GR Silver Mining Reports Drill Results at the Plomosas Silver Project Significant Near
GR Silver Mining Reports Drill Results at the
Plomosas Silver Project Significant Near
Surface Intervals, Including: 5.1 m @ 19.2 g/t
Au and 18.0 m @ 554 g/t AgEq
VANCOUVER, BC, Sept. 16, 2020 /CNW/ - GR Silver Mining Ltd. (TSXV: GRSL) (FRANKFURT:
GPE) (OTCQB: GRSLF) ("GR Silver Mining" or the "Company") – is pleased to announce drill
results from the Company's recently announced surface core drilling program in the Plomosas Mine
Area as well as results from the ongoing validation of historic drilling at its 100%-owned Plomosas
Silver Project ("Plomosas Project") in Sinaloa, Mexico.
The initial two drill holes completed and released are in the Plomosas Mine Area, targeting
expansion of the mineralization footprint along strike, and confirmation of attractive near surface
mineralized zones. The results received confirm the presence of wide, shallow or near surface silver-
gold-lead-zinc (polymetallic) veins and hydrothermal breccias. Our ongoing review and validation of
historic data on the same sections indicates high grade silver and gold mineralization in low
sulphidation epithermal veins outside of the polymetallic silver rich hydrothermal breccia zone. The
drilling currently in progress has validated recent geological modelling, confirming near surface zones
of wide Ag-Au-Zn-Pb mineralization. Recent access to historic workings near the area being drilled
by the Company, together with historic and recently completed drill holes, is being integrated into a
3D model to support the expansion and potential delineation of near surface resources.
The drilling completed to date, together with recently announced results, has delineated a 700 m
long mineralized system (Figure 1), consisting of multiple veins. It demonstrates the presence of, not
only the polymetallic Pb-Zn-Ag rich hydrothermal breccia hosted on the N-S oriented low angle
Plomosas Fault, but also a series of high angle, low sulphidation vein and stockwork systems,
commonly on the hanging wall or cross cut by the former hydrothermal breccias.
The mineralized zones reported in this news release represent multiple mineralization styles,
including wide, polymetallic Pb-Zn-Ag rich hydrothermal breccias, high grade Au in low sulphidation
veins/stockworks and narrow high grade Ag low sulphidation veins. The definition of wide zones, or
high grade zones close to the surface, represents a new opportunity for future shallow drilling along
strike, aiding potential resource definition.
GR Silver Mining President and CEO, Marcio Fonseca, commented, "First assay results have
now been received from GR Silver Mining's own drilling program at Plomosas. We continue to
encounter evidence of a large hydrothermal system at the Plomosas Mine Area with the
identification of wide mineralized intervals or high grade zones representing mulltiple
mineralization styles and events. Our 3D integration of the recent and historic drilling data has
proved valuable in defining the Pb-Zn-Ag mineralized zones, as well as the discovery of several
attractive near surface Ag-Au-Pb-Zn zones. The recent recommissioned access to the Plomosas
underground mine, together with surface access provide a unique opportunity to guide our surface
and underground drilling program in the upcoming months, aiming at further discoveries and
delineation of a resource in the area."
Figure 1: Drone Image of the Plomosas Mine Area (looking to the NW) - Drill Hole Location Map
(CNW Group/GR Silver Mining Ltd.)
GR Silver Mining is currently advancing its surface drilling program on the two areas marked on
Figure 1. The Company recently completed the integration of a previous ground geophysical survey
(IP) in the area and has advanced its program of underground mapping and sampling.
The initial
4,500 m
surface core drilling program is expected to continue through 2020 and has a dual
focus: shallow drilling (up to
150 m
below surface) to expand the known mineralized zones along
strike at the Plomosas Mine and San Juan-La Colorada Areas, and follow-up drilling on several new
high-grade Au-Ag low sulphidation epithermal vein occurrences at
Yecora
and El Saltito (see
news release dated
July 15, 2020
).
The planned drill sites on the Plomosas Project are located in the Plomosas Mine Area and San
Juan Trend areas where historic drilling was completed by previous owners, however GR Silver
Mining have outlined un-drilled areas with additional multiple epithermal veins along strike and at
shallow depth.
In addition to drill testing the areas with historic drill holes at the Plomosas Project, the Company will
also commence initial reconnaissance and surface exploration on 11 priority targets identified as
displaying potential for new discoveries.
Table 1 summarizes the most significant drill assay results for this set of drill holes released for the
Plomosas Mine Area.
