Westhaven Reports 95% Gold and 96% Silver Recoveries in Preliminary Metallurgical Test Work at the Shovelnose Gold Property
15 Novembro 2021 - 9:30AM
Westhaven Gold Corp. (TSX-V:WHN) is pleased to
announce preliminary metallurgical test results at its 100% owned
17,623-hectare Shovelnose gold property. Shovelnose is located
within the prospective Spences Bridge Gold Belt (SBGB), which
borders the Coquihalla Highway 30 kilometers south of Merritt,
British Columbia.
Gareth Thomas, President & CEO of Westhaven
Gold, states: “We are pleased that two tranches of initial
metallurgical test work undertaken by ALS Metallurgy Kamloops
demonstrate high gold (average 95%) and silver (average 96%)
recoveries from three quartz vein systems that comprise the South
Zone. Mineralization is non-refractory and amenable to recovery by
a standard industry process flowsheet. Results will support our
maiden resource estimate on the South Zone, due in early Q1
2022.”
Highlights of Work by ALS Metallurgy
Kamloops:
- representative samples (14.5 to 18.0
kg mass) were submitted from each of the three main quartz vein
systems within the South Zone (four from Vein Zone 1, and one each
from Vein Zones 2 and 3)
- feed grades for the six samples
assayed between 3.3 and 37.1 g/t gold, and between 12 and 136 g/t
silver – see table below for details
- sulphur measured between 0.3 and 0.7%;
nearly all as sulphide sulphur
- carbon measured between 0.04 and 0.7%;
with low levels of organic carbon (0.03 to 0.04%) with a low
percentage as coarse “nugget” gold
- combined flotation recovery and
cyanidation extraction of gold ranged from 93 to 98% (average 95%),
and for silver from 95 to 98% (average 96%)
- recoveries through an industry
standard process flowsheet were comparable for both lower and
higher-grade samples, and for each of the three vein zones
Metallurgical Test Programs and
Results:
Westhaven prepared six composite samples for
preliminary metallurgical work from archived jaw crushed coarse
(>70% passing 2mm square mesh sieve) ‘reject’ drill core
material associated with routine sampling activities. This crushed
drill core should be sufficient for scoping level testing, but
there may be some degradation in the performance of the samples
during testing. Westhaven has collected additional drill core from
the South Zone during 2021 and, once the maiden mineral resource
estimate has been completed, this fresh uncrushed core would be
available for additional metallurgical testwork beyond scoping
levels. Samples ranged from 14.5 to 18.0kg each (combined total of
97 kg), with four composite samples submitted to ALS Metallurgy
Kamloops from Vein Zone 1 mineralization, and one each from Vein
Zones 2 and 3. Results of two tranches of test work completed in
2021 are compiled in the table and figure below. A point form
summary of the two metallurgical test results is also provided.
A table accompanying this announcement is
available
at:https://www.globenewswire.com/NewsRoom/AttachmentNg/0b983c9d-b43a-42d8-802e-23bb97560b5a
A graph accompanying this announcement is
available
at:https://www.globenewswire.com/NewsRoom/AttachmentNg/313a6608-8e1c-4f39-ae70-212e485c1ed3
Notes:
- Achieved lengths for samples VnZn1–21
and VnZn2–1933 show a slight difference due to missing coarse
reject material. In VnZn1-21 a single 0.35m interval could not be
found. Three samples totaling 2.1m length were missing from
VnZn2–1933.
- As reported by ALS Metallurgy Kamloops
(“ALS”), an ISO 9001:2015 certified testing laboratory.
- Gold head grade in g/t from nominal
500g screened metallic assay as reported by ALS Metallurgy
Kamloops.
- Silver head grade from aqua regia
digestion (g/t) as reported by ALS Metallurgy Kamloops. Silver head
grades were also derived from 4 acid digestion carried out by ALS
Geochemistry Vancouver, and agree within a few percentage
points.
- Check assays on select sample
materials returned from the metallurgical test work, including head
feed and concentrates, were submitted by Westhaven to an
independent third-party analytical facility whose results support
those reported by ALS.
- Primary grind sizing was a nominal 75
micron K80 (80% of material passing through a 75 micron mesh
screen).
- Gold and silver recovery percentages
are for combined flotation recovery and cyanidation extraction, as
reported by ALS Metallurgy Kamloops.
Two tranches of metallurgical testwork were
undertaken by ALS Metallurgy Kamloops in 2021. Primary objectives
of the first program (KM6326) were to:
- Assess the chemical content of six
provided samples through standard chemical assays, screened
metallic gold assays, and multi-element ICP analyses.
