Analytical work was completed by ALS Minerals Ltda. at its analytical facility in Lima, Peru after completion of sample preparation procedures at the ALS facility located in Oruro, Bolivia. ALS was at the time and remains an internationally accredited laboratory with National Association of Testing Authorities certification and also complies with standards of International Organization for Standardization (ISO) 9001:2000 and ISO 17025:1999. The laboratory utilizes industry standard analytical methodology and utilizes rigorous internal QA/QC procedures for self-testing. Samples from the ASC drilling programs carried out in 2002 and 2003 were also prepared and analyzed by ALS. However, after preparation at the facility in Oruro, Bolivia under the same protocols as for Apogee, analytical work was carried out at the company's laboratory in Vancouver, BC, Canada. This facility was fully accredited at the time and analytical protocols were the same as those described above for Apogee.

Apogee developed an internal QA/QC program that includes blind insertion of reference standards, blanks and duplicates in each analytical shipment that was used for the 2006 to 2012 drilling programs. A blank is inserted at the beginning of each sample batch, standards are inserted at random intervals throughout each batch of 50 samples and duplicates are analyzed at the end of each batch. All data gathered for QA/QC purposes is captured, sorted and retained in the QA/QC database. The QA/QC samples include commercial reference standards, an in-house standard, and commercial prepared blank materials. Coarse field blanks were also prepared by Apogee. Analysis of duplicate samples of quarter core is accommodated through their blind inclusion in the sample stream and analysis of duplicate prepared pulp splits are also requested for each batch. Apogee's protocol also includes a check sampling program based on analysis of sample splits at a second accredited laboratory. Bulk density measurements (specific gravity) were systematically collected by Apogee staff using standard water immersion methods and unsealed core samples. Characteristics of lithology and alteration were also recorded as part of the density program and all information was assembled in digital spreadsheets.

QA/QC procedures pertinent to the ASC 2002-2003 drilling programs were not documented. However, the first drilling program carried out by Apogee in 2006 was intended to confirm earlier ASC analytical data. Full QA/QC protocols instituted by Apogee were applied to this program and results of the Apogee re-drill program correlate well with those of ASC suggesting that acceptable standards were being met by ASC. Though preparation, analysis, and QA/QC procedures were not documented for the early ASC drilling on Paca, the results of the 2006 re-drill program and check sampling by Mercator during 2015 were comparable and suggests acceptable procedures were followed for the Paca deposit samples. Sampling from later drilling at Paca followed Apogee's QA/QC procedures described above. Bulk density measurements were also obtained.

The authors of the Pulacayo Technical Report visited the Pulacayo Project site on three occasions to support preparation of previous mineral resource estimates and one other visit was conducted in September of 2020 in support of the current mineral resource estimates and associated technical reporting. Results of data verification activities carried out by the authors of the Pulacayo Technical Report and site visits show that Pulacayo Project datasets are of industry standard quality and suitable to support mineral resource estimation programs.

Data Verification

Core sample records, lithologic logs, laboratory reports and associated drill hole information for all drill programs completed by Apogee and ASC were digitally compiled by Apogee staff. Information pertaining to the exploration history in the property area was also compiled by Apogee and was reviewed to assess consistency and validity of Apogee results. The digital drill hole records compiled by Apogee were checked in detail against the parameters (collar data, down hole survey values, hole depths, lithocodes) of the original hard copy source documents to assess consistency and accuracy. This was followed by review and validation of approximately 10% of the compiled core sample dataset against original source documents. Review of logging and sample records showed consistently good agreement between original records and digital database values. The drilling and sampling database records were further assessed through digital error identification methods available through the Gemcom-Surpac Version 6.2.1® software for such errors as sample record duplications, end of hole errors, survey and collar file inconsistencies and some potential lithocode file errors. The digital review and import of the manually checked datasets through Surpac provided a validated Microsoft Access® database that is considered to be acceptable for resource estimation.

