El Nino Releases Phase 1 Metallurgical Results for the Murray Brook
Base Metal Deposit, Bathurst Mining Camp, New Brunswick
VANCOUVER,
Jan. 16, 2013 /CNW/ - El Nino
Ventures Inc. ("ELN" and the "Company") (TSX.V: ELN; OTCQX: ELNOF
Frankfurt: E7Q) is pleased to announce the results from Phase 1
metallurgical testwork commissioned by its partner, Votorantim
Metals Canada Inc. (Votorantim), on samples from the Murray Brook
polymetallic deposit, located in the Bathurst Mining Camp, New Brunswick. The purpose of the testwork was
to investigate flotation options for sequential recovery of copper,
lead and zinc concentrates from Murray Brook feed.
The metallurgical testwork was completed at RPC
Science & Engineering Laboratories (RPC) in Fredericton (New
Brunswick), under the direction of metallurgists Ross
Gilders and Leo Cheung.
Further information on RPC may be found at the laboratories'
website at http://www.rpc.ca
Results
Testwork was completed on bulk drill core samples from the Eastern
Zone and from the Western Zone of the Murray Brook deposit (Figure
1; Table 1). The test program consisted of sample preparation
and compositing, characterization, and batch flotation tests
followed by locked cycle tests on a composite sample. The composite
sample head grade for the testwork is similar to the grade of the
current high confidence Measured resources for Murray Brook.
Locked cycle tests by RPC successfully produced
individual copper, lead and zinc concentrates with the following
recoveries and grades (Table 2):
- Recoveries of 51.4% copper, 1.7% zinc, 4.5% lead, and 12.5 %
silver in a copper concentrate grading 17.5% copper, 6.0%
zinc, 6.2% lead, and 591 g/t silver;
- Recoveries of 36.6% lead, 7.2% copper, 1.4% zinc, and 17.5%
silver in a lead concentrate grading 50.3% lead, 2.4%
copper, 5.3% zinc, and 833 g/t silver; and
- Recoveries of 88.8% zinc, 15.8% copper, 8.3% lead and 25.3%
silver in a zinc concentrate grading 53.8% zinc, 0.5%
copper, 1.1% lead, 95 g/t silver.
A copy of the report is available for viewing on
the Company's website. Additional metallurgical work has been
commissioned by Votorantim and RPC, which involves completing
expanded and extended locked cycle tests to optimize copper, lead
and precious metal recoveries in support of a planned Preliminary
Economic Assessment in 2013.
Harry Barr,
Chairman & CEO states: "The results of the Phase 1
metallurgical testwork on Murray Brook are encouraging,
particularly the 89% zinc recovery combined with good silver
recovery. These initial metallurgical results plus the results of
18,500 metres of drilling completed since 2011 and the resource
estimation of February 2012, confirm
the robustness of Murray Brook as this well-located project is
steadily advancing towards the planned completion of a Preliminary
Economic Assessment in H1 2013."
Sampling
The sample materials were derived from three HQ
size drill cores (Table 1). Hole MB-2012-121 was drilled in
the Eastern Zone, the shallower and more copper-rich of the two
massive sulfide zones at Murray Brook. Holes MB-2012-124 and
MB-2012-132 were drilled in the deeper, more zinc-lead-precious
metal rich Western Zone. (Description and assay results for each of
the three holes are provided in ELN press releases dated
July 30, August 14, August 28,
2012). The drill core was logged, split, sampled and shipped
to RPC. Intervals of potential secondary mineralization and
fracturing were sampled separately. In total 3226 kg of
material was delivered to RPC for testwork.
Figure 1. Massive Sulfide Thickness, 10 metre
contours
(http://www.elninoventures.com/s/NewsReleases.asp?ReportID=565334):
Colour contour map of Murray Brook showing the location of the
Eastern Zone and the Western Zone plus the surface trace of the
massive sulfides. Metallurgical hole MB-2012-121 was drilled in the
Eastern Zone. Metallurgical holes MB-2012-124 and -132 were
drilled in the Western Zone.