- Assess the amenability of the gold
and silver within the six samples to gravity concentration through
laboratory scale Knelson gravity testing with hand panning of the
Knelson concentrate.
- Assess the amenability of the gold
and silver within the six samples to bulk froth flotation
separation through rougher flotation testing.
- Assess the cyanidation extraction
potential of gold and silver within the six samples through
cyanidation leach extraction bottle roll tests.
The second program (KM6393) was conducted as a
follow-up to the initial testing to assess finer primary grind
sizings and additional flowsheet configurations using the remaining
sample mass. The primary objectives of the second program were
to:
- Assess the effect of a finer
primary grind sizing on the gold and silver recovery for the six
samples using bulk rougher flotation separation.
- Assess the cyanidation extraction
potential of gold and silver for the six samples at a finer primary
grind sizing through whole ore cyanidation leach extraction bottle
roll tests.
- Investigate a flowsheet
incorporating bulk froth flotation with cyanidation of the
flotation tailings at both primary grind sizings, through
cyanidation bottle roll testing on rougher tailings.
Results of the two metallurgical programs are
summarized below:
- Screened metallic gold grades for
the six feed grades measured between 3.3 and 37.1 g/t.
- Silver content by wet digestion
ranged between 12 and 136 g/t.
- Sulphur measured between 0.3 and
0.7 percent; nearly all as sulphide sulphur.
- Carbon measured between 0.04 and
0.7 percent; with low levels of organic carbon (0.03 and 0.04
percent), suggesting that there should not be issues with reagent
consumption or gold/silver preg-robbing during a cyanidation
leaching procedure.
- Initial investigations used a
primary grind sizing of 150um K80, and supplementary work used a
75um K80 grind.
- A Bond ball work index test for a
composite prepared from the remaining sample mass of four of the
six original samples was calculated at about 20 kWhr/tonne.
- Gravity recovery and screened
metallic analyses indicate that there was likely not a presence of
coarse “nugget” gold, and that a gravity recovery circuit would not
likely be included in mine design.
- Combined flowsheet test results
recorded reagent consumptions slightly lower at the coarser primary
grind sizing with sodium cyanide consumptions recorded at 0.46
kg/tonne leach feed and lime consumption at about 0.66 kg/tonne
leach feed. At the finer primary grind sodium cyanide consumptions
averaged about 0.63 kg/tonne leach feed and lime consumption was
recorded at about 0.74 kg/tonne leach feed.
- ALS Metallurgy Kamloops
concluded that the highest recoveries/extractions of gold and
silver were produced through initial rougher flotation with
cyanidation leaching of the rougher tailings. At the finer primary
grind sizing, the average combined flotation recovery and
cyanidation extraction of gold and silver measured 95 and 96
percent, respectively.
Recommendations for future testing include
optimization of rougher tailings cyanidation conditions,
cyanidation of rougher concentrates, cleaner flotation testing and
a more extensive variability program – all of which would require
larger masses of feed material – as well as confirming
marketability of the final concentrate.
On behalf of the Board of
DirectorsWESTHAVEN GOLD CORP."Gareth Thomas"
Gareth Thomas, President, CEO & Director
Qualified Person Statement
Peter Fischl, P.Geo., who is a Qualified Person
within the context of National Instrument 43-101 has read and takes
responsibility for this release. Results for the two metallurgical
test programs were provided and approved by Robert Sloan, P.Eng, VP
ALS Metallurgy Americas, a Qualified Person for the purpose of
National Instrument 43-101. Westhaven’s ongoing Quality Assurance
and Quality Control programs include auditing of all exploration
data. Any significant changes will be reported when available.
Neither the TSX Venture Exchange nor its
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.
About Westhaven Gold Corp.
Westhaven is a gold-focused exploration company
advancing the high-grade discovery on the Shovelnose project in
Canada’s newest gold district, the Spences Bridge Gold Belt.
Westhaven controls 37,000 hectares (370 square kilometres) with
four 100% owned gold properties spread along this underexplored
belt. The Shovelnose property is situated off a major highway, near
power, rail, large producing mines, and within commuting distance
from the city of Merritt, which translates into low-cost
exploration.
Westhaven trades on the TSX Venture Exchange
under the ticker symbol WHN. For further information, please call
604-681-5558 or visit Westhaven’s website at
www.westhavengold.com.
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