Apogee hosted two site visits by experts for review of procedures and verification of conditions and work programs. The first during August 2011 included review of drilling program components, core check sampling, verification of drill hole locations, and discussion with Apogee staff and consultants. The experts determined that, to the extent reviewed during the visit, evidence of work programs carried out to date on the property is consistent with descriptions reported by the company and that procedures employed by Apogee staff are consistent with current industry standards and of good quality. The second site visit occurred during April 2012 and included additional review of on-going drilling and resource estimation program work pertaining to oxide zone mineralization. The experts determined their drill hole coordinates compared well with Apogee's coordinates and reasonable correlation exists between the original sample analyses and the check sample analyses.

The data verification performed for the Paca deposit was similar to that for the Pulacayo deposit described previously. Micon International Limited of Toronto, Canada, considered the field standard used by Apogee in its QA/QC program to be unacceptable and suggested use of a commercial standard or an in-house standard supported by industry best practices.

The authors of the Pulacayo Technical Report visited the Pulacayo Project site on three occasions to support preparation of previous mineral resource estimates and one other visit was conducted in September of 2020 in support of the current mineral resource estimates and associated technical reporting. Results of data verification activities carried out by the authors of the Pulacayo Technical Report and site visits show that Pulacayo Project datasets are of industry standard quality and suitable to support mineral resource estimation programs.

Mineral Processing and Metallurgical Testing

To date, four metallurgical test programs were completed by outside experts. These programs include: Resource Development Inc., Denver, USA in 2003, UTO (Universidad Técnica de Oruro), Oruro, La Paz, Bolivia in 2009, ED&ED Ingeniería y Servicios S.A.C. (which we refer to as "ED&ED"), Lima, Peru in 2011, and UTO and Maelgwyn Mineral Services Laboratory in South Africa during 2012. A fifth program was managed by Apogee where bulk samples from trial mining were sent to local concentrators.

During 2003, Resource Development Inc. tested 120 kg of core sample from two drill holes. Preliminary metallurgical test work was performed to evaluate the silver and sulfide base metals recovery potential including in-place densities, feed characterization, mineralogy, leaching, gravity concentration, and bench-scale open circuit and locked cycle tests (LCT's). Silver minerals were found not to be amenable to leaching by NaCN or gravity concentration. Grinding test data determined the time required to achieve a P80 of 150 # (104 μm) was 20 minutes. Bench scale open circuit flotation tests (OCT's) were performed using the flotation reagent suite developed for the San Cristobal Project. The overall silver recovery in the lead rougher concentrates was 97.1%. The lead cleaner concentrate recovered 2.8% of the weight, 84.6% of lead, 3.1% of zinc and 46.9% of silver. The lead concentrate assayed 60.8% Pb, 4.22% Zn and 8,440 g/t Ag. The zinc cleaner concentrate recovered 7.8% of weight, 1.3% of lead, 84.7% of zinc and 38.8% Ag. The concentrate assayed 0.324% Pb, 41.2% Zn and 2,463 g/t Ag. Large scale two cycle locked cycle flotation tests were performed using the process flowsheet similar to that developed for San Cristobal deposit. The lead concentrate assaying 62.2% Pb, 4.46% Zn and 10,891 g/t Ag, recovered 3.1% weight, 88.8% of lead, 3.9% of zinc and 63.4% of silver. The zinc concentrate assayed 61.5% Zn, 0.9% Pb and 3,303 g/t Ag, recovered 5% weight, 87.6% of zinc, 2.1% of lead and 31.3% of silver. The tailings were very difficult to settle due to high proportions of clay in the ore, which will impact the process flow sheet and overall plant design. The lead and zinc third cleaner concentrates were analyzed for impurities and found that penalties may be incurred on the concentrates for several impurities.

