Blackrock Announces Tonopah West Maiden Stope Optimized Resource Estimate; 2.9 Million Tonnes Grading 446 g/t AgEq for 42.6 Million Ounces AgEq
Blackrock Announces Tonopah West Maiden
Stope Optimized Resource Estimate; 2.9
Million Tonnes Grading 446 g/t AgEq for 42.6
Million Ounces AgEq
Vancouver, British Columbia--(Newsfile Corp. - May 2, 2022) - Blackrock Silver Corp. (TSXV: BRC) (the
"
Company
" or "
Blackrock
") is pleased to report the results of its Maiden Resource Estimate ("
MRE"
)
at its 100% controlled Tonopah West project, located in the Walker Lane trend of Western Nevada. The
Tonopah West project is conveniently situated directly adjacent to the town of Tonopah in Western
Nevada, with highway US 95 traversing the property, and the resource area is comprised entirely of
patented mining claims.
Table 1: Tonopah West Maiden Resource Estimate
Cut-off
US$/tonne
(
1)
Block Model
Value
US$/tonne
AgEq
cutoff g/t
Tonnes
Silver
g/t
Gold
g/t
AgEq
g/t
Ounces of
Silver
Ounces
of Gold
Ounce of
Silver
Equivalent
(
2)
Classification
(
3)
112
242
200
2,975,000
208
2.5
446
19,902,000
238,000
42,614,000
Inferred
1
US$ cutoff is the weighted average of longhole stope material at US$107/tonne and cut-and-fill material at $137/tonne
2
Silver Equivalent grade is based on silver and gold prices of US$20/ounce and US$1750/ounce, respectively, and recoveries for
silver and gold of 87% and 95%, respectively.
3
Mineral resources are not mineral reserves and do not have demonstrated economic viability. There is no certainty that all or
any part of the mineral resources estimated will be converted into mineral reserves.
The quantity and grade of reported Inferred
mineral resources in this estimation are uncertain in nature and there has been insufficient exploration to define these Inferred
mineral resources as Indicated mineral resources.
It is uncertain if further exploration will result in upgrading them to the
Indicated mineral resources category.
The MRE was prepared in accordance with Canadian Institute of Mining, Metallurgy and Petroleum
("
CIM
") Definition Standards - For Mineral Resources and Mineral Reserves adopted May 10, 2014,
and in accordance with National Instrument 43-101 "Standards of Disclosure for Mineral Projects" ("
NI
43-101
"). The effective date of the mineral resources estimated by RESPEC (formerly Mine
Development Associates, "
RESPEC
") is April 28, 2022.
Andrew Pollard, the Company's President and CEO, stated, "Last prominent for the part it played during
the era of the Pittman Act and the Peace Dollar, delivery of this maiden resource represents a historic
milestone, as one of the great American silver camps has been re-awakened, at a time where silver
serves as much more than just currency, but also as a crucial element required for the emerging global
electrified economy. By stope optimizing our initial mineral inventory we've engaged the gold standard of
detail, rigor and scrutiny for a project of this stage, which further de-risks the deposit while also bolstering
the credibility in the baseline credentials of the Tonopah West project.
Representing just eighteen
months of drilling data, this maiden mineral resource estimate establishes Tonopah West as one of the
highest-grade undeveloped silver deposits of size in the world
[1]
, with substantial resource expansion
potential remaining.
We have seen an excellent return on investment via the drill bit, with all-in discovery
costs of US$0.62 per ounce AgEq, and with drills at site turning at present we look forward to seeing this
project continue to take shape.
Congratulations to our Blackrock team, contractors, consultants and a
heartfelt thanks to the community of Tonopah who have embraced us and for making this impressive
high-grade precious metal discovery and maiden mineral resource estimate a reality."
The MRE is presented as a stope optimized resource.
Optimized stopes have a width of 1.5 metres,
and a height and minimum length of 4 metres.
The optimization resulted in stopes ranging from 4 metres
to 100 metres in length.
Block model metal values are based on US$20 per ounce of silver and
US$1750 per ounce of gold with each block having a combined value per tonne based on silver and
gold grade and their respective assigned recoveries.
The optimized resource is presented based on a split between cut-and-fill and longhole mining methods,
which would be applied to exploit relatively shallow-dipping and steeply-dipping veins, respectively.
Table 2 shows reasonable mining, processing and G&A cost for each mining method.
