Blackrock Silver Increases Silver Cloud's Northwest Canyon Discovery Intersect by 33 Percent to 70 g/t Gold (2.0 Ounces per Ton) over 1.5m Following Receipt of Metallic- Screen Results
Blackrock Silver Increases Silver Cloud's
Northwest Canyon Discovery Intersect by 33
Percent to 70 g/t Gold (2.0 Ounces per Ton)
over 1.5m Following Receipt of Metallic-
Screen Results
Vancouver, British Columbia--(Newsfile Corp. - January 17, 2023) - Blackrock Silver Corp. (TSXV:
BRC) (the "Company" or "Blackrock") is pleased to announce the results of metallic screen gold
determinations on the Silver Cloud project situated 20 kilometres south of the Midas mine and 3
kilometres west of Hollister mine located along the prolific high-grade Northern Nevada Rift, in north-
central Nevada.
A metallic-screen gold assay completed on the high-grade intercept (1.5 metres) in SBC22-020 at
Northwest Canyon returned 70 g/t gold (calculated), 33% higher than the original assay of 52.62 g/t gold.
The +150 fraction returned 60.257ppm Au, while the average of the two -150 fractions returned
71.420ppm Au. The variability of gold in the intercept indicates the gold is not evenly distributed within
the vein.
Bonanza grades originally reported from SBC22-020 intersected 52.62 g/t gold (1.53 opt) and 606 g/t
silver (17.68 opt) over 1.5 metres, representing a new high-grade vein discovery (See December 7,
2022 news release).
The bonanza grades are associated with a banded quartz vein containing black
sulphides, and the 606 g/t silver is the highest-grade silver intercept at Silver Cloud to date.
Metallic-screen analysis is used when coarse or nuggety gold is suspected, especially in high-grade
gold values such as SBC22-020.
A larger 1,000 gram sample is split from the original sample reject
material and pulverized to approximately 200 mesh.
The pulverization process tends to "flatten"
malleable metallic minerals such as gold.
The sample is then screen sieved and two fractions are
created - a plus 150 mesh (coarse material) and a minus 150 mesh (fine material).
Coarse gold will
report to the coarse fraction.
Each fraction is analyzed by fire assay and a combined weighted averaged
determination is calculated for each gold value.
In the case of SBC22-020, most of the gold reported to the fine fraction indicating the gold is not coarse
or nuggety.
The 33 percent variation between the original assay determination and the metallic-screen
analysis indicates the gold is not evenly disseminated and a larger sample may be required for future
assays.
Discovery drillhole SBC22-020 targeted the projection of the NNW structure encountered in the
Company's 2019 drillhole (SBC19-002: 8.32 g/t gold over 1.52m) and Placer Dome's 2002 drillhole
(SCP-15: 5.61 g/t gold over 12.2m) and was drilled to 464 Metres (1523 ft).
SBC22-020's collar is a 366
metre step out from SBC19-002 (collar to collar) to the SSE along the interpreted structure. The assay
intercepts are separated by 425 metres.
Selected intervals were analyzed for metallic-screen gold in drillholes SBC22-019 and SBC22-021.
Table 1 shows the results of all the metallic-screen analysis.
Andrew Pollard, the Company's president and CEO, commented, "These metallic-screen assays
confirm our high-grade gold intercept at Northwest Canyon and returned a gold value 33% higher than
the original gold assay.
We are very excited by this new, multi-ounce discovery, which ties together drill-
defined mineralization across 425 metres, supporting the orientation and mineralization of the vein at
Northwest Canyon is more like that characterized at the Midas mine than the Hollister mine that is
adjacent to our property. In addition, metallic-screen analyses of an interval, drilled near the historic
Silver Cloud mercury mine, starting at 391.4 to 391.7 metres in SBC22-021, returned coarse gold,
reading 26.27 g/t Au in the +150 fraction, indicating the possibility of another high-grade gold vein."
Pollard continued, "At more than 45 square kilometres, Silver Cloud is an incredibly large, target-rich
project that has seen very little drilling despite the fact that it lies along a well known, high-grade gold
trend.
Home to some of the largest past producing mercury mines in America, with extensive epithermal
alteration, Silver Cloud represents one of the largest under-explored volcanic hosted gold and silver
epithermal districts in Nevada, and we control all of it."
SBC22-019 and -021 drilled at the historic Silver Cloud mercury mine returned significant thickness of
low-grade gold.
SBC22-021 retuned 20.6 metres grading 0.458 g/t gold, and a single metallic screen
determination returning 26.27 g/t gold in the coarse fraction (+150) of the analysis.
SBC22-021 is just
north of an area with shallow drilling completed in 1970s for mercury.