UTO conducted a metallurgical test program during 2009 on three samples comprising comminution (only Bond Ball Work Index), OCT's, LCT's, OCT tailings (non-float) size by size analyses, and OCT tailings (non-float) sedimentation tests. Clay mineralogy studies were not carried out to determine the presence of clays that may produce very fine slimes though during the test work, slimes were produced affecting the flotation performance, settling of tailings, and flotation pulp rheology. The samples were drill cores composited to represent a higher grade, a medium grade, and a lower grade. Comminution was evaluated using the Bond Ball Mill Work Index test and categorized the samples as medium to hard. Abrasion index, crushing work index, and rod work index tests were not performed. Specific gravity tests were performed. Flotation test work focused on lead and silver recovery using both batch open circuit and closed circuit flotation tests. Locked cycle tests of the high-grade sample indicated that conventional selective lead-silver and zinc-silver flotation techniques recovered 56% of the silver in the lead concentrate and 27% of the silver in the zinc concentrate with lead recovery of 79% and zinc recovery of 81%. Silver grades were 6,620 g/t in the lead concentrate and 2,010 g/t in the zinc concentrate. LCT test results of the medium grade sample indicated that it is possible to recover almost 34% of the silver in the lead concentrate and 50% of the silver in the zinc concentrate, with lead and zinc grades at 51% and 58%, lead and zinc recoveries at 74% and 83%, and silver grades at 6,220 g/t and 2,990 g/t. LCT test results of the low-grade sample indicated that it is possible to recover almost 30% of the silver in the lead concentrate and 21% of the silver in the zinc concentrate, with lead and zinc grades at 51% and 58%, lead and zinc recoveries at 74% and 83%, and silver grades at 6,220 g/t and 2,990 g/t, respectively. The results seem to be reasonable and in accordance with expectations from the mineralogy of the ore. These results constitute the design basis for the flow sheet. Full OCT's of sulphide minerals flotation were conducted initially on each sample as a proof of concept of the overall circuit and to establish a workable set of flotation conditions and reagents. These tests demonstrated that sulphide flotation to saleable lead and zinc concentrates at acceptable (for batch tests) recoveries was possible.

During 2011, the laboratory facility of ED&ED, performed a series of flotation tests and contracted mineralogical analyses on a high grade and low-grade sample. The initial ED&ED flotation test work was not successful then after pre-conditioning the samples with activated carbon and subsequent differential flotation, was moderately successful. The minerals present included sphalerite, galena, pyrite and quartzite gangue with galena-sphalerite assemblages (intertwined specimens) present to some extent. Twelve (12) OCT's were conducted on each of the samples to confirm the previous flotation results by UTO and to evaluate the effect of flotation response at finer grind sizes as seen in the flowcharts. The flotation tests carried out on the high-grade samples indicated that it is possible to obtain commercial lead and zinc concentrates with grades of lead and zinc of 42.1% and 43%, respectively. The concentration of silver in the lead and zinc concentrates were reported as 7,010 g/t and 198.2 g/t, respectively. The straightforward conventional selective lead-silver and zinc-silver flotation techniques after carbon pre-treatment are able to recover 85.7% of silver in the lead concentrate (with a mass pull of 3.1%) and 2.93% of silver in the zinc concentrate (with a mass pull of 3.75%). The lead and zinc recoveries are estimated as 80% and 77.8%, respectively. The flotation tests, carried out on the low-grade samples indicated that it is possible to obtain commercial lead and zinc concentrates with grades of lead and zinc of 41% and 43.1%, respectively. The concentration of silver in the lead and zinc concentrates were reported as 6,734 g/t and 207 g/t, respectively. The straightforward conventional selective lead-silver and zinc-silver flotation techniques after carbon pre-treatment are able to recover 74% of silver in the lead concentrate (with a mass pull of 1.95%) and 3.27% of silver in the zinc concentrate (with a mass pull of 2.8%). The lead and zinc recoveries are estimated as 77.6% and 71.9%, respectively. In overall, better flotation (open circuit tests) performances are obtained at a grind size of P80 of 74 μm. Locked cycle tests at this grind size will be necessary to confirm these results. A set of paste thickening tests were run on dry samples of the flotation test (tailings) to investigate the performance of the FLSmidth Deep Cone Paste thickening technology. Screening flocculent tests were carried out. Anionic flocculent (Floenger PHP 50 Plus) was selected to improve sedimentation performance based on settling rates and observed visual supernatant clarity. Experience has shown that it is difficult to scale paste flow characteristics from small-scale tests to full-scale pipeline conditions, pilot-scale pumping tests are usually necessary. The lab flotation concentrates (open circuit tests) were assayed to determine the deleterious elements in the concentrate and for use in the NSR calculations and included mineralogical analyses. The results showed that the lead concentrate assayed 47.2% Pb and 6,273 g/t Ag with 1.3% Cu, 1.45% As and 1.23% Sb. The zinc concentrate assayed 53.8% Zn with negligible copper, arsenic or antimony. The lead, silver and zinc concentrate grades are in agreement with the LCT carried out before. Concentrations of deleterious elements appear below typical smelter penalty thresholds, with arsenic appearing as the principal penalty element.