Table 1: Summary Surface Drill Hole Results - News Release
September 16, 2020
(Plomosas
Mine Area)
SURFACE DRILLING PROGRAM 2020
Hole No.
From
(m)
To
(m)
Drilled
width
(m)
Est.
true
width
(m)
Ag
g/t
Au
g/t
Pb
%
Zn
%
AgEq
g/t
PLS20-01
8.0
16.5
8.5
6.0
85
0.4
1.1
0.6
177
includes
11.5
15.0
3.5
2.5
172
0.9
2.7
1.4
387
PLS20-02
72.4
98.1
25.7
22.3
48
0.1
0.3
0.6
85
101.0
149.0
48.0
41.6
na
na
0.1
0.5
includes
139.0
146.9
7.9
6.8
na
na
0.4
1.4
HISTORIC DRILLING DATA
Hole No.
From
(m)
To
(m)
Drilled
width
(m)
Est.
true
width
(m)
Ag g/t
Au g/t
Pb %
Zn %
AgEq
g/t
PLS-3
74.2
88.3
14.1
12.2
46
na
0.1
0.2
55
98.8
103.9
5.1
4.4
16
19.2
0.1
0.1
1,986
PLS-6
77.5
80.7
3.2
3.2
74
0.2
0.2
0.3
87
237
136.8
145.8
9.0
4.5
na
na
0.4
1.0
241
51.0
51.7
0.8
0.6
163
0.3
0.6
0.7
232
251
58.0
59.1
1.1
06
136
na
0.9
1.1
251
119.3
123.7
4.4
2.5
na
1.8
0.1
na
261
206.5
226.5
20.0
15.3
na
1.2
na
na
268
163.0
168.9
5.9
4.5
73
0.3
0.2
0.4
127
315
21.0
39.0
18.0
16.9
321
0.9
2.7
1.9
554
318
36.0
50.0
14.0
9.0
30
1.7
1.3
2.0
318
PSD-1
77.8
101.5
23.7
20.5
81
na
na
na
PSD-2
75.0
88.7
13.7
11.9
44
na
0.1
0.3
93.6
100.8
7.2
6.2
na
na
0.3
1.0
121.7
132.6
10.9
9.4
na
0.3
0.2
1.1
PSD-3
95.1
108.0
12.9
11.2
na
na
0.4
0.5
PSD-5
84.3
91.3
7.0
7.0
32
na
na
na
PSD-7
63.3
65.6
2.4
2.2
83
na
na
na
75.5
96.6
21.0
19.3
27
na
na
na
109.7
125.0
15.3
14.0
na
na
0.2
0.4
PSD-11
89.3
103.3
14.0
13.8
37
na
na
na
SD-83
61.3
66.7
5.5
5.2
18
na
0.1
0.2
*
AgEq is based on long term gold, silver, zinc and lead prices of US$1600 per ounce gold, US$16.50 per ounce silver, US$0.85 per pound zinc and US$0.95 per pound lead.
The metallurgical recoveries are assumed as 90% Ag, 95% Au, 78% Pb and 70% Zn. "na" = no relevant assays. All numbers are rounded. Results are uncut and undiluted.
UG: Underground Drill Hole, SURF: Surface Drill Hole
The drill holes in this news release were generated by a core drilling campaign initiated by the
Company in Q3/2020 (PLS20-01 and PLS20-02), and historical drill holes completed by Grupo
Mexico. Neither of the drill sets were previously released.
The area being drilled has a series of outcrops representing quartz stockwork veining and locally
hydrothermal breccias hosted in a Tertiary volcanic bimodal andesitic-rhyolitic sequence commonly
intruded by rhyolitic dykes. Structurally, the area is marked by a series of high angle NW trending
faults which are commonly intersecting the N-S low angle Plomosas Fault, a common host structure
for Ag-Au-Pb-Zn polymetallic hydrothermal breccias (
link to cross section 1
,
link to cross section 2
).
Alteration is mainly represented by a propylitic assemblage containing chlorite-epidote-quartz-pyrite
and abundant specular hematite. Locally on surface, argillic alteration halos and large oxidized zones
are observed, a result of previous accumulation of pyrite and other sulphides. The polymetallic
mineralization is mainly represented by fine galena and sphalerite, common hematite-quartz
cemented hydrothermal breccias and filling veins. Late stage quartz Ag-Au epithermal veining is
commonly observed overprinting Ag-Pb-Zn mineralization in the hydrothermal breccias.