Table 1. Drill Core Sample Material for
the metallurgical Testwork on Murray Brook
Description |
Zone |
Sample |
Mass |
Mass
Dist. |
Assays/Values |
Distribution
Ratio% |
g |
% |
Cu% |
Pb% |
Zn% |
Ag (g/t) |
Au (g/t) |
Cu |
Pb |
Zn |
Ag |
Au |
MB-2012-121 |
Eastern |
bottom |
15908 |
33.3 |
0.5 |
1.0 |
1.9 |
42 |
0.906 |
60 |
27 |
148 |
31 |
52 |
MB-2012-124 |
Western |
bottom |
15908 |
33.3 |
0.2 |
0.8 |
2.9 |
35 |
0.263 |
23 |
24 |
28.4 |
26 |
15 |
MB-2012-132 |
Western |
whole |
15908 |
33.3 |
0.1 |
1.7 |
5.5 |
59 |
0.591 |
17.0 |
49 |
53.2 |
435 |
34 |
Summary results:
average or total as appropriate |
47724 |
100 |
0.3 |
1.2 |
3.4 |
45 |
0.590 |
100 |
100 |
100 |
100 |
100 |
Measured* |
both |
average |
|
|
0.3 |
1.2 |
3.5 |
44 |
0.500 |
|
|
|
|
|
Meas+Ind* |
both |
average |
|
|
0.4 |
1.0 |
2.6 |
39 |
0.510 |
|
|
|
|
|
*Grade of current Measured and Measured + Indicated resources
(see Technical Report on www.elnventures.com)
Table 2.Assay and Recovery Results of
Locked Cycle Tests for Murray Brook
Description |
Sample/Circuit |
Assays |
Recovery% |
Cu% |
Pb% |
Zn% |
Ag (g/t) |
Au (g/t) |
Cu |
Pb |
Zn |
Ag |
Au |
Feed Grade |
blend of 3 holes |
0.27 |
1.15 |
3.42 |
45 |
0.590 |
|
|
|
|
|
Cu Concentrate |
final |
17.45 |
6.16 |
6.04 |
591 |
1.051 |
51.4 |
4.5 |
1.7 |
12.5 |
2 |
Pb Concentrate |
final |
2.40 |
50.30 |
5.27 |
833 |
0.923 |
7.2 |
36.6 |
1.4 |
17.5 |
1.8 |
Zn Concentrate |
final |
0.48 |
1.08 |
53.78 |
95 |
0.360 |
15.8 |
8.3 |
88.8 |
25.3 |
5.5 |
Grindability
Tests
Composite samples for each of the three Murray Brook drill holes
were submitted for grindability test work. Rod Mill
Grindability Indices for the Murray Brook bulk sample materials
averaged 14.6 kWh/t with a hardness percentile of 55%. Bond
Ball Mill Grindability Indices averaged 10.7 kWh/t with a hardness
percentile of 10%. These data suggest that Murray Brook
mineralization is of moderate hardness for a rod mill and lower
hardness for a ball mill.
Mineralogy
SEM-EDS mineralogical studies of the overall composite sample and
each individual drill core by RPC indicate that sphalerite and
galena occur as interstitial grains, inclusions, veinlets and
attachments to pyrite. Chalcopyrite occurs as interstitial
grains to pyrite. Chalcopyrite is less common hole
MB-2012-132, consistent with the lower copper grades in the Western
Zone. Covellite is present in MB-2012-124. Generally,
the principal silver mineral is tetrahedrite. The sulfide
grains are mainly 20 µm in size. However, sphalerite grains
50-100 µm in size are present interstitial to pyrite grains.
Flotation
Primary bulk sulfide rougher floats were carried out to estimate
flotation performance. The reagent regime included 400 g/t
CuSO4, pH 10.0-10.5, 33.3 g/t 3418A, 10g/t PAX, 15 g/t
MIBC and 11 minutes total at 1250 rpm. Rougher target
liberation grind size was established to be D80 of ~30 µm.
Initial testwork found that flotation performance was adversely
affected by the presence of secondary (oxidized) material. This
latter material therefore was excluded from the overall composite
sample used in locked cycle testing.