During 2012, UTO conducted further metallurgical test work including a single collective flotation test, a series of open circuit differential flotation tests (with a de-sliming step), a single locked cycle flotation test (with de-sliming step), and PORCO flow sheet testing. This test work was designed to explore the flotation response of the ore to conventional differential flotation and to establish the operating conditions, reagent scheme, and consumptions. The sample was prepared and provided by Apogee (ASL) and consisted of a bulk composite sample from drill cores with grain sizes up to 76.2 mm (3 inches). The first exploratory test indicated that silver recovery to bulk concentrate is about 72%, while the lead and zinc recoveries are approximately 66% and 78% respectively. The floating fraction accounted for about 13%, the slimes fraction 18%, and the rest is lost as final tailings. Lead and silver losses are up to 23% and 13%, respectively. The open batch flotation tests indicated that lead recovery is between 48% and 54%, while zinc recovery is in the range from 50.1% to 72%. Total silver recovery to both lead and zinc concentrates is between 30% and 68%. Lead concentrate grades range from 33.5% to 59%, zinc concentrate grades range from 49% and 55%. Similarly, silver grades in both concentrates range from 9,875 g/t to 15,333 g/t. A single LCT, a repetitive batch used to simulate a continuous circuit where all the intermediate material added to the appropriate location in the flowsheet, was conducted to produce a metallurgical projection of the sample tested and to assess if the flowsheet and reagent suite is stable. A good locked cycle test typically achieves steady state over the last three cycles. Steady state implies both stability and mass conservation. Stability implies constancy. It was not indicated whether the test reached stability or whether mass conservation was achieved. Assuming that steady state was reached, the results indicated that lead and zinc recoveries were 60.1% and 76.5%, respectively. Lead concentrate assayed 11,114 g/t Ag, 49.1% Pb and 4.81% Zn. Additionally, the metal values in the zinc concentrate were 2,220 g/t Ag, 2.29% Pb and 48.6% Zn. Concentrates account for about 2.9% w/w of the feed (0.81% lead and 2.1% zinc). Silver metal loss in the slimes is as high as in the tailings. Lead and silver losses in the final tails are 23.1% and 9.12% respectively. The PORCO flowsheet is basically a bulk flotation followed by lead and zinc flotation, this processing route should be carried out at high pH (12.2) intended to depress pyrite at the outset. However, the Pulacayo ore did not respond well mainly because of lead and silver selectivity issues and high consumption of acid (H2SO4) to drop the pH to a level suitable for lead flotation after the bulk stage.

Maelgwyn Mineral Services Africa carried out laboratory flotation optimization test work on ore samples from the Pulacayo Project during 2012. The objectives of the work were to: (i) test the flotation conditions supplied by Apogee on the core samples to determine the metal recoveries and grades achievable by differential flotation of the Pb and Zn minerals; (ii) to optimize the flotation conditions for effective differential of the Pb and Zn minerals and to achieve saleable grades of Pb and Zn concentrates; and (iii) to perform locked cycle testing of the optimized flotation conditions using selected variability core samples. Laboratory rod milling curves were produced for all the samples and found that the milling times required for the samples indicated a high degree of variability in hardness between the sample types. Flotation tests included 65 OCT's (exploratory test work) and four locked cycle flotation tests. In summary, the locked cycle tests yielded Pb concentrates of 55-69% Pb at recoveries between 88% and 93% and Zn concentrates of 37% to 56% Zn at recoveries of 79% to 90% with a large variation in head grade from 1.5% Pb to 4.3% Pb. The silver recoveries ranged between 68% and 94% with a variation in head grade of between 136 g/t Ag and 375 g/t Ag.

