Blackrock Announces Updated Mineral Resource Estimate for the Tonopah West Project Reports 6.12 Million Tonnes Grading 508.5 G/T AgEq For 100.04 Million Ounces AgEq
Blackrock Announces Updated Mineral
Resource Estimate for the Tonopah West
Project
Reports 6.12 Million Tonnes Grading 508.5 G/T AgEq For
100.04 Million Ounces AgEq
Vancouver, British Columbia--(Newsfile Corp. - October 10, 2023) - Blackrock Silver Corp. (TSXV:
BRC) (OTCQX: BKRRF) (the "
Company
" or "
Blackrock
") is pleased to report the results for its
updated mineral resource estimate (the "
Updated
MRE"
) for its 100% controlled Tonopah West project
("
Tonopah West
"), located in the Walker Lane trend of Western Nevada. Tonopah West is conveniently
situated directly adjacent to the town of Tonopah in Western Nevada, with highway US 95 traversing the
property, and the resource area lies exclusively within patented mining claims. All amounts herein are
presented in United States Dollars unless otherwise stated.
HIGHLIGHTS:
The Updated MRE contains a total of 0.57 million ounces ("
Moz
") of gold and 47.74Mozs of silver
or 100.04Mozs of silver equivalent ("
AgEq
"), which is a 135% increase over the maiden resource
estimate for Tonopah West (the "
Maiden MRE
") included in the technical report dated effective
April 28, 2022;
At a 200 g/t AgEq cut-off, the average grade of the inferred mineral resource is 508.5 g/t AgEq,
which is a 14% increase over the Maiden MRE;
The Updated MRE includes 6.12 million tonnes, which is a 106% increase over the Maiden MRE;
Blackrock's discovery costs are $0.29 per ounce of AgEq;
The Updated MRE is based on a structural re-interpretation of the Victor and DPB areas and
incorporation of the new drill information from the Northwest Step Out target.
The Updated MRE
captures approximately 3-kilometres of strike along the Tonopah West vein system;
Silver and gold mineralization remains open to the northwest and internally between Victor and
DPB, and DPB and the Northwest Step Out target, and at depth; and
Blackrock Silver to host investor webinar Wednesday, October 11, 2023 at 1:00 p.m. Pacific Time.
Table 1: Tonopah West Updated 2023 Mineral Resource Estimate
AgEq
cutoff g/t
(1)
Tonnes
Silver
g/t
Gold
g/t
AgEq
g/t
(2)
Ounces of
Silver
Ounces of Gold
Ounce of
Silver
Equivalent
(3)
Classification
(4)
200
6,119,000
242.6
2.90
508.5
47,738,000
570,000
100,038,000
Inferred
1
AgEq cutoff grade is based a total mining, processing and G&A cost of $119/tonne.
2 Silver Equivalent grade ratio used in this news of 84:1 is based on silver and gold prices of $22/ounce and $1,850/ounce,
respectively, and recoveries for silver and gold of 87% and 95%, respectively.
AgEq Factor= (Ag Price / Au Price) x (Ag Rec / Au Rec);
g AgEq/t = g Ag/t + (g Au/t / AgEq Factor).
3
Rounding as required by reporting guidelines may result in apparent discrepancies between tonnes, grade, and contained metal
content.
4
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 19, 2014,
and in accordance with National Instrument 43-101 -
Standards of Disclosure for Mineral Projects
("
NI
43-101
"). The effective date of the new mineral resources estimated by RESPEC (formerly Mine
Development Associates, "
RESPEC
") is October 6, 2023.
Andrew Pollard, the Company's President and Chief Executive Officer, stated,
"With delivery of our
second mineral resource estimate at Tonopah West in just three years of our initial discovery, we are
making great strides towards de-risking and reawakening one of the great American silver camps.
Compared to the Maiden MRE, our mineral inventory has grown by 135% AgEq and discovery costs
have plummeted to $0.29 per silver equivalent ounce.
The addition of 25,000 metres of new drilling
into the database, a re-interpretation of the underlying geologic model, and the modelling of the newly
discovered NW Step Out target highlights the expansion potential of the project.
This Updated MRE
has seen the footprint of mineralization more than double from the Maiden MRE, with the vein corridor
now stretching over 3 kilometers with the inclusion of the new NW Step Out target.
There are no signs
of the system stopping both along strike and at depth.