The presence of mercury and
coarse gold could indicate the existence of another high-grade vein south of the Silver Cloud mercury
mine.
Table 1: Results of metallic-screen gold assays for SBC22-019, SBC22-020 and SBC22-021
Drillhole ID
From
meters
To
meters
Interval
meters
Original Au
ppm
+150 Wt
grams
+150 Au
ppm
-150 Wt
grams
Average -
150 Au
ppm
Calc Au
ppm
Variance
percent
SBC22-019
260.0
261.5
1.5
0.071
90.00
0.039
769
0.063
0.060
-15.5%
SBC22-019
261.5
263.0
1.5
0.197
106.61
0.148
743
0.202
0.195
-1.0%
SBC22-019
263.0
264.6
1.5
0.111
87.60
0.089
762
0.118
0.115
3.6%
SBC22-019
264.6
265.3
0.8
0.164
69.24
0.154
736
0.168
0.167
1.8%
SBC22-019
265.3
266.2
0.9
0.258
60.88
0.176
650
0.277
0.268
3.9%
SBC22-019
266.2
267.3
1.1
0.578
73.64
0.487
645
0.633
0.618
6.9%
SBC22-019
267.3
267.9
0.6
0.277
20.96
0.126
657
0.294
0.288
4.0%
SBC22-019
267.9
268.8
0.9
0.112
48.64
0.061
681
0.127
0.122
8.9%
SBC22-019
268.8
270.4
1.5
0.112
56.56
0.065
706
0.115
0.111
-0.9%
SBC22-019
270.4
271.9
1.5
0.062
61.40
0.032
770
0.062
0.060
-3.2%
SBC22-020
305.1
306.6
1.5
0.037
88.62
0.028
687
0.038
0.037
0.0%
SBC22-020
306.6
307.5
0.9
0.056
48.40
0.033
708
0.052
0.051
-8.9%
SBC22-020
307.5
309.1
1.5
52.617
77.85
60.257
686
71.434
70.000
33.0%
SBC22-020
309.1
309.7
0.6
0.242
55.68
0.106
815
0.244
0.235
-2.9%
SBC22-020
309.7
311.2
1.5
0.130
90.24
0.048
743
0.119
0.111
-14.6%
SBC22-020
311.2
312.7
1.5
0.082
88.08
0.027
809
0.065
0.061
-25.6%
SBC22-021
356.9
357.4
0.5
0.143
60.53
0.172
699
0.145
0.147
2.8%
SBC22-021
357.4
358.9
1.5
0.273
59.64
0.179
790
0.308
0.298
9.2%
SBC22-021
358.9
359.8
0.9
0.295
74.95
0.182
807
0.294
0.284
-3.7%
SBC22-021
359.8
360.6
0.8
0.775
46.71
0.595
728
0.730
0.721
-7.0%
SBC22-021
360.6
361.8
1.2
0.591
57.56
0.522
744
0.592
0.586
-0.8%
SBC22-021
361.8
363.5
1.7
0.423
63.80
0.426
861
0.453
0.451
6.6%
SBC22-021
363.5
365.0
1.5
0.331
81.78
0.215
768
0.402
0.384
16.0%
SBC22-021
365.0
366.5
1.5
0.660
72.45
1.215
737
0.685
0.732
10.9%
SBC22-021
366.5
369.6
3.0
0.662
83.70
0.804
753
0.691
0.702
6.0%
SBC22-021
369.6
372.0
2.4
0.425
66.50
0.211
791
0.359
0.347
-18.4%
SBC22-021
372.0
374.3
2.3
0.185
45.00
0.171
83
0.248
0.220
18.9%
SBC22-021
374.3
377.3
3.0
0.423
54.44
0.455
826
0.442
0.442
4.5%
SBC22-021
377.3
380.4
3.0
0.371
43.23
0.323
787
0.416
0.411
10.8%
SBC22-021
380.4
383.4
3.0
0.148
60.53
0.172
838
0.168
0.168
13.5%
SBC22-021
391.4
391.7
0.3
1.590
9.73
26.269
462
0.779
1.305
-17.9%
Figure 1: 2022 drillhole location map
To view an enhanced version of Figure 1, please visit:
https://images.newsfilecorp.com/files/676/151473_957e05f534911a9d_002full.jpg
Table 2: Original Silver Cloud significant diamond drill hole assays above 0.3 g/t gold
Hole ID
Area
From (m)
To (m)
Length (m)
Au g/t
Ag g/t
AgEq g/t
SBC22-019
Silver Cloud Mine
218.85
221.90
3.05
0.442
0.385
44.6
SBC22-019
Silver Cloud Mine
224.94
227.99
3.05
0.377
0.360
38.0
SBC22-019
Silver Cloud Mine
266.24
267.31
1.07
0.578
0.49
58.3
SBC22-020
Northwest Canyon
307.54
309.07
1.52
52.617
606.00
5959.3
SBC22-021
Silver Cloud Mine
178.61
187.91
9.30
0.397
0.131
39.8
SBC22-021
Silver Cloud Mine
197.97
198.73
0.76
0.465
0.03
46.5
SBC22-021
Silver Cloud Mine
203.30
204.83
1.52
0.361
0.03
36.1
SBC22-021
Silver Cloud Mine
215.49
217.02
1.52
0.486
0.18
48.8
SBC22-021
Silver Cloud Mine
256.64
257.86
1.22
0.411
0.93
42.0
SBC22-021
Silver Cloud Mine
287.73
290.78
3.05
0.494
0.24
49.6
SBC22-021
Silver Cloud Mine
296.88
299.31
2.44
0.389
0.030
39.0
SBC22-021
Silver Cloud Mine
359.82
380.39
20.57
0.458
3.491
49.3
SBC22-021
Silver Cloud Mine
391.36
391.67
0.31
1.590
10.43
169.4
AgEq_g/t = Ag_g/t + Au_g/t*100; True thickness unknown; NSV = No significant values
Table 3: Drillhole location information
Hole ID
UTMNAD27 E
UTMNAD27 N
Elevation (m)
Total Depth (m)
Azimuth
Inclination
SBC22-019
531554
4544421
1615.1
462.5
273
78
SBC22-020
530149
4544148
1631.0
520.0
272