The test mining between November 2011 and May 2013 produced 12,550 tons of ore that were used in a toll milling program to evaluate ore processing. The ore was hauled by truck to four concentrators - Tatasi, Fedecomin, La Estrella, and Zabaleta. The Zabaleta concentrator attained the best recoveries for which the results are presented in the table below.

PULACAYO DEPOSIT ZABALETA TOLL MILLING RESULTS

Only one series of metallurgical tests were performed on samples from the Paca deposit. The tests were completed on three samples composited from drill cores and included feed characterization, leaching, flotation and gravity tests, in-place bulk density determination, and mineralogy. Study of the three composite samples found the silver grade varied from 44.5 g/t Ag to 228.6 g/t Ag, lead minerals 0.56% Pb to 0.8% Pb), and zinc minerals 0.05% Zn to 0.41% Zn). The other sulfide minerals identified were sulphosalts and chalcocite. Coarse native silver was detected in one of the samples. The silver minerals were amenable to cyanide leaching for most of the composite samples (i.e. 28% to 82% Ag extraction) however, extraction of silver was size dependent and improved with fineness-of-size. The lime consumption in leach varied from 0.8 to 2.4 kg/t. The NaCN consumption was dependent on both ore type and particle size, increasing with fineness of a particular size and in general, averaged ± 1.5 kg/t. Due to the presence of coarse native silver, the silver leaching was not completed in 120 hours, hence, the data was extrapolated to 240 hours leach time to project anticipated silver recovery and indicated that over 90% of silver could potentially be recovered at fine particle size for two of the three composites. Assay of the final pregnant solution from selected tests found measurable quantities of gold, hence, it is reasonable to conclude that gold is present in those samples. Some of the copper minerals present in the samples are also readily soluble in cyanide. Differential lead/zinc flotation process recovered over 90% of silver in the combined lead and zinc concentrate for the composite assaying 228.6 g/t Ag. The flotation process shows promise of recovering silver. However, the flotation process did not recover acceptable silver values from the other composites. The gravity concentration process did not concentrate silver in the gravity concentrate, hence, it cannot be used alone as a process for recovering silver minerals. The average density was ± 2.2 gm/cc for the samples tested, but the in-place bulk densities were extremely variable for one composite (i.e., 1.79 and 2.58 gm/cc). In summary, the preliminary results were encouraging to warrant additional drilling and metallurgical testing.

Mining

Mineralization is found from the surface to at least 1,000 m depth at the Pulacayo deposit thus both surface and underground mining methods are likely. It is envisioned that surface mining will recover the oxidized ore and some sulphide ore to an elevation below which a crown pillar will be left and below which underground mining methods would start. Mineralization at the Paca deposit is found from the surface to approximately 60 m depth for the mantos-style mineralization and from approximately 10 m to 240m depth for the stockwork and vein style mineralization. Thus, it is anticipated mining will be mostly by surface methods.

Trial mining was conducted between November 2011 and May 2013 at the Pulacayo deposit. The trial mining was done to obtain geotechnical information, better understand mining dilution, obtain a large sample for process testing, and train the workforce. The mining methods included jack leg drill and blast with tracked haulage for development and drill and blast with trackless haulage for production by the shrinkage and reusing stoping methods. The haulage way was advanced and three stopes were mined. The trial mining produced 12,550 tons of ore.

Mineral Resource Estimates and Reserves

The current Pulacayo Project mineral resource estimates for the Pulacayo and Paca deposits has been extracted or summarized from the 2022 Pulacayo Technical Report.

The definition of mineral resources and associated mineral resource categories used in this TRS are based on the Canadian National Instrument 43-101 (NI 43-101) standards and defined in the CIM Definition Standards for Mineral Resources and Mineral Reserves (adopted May 2014). Mineral Resources are classified based on the density of the drill hole data, the continuity of the mineralized zones, and determining reasonable prospects for economic extraction. The mineral resource classification used in this TRS complies with the mineral resource definitions and disclosure standards used by the SEC in Regulation S-K 1300. All assumptions, metal threshold parameters, and deposit modeling methodologies associated with the Pulacayo and Paca deposits mineral resource estimates are presented in Section 11 of this TRS.