"Tonopah West is unparalleled within the industry as I see it, given its exceptional, safe jurisdiction,
incredible infrastructure, high-grade precious metal-only resource, excellent metallurgy and district
scale exploration upside.
Moreover, the entire resource is on private lands (patented claims)
potentially providing for a streamlined permitting process.
"Over 160 years since Nevada earned its moniker as the Silver State, and nearly a century since
commercial production shut down, most had assumed the history books had long since closed on this
once-renowned district. This resource marks a pivotal step toward the resurgence of this illustrious
mining camp, proving that the final chapters of the 'Queen of the Silver Camps' are yet to be written.
"
The Updated MRE is presented with block diluted grades.
The AgEq block model grades are based on
$22 per ounce of silver, $1,850 per ounce of gold, and 87% and 95% recoveries for silver and gold,
respectively.
The resource is reported using a cut-off grade which was calculated from estimated mining costs and
metallurgical recoveries.
Table 2 shows assumed 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
USD
Units
UG Mining
83
$/t Mined
Processing
22
$/t Processed
G&A
14
$/t Processed
Refining
0.50
$/oz Ag Produced
Silver Price
22
$/ounce
Gold Price
1850
$/ounce
Total
119
$/t Processed
Effective AgEq Cut off
200
g/t Ag
Kappes and Cassidy (KCA) 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%.
Based on the KCA data, a
recovery of 87% was used in the calculation of the resource cut off grade.
Table 3: Tonopah West 2023 Updated Resource Estimate by Area
Area
AgEq cutoff
g/t
(1)
Tonnes
Silver
g/t
Gold
g/t
AgEq
g/t
(2)
Ounces of
Silver
Ounces of
Gold
Ounces of
Silver
Equivalent
(3)
Classification
(4)
Victor
200
2,193,000
262.2
3.11
547.4
18,484,000
219,000
38,589,000
Inferred
DP
200
1,592,000
194.8
2.63
435.9
9,970,000
134,000
22,305,000
Inferred
Bermuda
200
1,360,000
298.8
3.53
623.4
13,063,000
154,000
27,250,000
Inferred
NW Step Out
200
976,000
198.3
1.97
379.2
6,220,000
62,000
11,894,000
Inferred
TOTAL
6,119,000
242.6
2.90
508.5
47,738,000
570,000
100,038,000
Inferred
1
AgEq cutoff grade is based a total mining, processing and G&A cost of $119/tonne.
2
Silver Equivalent grade ratio used in this news of 84:1 is based on silver and gold prices of $22/ounce and $1,850/ounce,
respectively, and recoveries for silver and gold of 87% and 95%, respectively.
AgEq Factor= (Ag Price / Au Price) x (Ag Rec / Au Rec);
g AgEq/t = g Ag/t + (g Au/t / AgEq Factor).
3
Rounding as required by reporting guidelines may result in apparent discrepancies between tonnes, grade, and contained metal
content.
4
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.
Blackrock completed a total of 198 drillholes (125,208 metres) between June 16, 2020 and December
15, 2022 from the surface drillhole. This drilling underpins the Updated MRE.
A total of $28.75 million
was expended since acquiring the option on Tonopah West on April 1, 2020 to September 30, 2023,
exclusive of option payments, holdings costs, and corporate G&A, which equates to a discovery cost of
$0.29 per ounce of AgEq.
Table 4: Drill footage from June 2020 to December 2022
Type
Feet
metres
Precollar
81,670.0
24,893.0
Core
128,266.2
39,095.5
RC
200,850.0
61,219.1
Total Completed
410,786.2
125,207.6
During 2023, the Company focussed its efforts on reviewing all drillhole and exploration data as well as
incorporating the Northwest Step Out area in to the geologic and resource model.
This review concluded
that the Tonopah West mineralization is closely associated with the arcuate margin of the Tonopah
Caldera.
As a result of this finding, the geologic model was revised to better capture the new structural
understanding of the distribution and orientation of the Tonopah West vein system.
This new
interpretation included re-logging and re-modelling the existing drill data and incorporating historic
underground information.
Silver and gold mineralization and continuity have now been established over a
three-kilometre strike. The vein system is open to the west-northwest and internally with undrilled areas
between Victor and DPB, and DPB and Northwest Step Out.
The new model is based on drillholes which are 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
are spaced approximately every 50 to 100-metres along sections with 50-metre distance between
sections in the DPB area.
At Victor, drillholes are spaced between approximately 25 to 50 metres apart
along sections with the sections 50 to 100-metres apart.