Table 2 lists the drill hole intervals previously not sampled ("NS") for this group of released holes.
The Company continues to investigate previous unsampled intervals for evidence of mineralization in
the core that warrants additional sampling and assaying.
Additionally, Table 3 provides collar coordinates for the drill holes presented in this news release.
Table 2: Plomosas Mine Area - Drill Hole Intervals Not Sampled (Intervals greater than
20m
)
Hole No.
From-To (m)
Sampling
PLS-3
0.00 m to 74.2m
NS
PLS-6
0.00 m to 59.1 m
NS
237
0.00 m to 18.95 m
NS
241
0.00 m to 18.05 m
NS
251
0.00 m to 24.35 m
NS
261
0.00 m to 152.15 m
NS
268
0.00 m to 99.45 m
NS
PSD-11
0.00 m to 89.3 m
NS
SD-83
0.00 m to 61.3 m
NS
All numbers are rounded. NS - Core not assayed
Table 3: Drill Hole Locations – News Release
September 16, 2020
(Plomosas Mine Area)
Hole No.
East (m)
North (m)
RL (m)
Azimuth
Dip
Depth (m)
PLS20-01
451,586
2,552,252
940
270
-60
150.85
PLS20-02
451,486
2,551,539
986
0
-90
165.0
PLS-3
451,490
2,551,532
977
0
-90
105.85
PLS-6
451,490
2,551,532
977
90
-70
169.6
237
451,483
2,552,240
958
330
-65
201.2
241
451,502
2,552,207
959
308
-70
85.3
251
451,484
2,552,184
975
308
-60
160.25
261
451,404
2,552,189
1,010
308
-67
291.9
268
451,418
2,552,210
1,005
308
-70
255.05
315
451,282
2,552,218
795
45
-90
84.3
318
451,282
2,552,218
795
326
-53
71.65
PSD-1
451,474
2,551,541
980
270
-81
145.5
PSD-2
451,474
2,551,541
980
90
-86
260.15
PSD-3
451,477
2,551,538
980
90
-71
251.7
PSD-5
451,477
2,551,538
980
53
-50
214.0
PSD-7
451,477
2,551,538
979
53
-80
131.8
PSD-11
451,431
2,551,511
977
55
-70
379.85
SD-83
451,488
2,551,509
985
55
-80
316.2
All numbers are rounded.
The Company believes that the Plomosas Mine Area is part of a much larger low sulphidation
epithermal system as indicated by field evidence along 1.0 km of strike length, where only
400 m
of
that strike had previously been drilled. This represents an opportunity for the Company's current
surface drilling program to continue discovering new mineralized zones close to the surface.
Qualified Person
The scientific and technical data contained in this News Release related to the Plomosas Project
was reviewed and/or prepared under the supervision of Marcio Fonseca, P.Geo. He has approved
the disclosure herein.
Quality Assurance Program and Quality Control Procedures ("QA/QC")
The Company has implemented QA/QC procedures which include insertion of blank and standard
samples in all sample lots sent to SGS de México, S.A. de C.V laboratory facilities in
Durango,
Mexico
, for sample preparation and assaying. For every sample with results above Ag >100 ppm
(over limits), these samples are submitted directly by SGS de
Mexico
to SGS Canada Inc at
Burnaby, BC
. The analytical methods are 4-acid Digest and Inductively Coupled Plasma Optical
Emission Spectrometry with Lead Fusion Fire Assay with gravimetric finish for silver above over
limits. For gold assays the analytical methods are Lead Fusion and Atomic Absorption Spectrometry
Lead Fusion Fire Assay and gravimetric finish for gold above over limits.
The recent drill holes completed by First Majestic from 2016 to 2018, followed QA/QC protocols
reviewed and validated by GR Silver Mining, including insertion of blank and standard samples in all
sample lots sent to First Majestic's Laboratorio Central facilities in La Parilla, Durango, for sample
preparation and assaying. Additional validation and check assays were performed by an
independent laboratory at SGS de México, S.A. de C.V. facilities in
Durango, Mexico
. The analytical
methods applied for these recent holes for Ag and Au assays comprised of Fire Assay with Atomic
Absorption finish for samples above Au >10ppm and Ag >300ppm and Gravimetric Finish. Pb and Zn
were analyzed using Inductively Coupled Plasma Optical Emission Spectrometry. GR Silver Mining
has not received information related to the Grupo Mexico QA/QC and assay protocols and at this
stage is considering the information historic for news release purposes.