The mineral resource estimate for the Pulacayo Project consists of separate contributing mineral resource estimates for the Pulacayo and Paca deposits and was prepared and reviewed by report authors and Qualified Persons M. Harrington, P.Geo. and M. Cullen, M.Sc. P.Geo., both of Mercator. Mr. Harrington is responsible for the Pulacayo Project mineral resource estimates both with an effective date of October 13, 2020. Mercator has confirmed that the mineral resource estimates remain current as of December 31, 2021.  Geovia Surpac ® Version 2020 was used to create the Pulacayo Project block models and associated geological and grade solids, and to interpolate silver-zinc-lead grades. A tabulation of the mineral resources for the Pulacayo Project is presented below in Table 1.2.

Report author M. Harrington concludes that the mineral resource estimates for the Pulacayo Project (Pulacayo and Paca deposits) have reasonable prospects for economic extraction based on the following technical and economic factors:

Pit Constrained mineral resources were defined for each deposit within optimized pit shells developed using Geovia Whittle software utilizing the Pseudoflow algorithm;

Mineral Resource Category Parameters

Definitions of mineral resources and associated mineral resource categories used in this report are those recognized under S-K 1300 as well as those recognized under NI 43-101 and set out in the CIM Standards, 2014. Only Inferred and Indicated categories have been assigned to the Pulacayo deposit. The mineral resources determined under S-K 1300 and NI 43-101 are the same.

Several factors were considered in defining resource categories, including drill hole spacing, geological interpretations and number of informing assay composites and average distance of assay composites to block centroids. Specific definition parameters for each resource category applied in the current estimate are set out below.

Measured Resource: No interpolated resource blocks were assigned to this category.

Indicated Resource: Indicated mineral resources are defined as all blocks with interpolated silver grades from the first or second interpolation passes that meet the specified Pit Constrained or Out of Pit cut-off grades.

Inferred Resources: Inferred mineral resources are defined as all blocks with interpolated silver grades from the first, second, and third interpolation passes that were not previously assigned to the Indicated category and meet the specified Pit Constrained or Out of Pit cut-off grades.

Application of the selected mineral resource categorization parameters specified above defined distribution of Indicated and Inferred mineral resource estimate blocks within the block model. To eliminate isolated and irregular category assignment artifacts, the peripheral limits of blocks in close proximity to each other that share the same category designation and demonstrate reasonable continuity were wireframed and developed into discrete solid models. All blocks within these "category" solid models were re-classified to match that model's designation. This process resulted in more continuous zones of each mineral resource estimate category and limited occurrences of orphaned blocks of one category as imbedded patches in other category domains.

Pulacayo Deposit

Mineral Resource Estimate

Block grade, block density and block volume parameters for the Pulacayo deposit were estimated using methods described in preceding sections of this report. Subsequent application of mineral resource category parameters resulted in the Pulacayo deposit mineral resource estimate presented below in table below. Results are presented in accordance with NI-43-101 and the CIM, as well as in accordance of S-K 1300. Mineral resources are calculated in situ.

**Notes:

Mineral resources were prepared in accordance with S-K 1300 as well as NI 43-101, the CIM Definition Standards (2014) CIM MRMR Best Practice Guidelines (2019).

*Ag Eq. = Silver Equivalent (Recovered) = (Ag g/t*89.2%)+((Pb%*(US$0.95/lb. Pb/14.583 Troy oz./lb./US$17 per Troy oz. Ag)*(10,000*91.9%))+((Zn%*(US$1.16/lb. Zn/14.583 Troy oz./lb./US$17 per Troy oz. Ag)*(10,000*82.9%)). Sulphide zone metal recoveries of 89.2% for Ag, 91.9% for Pb, and 82.9% for Zn were used in the Silver Equivalent (Recovered) equation and reflect metallurgical testing results disclosed previously for the Pulacayo deposit. A metal recovery of 80% Ag was used for oxide zone mineral resources.