Table 2: Tonopah West mining, processing and G&A costs at the listed gold and silver price
Parameters Used
Longhole USD
C&F USD
Units
UG Mining
70
100
$/t Mined
Processing
24
24
$/t Processed
G&A
13
13
$/t Processed
Silver Price
20
20
$/ounce
Gold Price
1750
1750
$/ounce
Total
107
137
$/t Processed
Effective AgEq Cut off
190
244
g/t Ag
Kappes and Cassidy completed twelve bottle-roll tests on vein composites.
Silver returned recoveries
from 81% to 94% with an average recovery of 87%.
Gold recoveries from the twelve composites were
between 90% to 98% with and average recovery of 95%.
These recoveries were used in the calculation
of block model metal value within the stope optimization.
Table 3: Tonopah West Maiden Resource Estimate by Area
Area
Cut-off
US$/tonne
(
1)
Block Model
Value
US$/tonne
AgEq
cutoff g/t
Tonnes
Silver g/t
Gold g/t
AgEq
g/t
Ounces of
Silver
Ounces
of Gold
Ounce of
Silver
Equivalent
(
2)
Classification
(
3)
DPB
118
230
211
1,281,000
198
2.3
415
8,150,000
94,000
17,100,000
Inferred
Victor
107
251
190
1,694,000
216
2.7
469
11,752,000
144,000
25,514,000
Inferred
1
US$ cutoff is weight average of longhole stope material at $107/tonne and cut-and-fill material at $137/tonne
2
Silver Equivalent grade is based on silver and gold prices of US$20/ounce and US$1750/ounce, respectively, and recoveries for
silver and gold of 87% and 95%, respectively.
3
Mineral resources are not mineral reserves and do not have demonstrated economic viability. There is no certainty that all or
any part of the mineral resources estimated will be converted into mineral reserves.
The quantity and grade of reported Inferred
mineral resources in this estimation are uncertain in nature and there has been insufficient exploration to define these Inferred
mineral resources as Indicated mineral resources.
It is uncertain if further exploration will result in upgrading them to the
Indicated mineral resources category.
The MRE is based on a total surface drillhole database of 116 drillholes (65,870 metres) completed
between June 16, 2020, and December 31, 2021. Total expenditures of $26.3-million USD have been
made since acquiring the option on the project on April 1, 2020, to December 31, 2021, inclusive of all
exploration, option payments and holdings costs, and G&A, which equates to a total discovery cost
estimated to be US$0.62 per ounce of AgEq.
Drillholes were oriented between 90 to 50-degree inclinations from the surface with up to three drillholes
at different inclinations completed from the same drill pad.
Drillholes were spaced approximately every
50 to 100-metres along sections with 50-metre distance between sections in the DPB area.
At Victor,
drillholes were spaced between approximately 25 to 50 metres apart along sections with the sections 50
to 100-metres apart.
The MRE encompasses the Victor and DPB areas.
The Victor area is approximately 500-metres by
250-metres while the DPB area is 800-metres by 800-metres.
RESPEC was supplied with 3-
dimensional veins. Silver and gold mineral resources were modelled and estimated as follows:
Evaluate the drill data statistically;
Create low-, medium- and high-grade mineral-domain polygons for both silver and gold on sets of
cross-sections spaced at 50-metre intervals;
Push the sectional mineral-domain polygons three-dimensionally to the drill data within each
sectional window;
Slice the three-dimensional mineral-domain polygons along 2-metre-spaced horizontal planes and
using these slices to recreate the silver and gold mineral-domain polygons on level plans;
Code a block model to the silver and gold domains for each of the two deposit areas using the
level-plan mineral-domain polygons;
Analyze the modelled mineralization geostatistically to aid in the establishment of estimation and
classification parameters; and
Interpolate grades into models comprised of 4(east-west) x 1(north-south) x 2(vertical)-metre
blocks using the silver and gold mineral domains to explicitly constrain the grade estimations.
Drillhole assay samples were composited within the mineralized domains into 1.5-metre length
composites.
High-grade capping was completed on composite data and established using a statistical
analysis for silver and gold.
Silver was capped at 2,000 g/t, and gold was capped at 20 g/t.
Specific gravity test work was completed for 92 core samples.
Results indicate an average density of
2.49 grams/cm
3
for vein material and 2.36 grams/cm
3
for wall rock.
RESPEC utilized Inverse Distance Cubed (ID
3
) interpolation for the estimation.
