TSXV: UVN
CALGARY, Dec. 20, 2012 /CNW/ - In September 2012 Uravan Minerals Inc. ("Uravan ")
completed an exploration program on its Halliday project,
Athabasca Basin1,
Northern Saskatchewan [map link].
The technical program consisted of five (5) diamond drill-holes
(HL-01, -02, -03, -05 and -06)2 totaling 4,836 meters
drilled and an infill-surface geochemical sampling program [press
release September 6, 2012].
Drill-holes were positioned to test the
potential occurrence of uranium mineralization at depth along a
prominent 5 kilometre long, east-west trending corridor. This
corridor was defined by an electromagnetic (EM) geophysical
conductor (Conductor A), which cross-cuts a prominent linear
magnetic low, and was supported by a concordant distribution of
anomalous surface geochemical signatures3 [map
link].
All drill-holes were surveyed for anomalous
radioactivity (suggesting potential uranium mineralization) using a
Mount Sopris Triple Gamma (2GHF-1000) down-hole geophysical probe.
The results from these down-hole radiometric surveys disclosed
anomalous radioactivity (400cps to 1200cps) in most drill-holes,
occurring predominantly in the underlying structurally disrupted
and hydrothermally altered basement rocks (granites and
metasediments). Based on the triple-gamma probe data, no
economic uranium mineralization was encountered during this drill
program. All zones of anomalous radioactivity were systematically
sampled and analyzed for total uranium content. The most
significant intersections are indicated in the table below.
HoleID |
Unconformity |
From (m) |
To (m) |
Thkness (m) |
U (ppm) |
Rock Type |
HL-003 |
801.83 |
845.90 |
846.55 |
0.65 |
486.6 |
Basement |
HL-003 |
801.83 |
816.40 |
816.70 |
0.30 |
177.1 |
Basement |
HL-003 |
801.83 |
829.20 |
829.49 |
0.29 |
198.4 |
Basement |
HL-003 |
801.83 |
832.64 |
832.80 |
0.16 |
199.1 |
Basement |
HL-005 |
808.90 |
816.35 |
816.57 |
0.22 |
732.6 |
Basement |
To help relate the geochemical signals coming
from the basement, through the unconformity, and then vertically
through the Athabasca sandstone
(MF) to the surface environment (soils and trees), all drill-cores
were systematically sampled. A total of 629 core samples
(sandstone, fractures and basement rocks) were collected and then
analyzed at Acme Labs in Vancouver,
BC using whole-rock (Aqua-Regia) geochemical techniques and
at the Queen's Facility for Isotope Research5 (QFIR) at
Queen's University using WAL (weak acid leach). These samples
were analyzed using multi-element ICP-MS for 52 elements, REEs
(Rare Earth Elements), and isotopes of lead (Pb), carbon (C) and
nitrogen (N). Additional test work completed on each
drill-hole consisted of systematically scanning the core using ASD
Terraspec instrumentation (spectral analysis) to map the
change/spatial distribution of clay minerals through the cored
sandstone intervals. The ASD data provide a means for determining
the extent of clay alteration in the sandstone section above the
unconformity as a result of basement-sourced hydrothermal
activity.
The geochemical data obtained from core samples
(sandstone, fractures and basement rocks) strongly suggest that
certain mobile uranium pathfinder elements, hosted in basement
lithologies, have migrated vertically along fractures/fault systems
occurring in the sandstone as a result of basement structural
reactivation and coincident hydrothermal activity. The ASD clay
spectral data indicate a significant east to west increase in
illite clay alteration through the sandstone section, suggesting an
increase in hydrothermal activity west of drill-holes HL-01 and
EL-10 [map link1].
The 2012 infill-surface geochemical sampling
program (soils and tree-cores) was completed over the central and
eastern portions of the Halliday project [map link2].
This sampling program was designed to infill areas from which
samples were collected in 2011. The infill program was designed to
test data quality, sample reproducibility and to add surface
geochemical detail to the survey area. The combined infill area
sampled (2011/12) was 1250 hectares, resulting in the collection of
290 B- and C-horizon soils (clay separates) and 267 tree-cores on a
185 meter (average) sample grid. Clay separations from B- and
C-horizon soils were prepared at QFIR and submitted to Acme Labs in
Vancouver where they were analysed
using multi-element ICP-MS for 52 elements, REE and Pb isotopes.