Metal prices of US$17/oz Ag, US$0.95/lb. Pb, and US$1.16 Zn apply. A currency exchange rate of $1.00 to US$0.75 applies.

Pit Constrained mineral resources are defined within an optimized pit shell with average pit slope angles of 45⁰. The Pulacayo deposit mineral resource estimate was optimized at a 12.3:1 strip ratio.

Base-case sulfide zone pit optimization parameters include mining at US$2.00 per tonne; combined processing and G&A at US$12.50 per tonne processed; and haulage at US$0.50 per tonne.

Base-case oxide zone pit optimization parameters include mining at US$2.00 per tonne; combined processing and G&A at US$23.50 per tonne processed; and haulage at US$0.50 per tonne.

Pit Constrained sulphide zone mineral resources are reported at a cut-off grade of 30 g/t Ag Eq. within the optimized pit shell and Pit Constrained oxide zone mineral resources are reported at a cut-off grade of 50 g/t Ag within the optimized pit shell. Cut-off grades reflect total operating costs used in pit optimization and are considered to define reasonable prospects for eventual economic extraction by open pit mining methods.

Out of Pit mineral resources are external to the optimized pit shell and are reported at a cut-off grade of 100 g/t Ag Eq. They are considered to have reasonable prospects for eventual economic extraction using conventional underground methods such as long hole stoping based on a mining cost of $35 per tonne and processing and G&A cost of $20 per tonne processed.

Combined Pit Constrained and Out of Pit mineral resources is the tonnage-weighted average summation of Pit Constrained and Out of Pit Pulacayo mineral resources.

Mineral resources were estimated using Ordinary Kriging methods applied to 1 m downhole assay composites capped at 2,300 g/t Ag, 13% Pb and 15% Zn.

Bulk density was interpolated using Inverse Distance methods.

Mineral resources may be materially affected by environmental, permitting, legal, title, taxation, sociopolitical, marketing, or other relevant issues.

Mineral resource tonnages have been rounded to the nearest 5,000; totals may vary due to rounding.

Pit Constrained sulphide mineral resources are reported at a cut-off value of 30 g/t Ag Eq. within the optimized pit shell and Pit Constrained oxide mineral resources are reported at a cut-off value of 50 g/t Ag within the optimized pit shell. Cut-off grades reflect total operating costs and are considered to reflect reasonable prospects for eventual economic extraction using conventional open pit mining methods. Sulphide zone pit optimization parameters include mining at US$2.00 per tonne, combined processing and G&A at US$12.50 per tonne processed, and haulage at US$0.50 per tonne processed. Oxide zone pit optimization parameters include mining at US$2.00 per tonne, combined processing and G&A at US$23.50 per tonne processed, and haulage at US$0.50 per tonne processed. Metal prices of US$17/oz silver, US$0.95/lb lead, and US$1.16/lb zinc were used and metal recoveries of 89.2% silver, 91.9% lead, and 82.9% zinc were used for sulphide zone mineral resources and 80% silver for oxide zone mineral resources. Optimization was constrained to an elevation of 4000 asl (maximum depth of approximately 400 m below surface). The optimized pit supports a 12.3:1 strip ratio with average pit slopes of 45°.

Out of Pit mineral resources are reported external to the optimized pit shell at a cut-off grade of 100 g/t Ag Eg. They are considered to have reasonable prospects for eventual economic extraction using conventional underground mining methods such as long hole stoping based on a mining cost of US$35 per tonne and processing and G&A cost of $20.00 per tonne processed.

Validation of Mineral Resource Models

Results of block modeling were reviewed in three dimensions and compared on a section by section basis with associated drill hole data. Block grade distribution was shown to have acceptable correlation with the grade distribution of the underlying drill hole data. Silver, lead, and zinc grade descriptive statistics, presented in the table below, were calculated for all interpolated blocks at a zero cut-off value and were compared to the values of the combined assay composite population (100 g/t Ag domain and 45 g/t Ag Eq. domain). Average grades compare favorably between the composite and block populations. As expected, the large block grade population is characterized by lower coefficient of variation, standard deviation and variance values than those of the assay composite population.