All estimates are based
on a block dimension of 4-metre by 1-metre by 2-metre where 4-metres is in the east-west direction, 1-
metre is in the north-south direction and 2-metre is the height of the block.
The original deposit had been depleted by historical mining in the Victor area.
Approximately 200,000
tonnes of material were removed from the Victor resource estimate.
In the DPB area, no historical
mining records were documented.
A cut-off for the reported resource of 107 US$/tonne and 137 US$/tonne were selected for longhole and
cut-and-fill stoping, respectively, based on cost estimates for mechanized and narrow-vein mining
methods.
At a 112 US$/tonne weight average cut off, the average grade of the inferred resource is 242
US$/tonne (446 g/t AgEq).
There is a significant positive consequence for the average grade being
more than double the cut-off grade.
Additional technical details are being prepared in a report in accordance with N.I. 43-101 ("Technical
Report and Estimate of Mineral Resources for the Tonopah West Silver-Gold Project, Nye and
Esmeralda Counties, Nevada, USA," Michael S. Lindholm and Jeffrey Bickel) and will be filed on
SEDAR and made available on the Company's website within 45 days of the date of this news release.
The Tonopah West MRE was prepared under the supervision of Messrs. Michael S. Lindholm, CPG of
RESPEC and Jeffrey Bickel CPG an associate of RESPEC, and they have reviewed and approved the
technical contents relating to the MRE in this release.
Blackrock's exploration activities at the Tonopah West project are conducted and supervised by Mr.
William Howald, Executive Chairman of Blackrock. Mr. William Howald, AIPG Certified Professional
Geologist #11041, is a Qualified Person as defined under National Instrument 43-101. He has reviewed
and approved the contents of this news release.
About Blackrock Silver Corp.
Blackrock is a junior precious metals focused exploration company that is on a quest to make an
economic discovery. Anchored by a seasoned Board, the Company is focused on its Nevada portfolio of
properties consisting of low-sulphidation epithermal gold & silver projects located along the established
Northern Nevada Rift in north-central Nevada and the Walker Lane trend in western Nevada. Its flagship
Tonopah West project hosts a stope optimized inferred maiden resource of 2.9 million tonnes grading at
446 g/t AgEq for 42.6 million oz AgEq.
For further information, please contact:
Andrew Pollard, President & CEO
Blackrock Silver Corp.
Phone: 604 817-6044
Email:
Forward-Looking Statements
This news release contains "forward-looking statements" within the meaning of Canadian securities
legislation. Such forward-looking statements concern the Company's strategic plans, completion of
the maiden resource estimate on the Tonopah West project, timing and expectations for the
Company's exploration and drilling programs, estimates of mineralization from drilling, geological
information projected from sampling results and the potential quantities and grades of the target
zones. Such forward-looking statements or information are based on a number of assumptions, which
may prove to be incorrect. Assumptions have been made regarding, among other things: conditions
in general economic and financial markets; accuracy of assay results; geological interpretations from
drilling results, timing and amount of capital expenditures; performance of available laboratory and
other related services; future operating costs; and the historical basis for current estimates of potential
quantities and grades of target zones. The actual results could differ materially from those anticipated
in these forward-looking statements as a result of
risk factors, including the ability of the Company to
make payments related to the lease option to purchase the Tonopah West project; the timing and
content of work programs; results of exploration activities and development of mineral properties; the
interpretation and uncertainties of drilling results and other geological data; receipt, maintenance and
security of permits and mineral property titles; environmental and other regulatory risks; project costs
overruns or unanticipated costs and expenses; availability of funds; failure to delineate potential
quantities and grades of the target zones based on historical data, and general market and industry
conditions. Forward-looking statements are based on the expectations and opinions of the Company's
management on the date the statements are made. The assumptions used in the preparation of such
statements, although considered reasonable at the time of preparation, may prove to be imprecise
and, as such, readers are cautioned not to place undue reliance on these forward-looking statements,
which speak only as of the date the statements were made. The Company undertakes no obligation to
update or revise any forward-looking statements included in this news release if these beliefs,
estimates and opinions or other circumstances should change, except as otherwise required by
applicable law.
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.
[1]
Source: S&P Global; Company reports as of April 28, 2022. AgEq resources and grade reflect only silver and gold (M&I and I) resources
(excludes base metals) for deposits larger than 40 million ounces AgEq.
To view the source version of this press release, please visit
https://www.newsfilecorp.com/release/122317