74
SBC22-021
531648
4544259
1556.3
464.2
268
73
Quality Assurance/ Quality Control
For metallic screen analysis, American Assay Laboratory (AAL) splits a 1000-gram sample from the
original coarse reject material for each analysis.
The 1000-gram split is pulverized and screened through
a 150-mesh sieve.
The +150 fraction is weighed and analyzed for gold by fire assay and/or gravimetric
finish.
The -150 fraction is weighed, and a 30-gram assay split is analyzed for gold using fire assay with
an ICP finish.
The final reported assay is calculated using a weighted average of the gold from the
coarse (+150) fraction and the gold from the fine (-150) fraction.
The original samples were collected under the supervision of the Company's project geologists, and a
strict chain of custody from the project to the sample preparation facility was implemented and
monitored. The core samples were hauled from the project site to a secure and fenced facility in Battle
Mountain, Nevada, where they are loaded on to AAL flat-bed truck and delivered to AAL's facility in
Sparks, Nevada.
A sample submittal sheet was delivered to AAL personnel who organize and process
the sample intervals pursuant to the Company's instructions.
The core 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. Blackrock personnel insert a blind prep blank, lab blank or
certified reference material approximately every 15
th
to 20
th
sample.
In addition, a random selection of
pulps are sent to ALS Minerals in Reno, Nevada, for check assays.
Blackrock's exploration activities at the Silver Cloud, Tonopah North and Tonopah West projects 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.
Backed by gold and silver ounces in the ground, Blackrock is a junior precious metal-focused
exploration company driven to add shareholder value via the drill bit. With 2.97 million tonnes grading
446 g/t silver equivalent
1
at its Tonopah West project, and a new bonanza-grade gold discovery at Silver
Cloud, the Company has a proven track record of exploration success. In addition to its gold and silver
project portfolio, the Company is credited with a lithium discovery, the Tonopah North project, which is
under option to a major lithium exploration group.
Anchored by a seasoned Board, the Company is
focused on its 100% controlled Nevada portfolio of properties consisting of low-sulphidation, epithermal
gold and silver mineralization located along the established Northern Nevada Rift in north-central Nevada
and the Walker Lane trend in western Nevada.
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 exercise of the First
Option and the Second Option and the transactions contemplated thereby, including the completion
of the Initial Earn-In and the Additional Earn-In, the entering into the Joint Venture, the Company's
strategic plans, 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 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 TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in
policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this
release.
_______________________________________
1
Technical information relating to the Tonopah West Project is based on and derived from the NI 43-101 report prepared for Blackrock entitled
"Technical Report and Estimate of Mineral Resources for the Tonopah West Silver-Gold Project, Nye and Esmeralda Counties, Nevada, USA"
effective April 28, 2022 (the "Technical Report"). The MRE outlines 2.97 million tonnes at a block diluted grade of 208 grams per tonne (g/t) silver (Ag)
and 2.5g/t gold (Au) for a total inferred mineral resource of 19,902,000 ounces Ag and 238,000 ounces Au, or 446 g/t silver equivalent (AgEq) for
42.6 million oz AgEq. AgEq 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
To view the source version of this press release, please visit
https://www.newsfilecorp.com/release/151473