Next Steps
Additional metallurgical testwork is planned to be carried out by
RPC in early 2013. The results will be reported in a planned
Preliminary Economic Assessment to be completed in Q1 2013. The
additional testwork will focus on optimizing copper, lead and
precious metal recoveries, in part through processing of larger
samples in bigger equipment. An expanded metallurgical test
program, including pilot plant testing, may be warranted if PEA
studies are positive.
Qualified Persons Statement
This news release has been reviewed and approved for technical
content by Ali Hassanalizadeh M.Sc.
P.Geo., a qualified Person under the provisions of National
Instrument 43‐101.
About El Niño Ventures Inc. Bathurst
Projects
El Niño Ventures Inc. has two active projects in the Bathurst
Mining Camp;
1. Murray Brook Project
The Murray Brook project is a polymetallic,
massive sulfide deposit and is the fifth largest deposit
discovered to date in the Bathurst Mining Camp, New Brunswick. The Murray Brook property
is located 60 km west of Bathurst. It is supported by excellent
infrastructure, including paved roads, grid electricity and
communities to provide goods, services and skilled
labour.
A $3 million
exploration budget was approved for the 2012 exploration program.
It included $2.5 million for drilling
to bring resources into the measured category at the Murray Brook
deposit and $500,000 for exploration
of the Murray Brook and Camel Back properties, both of which are
covered by the option agreement with Murray Brook Minerals. To
date, more than 28,000 metres of drilling has been completed with
encouraging results. In February
2012, an NI43-101 compliant resource estimation was
announced (see news release. The technical report is filed on
SEDAR.com and also available on ELN's website. An updated NI43‐101
mineral resource estimation and metallurgical test results are
slated for completion in the first quarter of 2013. Results of
these will be incorporated in a Preliminary Economic Assessment
"PEA" that is slated for completion in the first quarter of
2013.
ELN and VMC currently own 70% of the project,
of which 35% is held by each of the two parties. Under a
purchase agreement signed by VMC on August
28, 2012 with MBM and Murray Brook Resources Inc.
(collectively the owners), VMC acquired the right to purchase the
additional 30% of the Murray Brook Project from the owners. ELN
has been provided the option to purchase an additional 15% in the
project for a combined total of 50% (35% +15%).
Although the terms of the Participation
Agreement provided for a three-year period to earn the initial 50%
and two years to earn the additional 20%, ELN and VMC completed
their earn-in in less than 18 months.
2. Bathurst Option Joint Venture Project
(BOJV)
Consists of an initial 4,712 claims in the Tri‐Party Agreement with
Xstrata & VM Canada whereby VM Canada may incur exploration
expenditures of $10 million over a
period of 5 years to earn a 50% interest. VM Canada may further
increase its interest to 70% by spending an additional $10 million over 2 years.
Votorantim Metals Canada Inc.
Statement
Technical details in this news release were provided by Votorantim
whose professional geologists conduct operations consistent with
mineral industry best practices. Votorantim accepts no
responsibility for this news release.
About Votorantim Metals Canada
Votorantim Metals Canada Inc. is a subsidiary of Votorantim Metais,
a company that is part of the Votorantim Group that was founded in
Brazil in 1918. The Votorantim
Group operates in twenty countries and has over 40,000 employees.
Votorantim Metais is the largest electrolytic nickel producer in
Latin America and one of the
world's leaders in the production of zinc, aluminum and
nickel. Votorantim Canada Metals Inc. in conjunction
with Xstrata Zinc and El Nino Ventures is operator of the Bathurst
Option and Joint Venture which is actively exploring for base metal
deposits within the Bathurst Mining Camp.
About El Nino Ventures Inc.
El Niño Ventures Inc. is an international
exploration company, focused on exploring for lead, zinc, copper,
gold and silver in New Brunswick,
Canada and copper in the Democratic Republic of Congo ("DRC").
On Behalf of the Board of Directors
(signed)
Harry Barr
Chairman & CEO
El Niño Ventures Inc.
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Regulation Services Provider (as that term is defined in the
policies of the TSX Venture Exchange) accepts responsibility for
the adequacy or accuracy of this release.
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SOURCE El Nino Ventures Inc.