The tree-cores were prepared and analyzed at QFIR for 50 elements
and Pb isotopes using HR ICP-SFMS. In conjunction with the infill
sampling program, a Gamma-Ray Spectrometer (GRS) survey was
conducted at each soil sample site (in-hole) to record the total
CPS of gamma radiation present.
The combined 2011/12 analytical results (clays
and tree-cores) indicated good overall data quality and
reproducibility (radiogenic 207Pb/206Pb
isotopic ratios and other pathfinder elements) for the clay
separates. The combined 2011/12 tree-core analytical data revealed
poor reproducibility between the two surveys, which was recently
determined to be the result of errors during the preparation of
some of the tree-cores at QFIR. This resulted in a number of errors
in the analytical results and a loss of a number of radiogenic Pb
anomalies previously reported in the 2011 survey.
The combined 2011/12 surface clay anomalies,
which are supported by the 2012 tree-core data, also vector toward
a potential target west of drill-hole HL-01 and EL-10 (as suggested
by the illite clay alteration described above) along Conductor A
[map link3]. The analytical results of the 2012 infill
surface geochemical program (clays and tree-cores) provided
Uravan's technical group significant insight into the advances and
limitations that this technology may provide for targeting uranium
mineralization at depth. More interpretive work is required to
fully understand the positive geochemical signals coming from
depth, as expressed in the clay separates, versus what may be
potentially masking these signatures based on the endogenous
geochemistry of the surficial environment (glacial till).
Uravan considers its current level of understanding and knowledge
of its surface geochemical approach proprietary, which supports our
on-going applied research and future development of this
technology.
Summary of key technical details from the
Halliday drilling and surface sampling program:
- EM conductor targets (Conductor A) were explained by drill-hole
intersections (EL-10, HL-005, HL-002, and locally in EL-09) of
favourable graphitic pelitic basement lithologies which are well
defined by the magnetic low and are characterized by steeply
northeast-dipping foliations and structures.
- The central magnetic low defines favourable graphitic basement
units; however, even moderate departure towards the magnetic high,
results in intersecting unfavourable pegmatite-dominated basement
(HL-001, HL-003, EL-11, HL-006, and to a lesser extent EL-09).
- The occurrence of major basement faulting has resulted in
extensive fracturing radiating upward into the Athabasca sandstone, suggesting major
structural reactivation along the Conductor A corridor.
- Pathfinder elements enriched in sandstone fractures radiating
from the basement are also elevated in pelitic basement lithologies
suggesting mobile element migration from depth to the surface
environment.
- The alteration and mineralogy of the basement units suggest a
dominantly reduced environment due to hydrothermal activity that
has had limited interaction with oxidized fluids, a missing key
ingredient for uranium mineralization at the unconformity in the
area tested.
- Uranium mineralization occurring in the basement of drill-holes
HL-003, HL-005 and EL-09 are positive indicators of uranium in a
system having a favourable geological/structural setting; however,
the lack of supportive elevated uranium mineralization in the lower
sandstone (MFa) above unconformity is another missing key component
in the area drilled.
- Pervasive illite clay mineral alteration occurring over
significant thicknesses in the Athabasca sandstone and well-developed
chlorite clay alteration above the unconformity (HL-001 and EL-10),
along with pervasive sandstone bleaching, elevated pathfinder
elements and REEs suggest that a more advanced hydrothermal and
structural system exists toward the untested western end of the
Conductor A corridor
- Positive surface geochemical anomalies (more interpretive work
required) also highlight an area west of drill-holes HL-01 and
EL-10 along Conductor A.
The 2012 drill program and surface sampling
program on the Halliday project was a joint exploration effort by
Uravan and Cameco Corporation (Cameco) [press release April 25, 2012]. Uravan is currently the operator
with the responsibility to plan and implement the exploration
program on behalf of Cameco. In a recent technical meeting with
Cameco, Uravan's technical group did not present a 2013 exploration
program on the Halliday project but deferred this proposal until
January 2013. Uravan believes the
cumulative results (geochemical and structural interpretation) of
the 2012 technical program is vectoring toward an untested area
west of drill-holes HL-01 and EL-10 [map link3]. Further
drilling in this area will be the basis of Uravan's proposal to
Cameco once Uravan's technical group has fully evaluated and
understands the 2012 data.
Uravan has presented Cameco with a 2013 program
and budget on the Stewardson project. Details of this proposal will
be announced in a separate press release in the near future.
Dr. Colin Dunn,
P. Geo., technical advisor for Uravan, is the Qualified Person for
the purposes of NI 43-101 with respect to the technical information
in this press release.