About GR Silver Mining Ltd
.
GR Silver Mining Ltd. is a
Mexico
-focused company engaged in cost-effective silver-gold resource
expansion on its key assets which lie on the eastern edge of the Rosario Mining District,
Sinaloa,
Mexico
.
PLOMOSAS SILVER PROJECT
GR Silver Mining owns 100% of the Plomosas Silver Project located near the historic mining village
of
La Rastra
, within the Rosario Mining District. The Project is a past-producing asset where only
one mine, the Plomosas silver-gold-lead-zinc underground mine, operated from 1986 to 2001. The
Project has an 8,515-hectare property position and is strategically located within 5 km of the San
Marcial Silver Project in the southeast of Sinaloa State,
Mexico
. The Plomosas Project comprises six
areas with an average of 100 surface and underground drill holes in each area, geophysical and
geochemical data covering most of the concession, 16 new exploration targets from which 11 have
high priority for future exploration programs.
The 100%-owned assets include all facilities and infrastructure including: access roads, surface
rights agreement, water use permit,
8,000 m
of underground workings, water access, 60 km - 33
KV power line, offices, shops, 120-person camp, infirmary, warehouses and assay lab representing
approximately
US$30m
of previous capital investments. The previous owners invested approximately
US$18 million
in exploration.
The silver and gold mineralization on this Project display the alteration, textures, mineralogy and
deposit geometry characteristics of a low sulphidation epithermal silver-gold-base metal vein/breccia
mineralized system. Previous exploration was focused on Pb-Zn-Ag-Au polymetallic shallow
mineralization, hosted in NW-SE structures in the vicinity of the Plomosas mine. The E-W portion of
the mineralization and extensions for the main N-S Plomosas fault remains under-explored. The
Plomosas Silver Project has more than 500 recent and historical drill holes in six areas – Plomosas
Mine,
San Juan
,
La Colorada
,
Yecora
,
San Francisco
and El Saltito. These drill holes represent an
extensive database allowing the Company to advance towards resource estimation and potential
project development in the near future. In
August 2020
, GR Silver Mining commenced its drilling
program in the area to investigate extensions to known mineralization and to guide new discoveries,
part of a planned resource estimation in 2021.
SAN MARCIAL PROJECT
San Marcial is a near-surface, high-grade silver-lead-zinc open pit-amenable project. GR Silver
Mining is currently drilling at the San Marcial Project, which contains 36 Moz AgEq (Indicated) and
11 Moz AgEq (Inferred), exploring recently defined new high-grade gold and silver targets along the
project's 6 km mineralized trend. GR Silver Mining is the first company to conduct exploration at San
Marcial in over 10 years. The NI 43-101 resource estimate (San Marcial Project – Resource
Estimation and Technical Report) was completed by WSP Canada Inc. on
March 18, 2019
and
amended on
June 10, 2020
.
Plomosas and San Marcial collectively represent a geological setting resembling the multimillion-
ounce San Dimas Mining District which has historically produced more than 600 Moz silver and 11
Moz gold over a period of more than 100 years.
OTHER PROJECTS
GR Silver Mining's other projects are situated in areas attractive for future discoveries and
development in the same vicinity of Plomosas and San Marcial in the Rosario Mining District.
Mr.
Marcio Fonseca
P. Geo, President & CEO
GR Silver Mining Ltd.
Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in
the policies of the TSX Venture Exchange) accept responsibility for the adequacy or accuracy of
this press release.
Disclaimer for Forward-Looking Information
This press release contains forward-looking statements and information that are based on the
beliefs of management and reflect the Company's current expectations. When used in this press
release, the words "estimate", "project", "belief", "anticipate", "intend", "expect", "plan", "predict",
"may" or "should" and the negative of these words or such variations thereon or comparable
terminology are intended to identify forward-looking statements and information.
Such statements and information reflect the current view of the Company. Risks and uncertainties
may cause actual results to differ materially from those contemplated in those forward-looking
statements and information. By their nature, forward-looking statements involve known and
unknown risks, uncertainties and other factors which may cause our actual results, performance or
achievements, or other future events, to be materially different from any future results,
performance or achievements expressed or implied by such forward-looking statements.
SOURCE
GR Silver Mining Ltd.
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For further information:
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CO: GR Silver Mining Ltd.
CNW 07:30e 16-SEP-20