The Northwest Step Out area is one kilometre
northwest of the DPB resource.
Drillholes are spaced between 100 to 150 metres apart.
The Northwest
Step Out represents a new area not previously included in the May 2022 maiden resource.
The Updated MRE encompasses the Victor, DPB, Bermuda and the Northwest Step Out areas.
The
Victor area is approximately 500-metres by 250-metres while the DPB area is 800-metres by 800-
metres.
The Bermuda area is a high-grade vein within the DPB area, and the Northwest Step Out
represents a new extension of the vein zones to west-northwest.
RESPEC was supplied with 3-
dimensional vein shapes. Silver and gold mineral resources were modelled and estimated as follows:
Evaluate the drill data statistically;
Create tightly constrained low-, medium- and high-grade mineral-domain polygons for both silver
and gold on sets of cross sections spaced at 50-metre intervals;
Use the mineral-domain polygons as a basis to create three-dimensional solids;
Code a block model to the silver and gold domains for each of the two deposit areas using the
mineral-domain solids;
Analyze the modelled mineralization geostatistically to aid in the establishment of estimation and
classification parameters; and
Interpolate grades into models comprised of 1.5(east-west) x 1.5(north-south) x 1.5(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 1,800 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 for vein material and 2.36 grams/cm for wall rock.
RESPEC utilized Inverse Distance Cubed (ID
3
) interpolation for the estimation to obtain a localizing
effect in the mid- and high-grade domains, and an Inverse Distance Squared (ID
2
) in the low-grade
domains where mineralization is more diffuse.
All estimates are based on a block dimension of 1.5-
metre by 1.5-metre by 1.5-metre blocks.
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 200 g/t AgEq was selected based an assumed mining costs for
underground methods along with processing and G&A costs. At a 200 g/t AgEq cut off, the average
grade of the inferred resource is 508.5 g/t AgEq.
A technical report is being prepared on the Updated MRE in accordance with NI 431-101 (the
"
Technical Report
") and will be available on the Company's website and on SEDAR+ within 45 days of
the date of this news release.
The Updated MRE was prepared under the supervision of Mr. Jeffrey Bickel, CPG, an employee of
RESPEC, and he has reviewed and approved the technical contents relating to the Updated MRE in this
news release.
Blackrock's exploration activities at Tonopah West 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 NI 43-101. He has reviewed and approved the contents
of this news release.
All sampling is conducted under the supervision of the Company's project geologists, and a strict chain
of custody from the project to the sample preparation facility is implemented and monitored. The reverse
circulation samples are hauled from the project site to a secure and fenced facility in Tonopah, Nevada,
where they are loaded onto American Assay Laboratory's (AAL) flat-bed truck and delivered to AAL's
facility in Sparks, Nevada. A sample submittal sheet is delivered to AAL personnel who organize and
process the sample intervals pursuant to the Company's instructions.
The core, reverse circulation, and QA/QC samples are crushed and pulverized, then the pulverized
material is digested and analyzed for Au using fire assay fusion and an Induced Coupled Plasma (ICP)
finish on a 30-gram assay split. Silver is determined using five-acid digestion and ICP analysis. Over
limits for gold and silver are determined using a gravimetric finish. Data verification of the assay and
analytical results are completed to ensure accurate and verifiable results.
Mr. Bickel has reviewed the sampling, assaying, and security procedures used at Tonopah West and it
is his opinion that they follow industry standard procedures, and are adequate for the estimation of the
Updated MRE and for use in preparing the Technical Report.
Mr. Bickel completed audits of the database, performed a site visit, and reviewed quality assurance and
quality control data.
After performing his review, he considers the assay data to be adequate for the
estimation of the Updated MRE and for use in preparing the Technical Report.
Investor Webinar
Blackrock Silver will host an investor webinar on Wednesday, October 11, 2023 at 1:00 p.m. Pacific
Time.
To Register:
https://events.6ix.com/preview/blackrock-silver-tonopah-west-mre-update
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 of Directors, 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 an inferred mineral resource of 6.12 million
tonnes grading at 508.5 g/t AgEq for 100.04 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, without limitation: the Company's strategic
plans; estimates of mineral resource quantities and qualities; the timing of filing of the NI 43-101
technical report on the Updated MRE; 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 Tonopah West; 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.
To view the source version of this press release, please visit
https://www.newsfilecorp.com/release/183537