1The Athabasca Basin is an ancient
(Paleoproterozoic) sandstone basin located in northern Saskatchewan, Canada. The Athabasca sandstone (Manitou Falls (MF)
Formation) hosts high-grade uranium deposits at and below the
unconformity between the sandstone and the older crystalline
basement rocks. These unconformity-type uranium deposits occur in
sandstones at the sandstone-basement unconformity contact
(sandstone-hosted mineralization) and within the underlying
structurally disrupted crystalline basement (basement-hosted
mineralization). These unconformity-type uranium deposits account
for about 28 percent of the world's primary uranium production. The
ore grades are high, typically grading 2% to 20%
U308.
2Drill-hole HL-04 was abandoned
in the upper Athabasca sandstone
section (250 meters) due to highly broken core as a result of
fracturing and faulting.
3The Halliday surface anomalies
were identified by a multifaceted geochemical sampling program
completed by Uravan in the summer of 2011. This surface program
capitalized on new geochemical technologies developed from a
geochemical remote sensing study conducted over the Cigar West
Uranium deposit (Cigar Lake Study)4, which focused on
the detection of buried unconformity-related uranium mineralization
in under-explored areas in the Athabasca Basin
4The Cigar West Study was a
collaborative applied research program conducted by Uravan and QFIR
(Queen's Facility for Isotope Research5) in 2009 over a
known high-grade uranium deposit in the Athabasca Basin. The study was designed to
develop new surface geochemical techniques that can better identify
bedrock sources of uranium mineralization at depth. This
research clearly identified distinctive elements and isotopic
compositions that have been mobilized from the deposit (geosphere)
to the surface media (plants and soils) from depths >450 meters.
The Cigar Lake deposit is on the Waterbury/Cigar uranium property
located in the Athabasca Basin,
Saskatchewan, and is a joint
venture partnership between Cameco Corporation, AREVA, Idemitsu
Kosan Co. Ltd., and Tokyo Electric Power Co. [TEPCO]). Uravan
thanks both AREVA and Cameco for their collaboration and gracious
support for the Cigar West Study, and the support provided by the
Cigar Lake facility during our field operations.
5The Queen's Facility for Isotope Research
(QFIR) at Queens's University, Ontario is a state-of-the-art research
facility, comprising a group of highly experienced research
geochemists. The QFIR lab contains some of the most technologically
advanced analytical equipment in Canada. Under the direction of Dr.
Kurt Kyser, the QFIR research team
is working collaboratively with Uravan's technical group to develop
new exploration technologies using applied research.
Dr. Colin Dunn, an independent
specialist in biogeochemistry, is working closely with Uravan's
technical group and QFIR to advance the interpretation of
biogeochemical results. Dr. Kurt
Kyser and Dr. Colin Dunn are
key technical advisors for Uravan.
Uravan is a Calgary,
Alberta-based diversified mineral exploration company that
utilizes applied research to develop new innovative exploration
technologies to identify buried uranium, rare earth elements (REEs)
and nickel-copper-platinum group element (Ni-Cu-PGE) deposits in
under-explored areas. Our exploration focus in uranium is for
potential high-grade unconformity-type uranium deposits in the
Athabasca and Thelon Basins in
Canada and other basin
environments globally. Further, Uravan is pursuing the exploration
of its advanced- stage Rottenstone Ni-Cu-PGE project supported by
the development of new drill targets defined by recent geophysical
re-interpretation. Uravan is a publicly listed company on the
TSX Venture Exchange under the trading symbol UVN. All of the
mineral properties Uravan owns are considered in the exploration
stage of development.
This press release may contain forward looking statements
including those describing Uravan's future plans and the
expectations of management that a stated result or condition will
occur. Any statement addressing future events or conditions
necessarily involves inherent risk and uncertainty. Actual results
can differ materially from those anticipated by management at the
time of writing due to many factors, the majority of which are
beyond the control of Uravan and its management. In
particular, this news release contains forward-looking statements
pertaining, directly or indirectly, to the use of proceeds of the
Offering. Readers are cautioned that the foregoing list of
risk factors should not be construed as exhaustive. These
statements speak only as of the date of this release or as of the
date specified in the documents accompanying this release, as the
case may be. The Corporation undertakes no obligation to publicly
update or revise any forward-looking statements except as expressly
required by applicable securities laws.
Neither the TSX Venture Exchange nor its
Regulation Service Provider (as that term is defined in the
policies of the Exchange) accepts responsibility for the adequacy
or accuracy of this release.
SOURCE Uravan Minerals Inc.