GR Silver Mining Ltd. (TSX-V: GRSL) (FRANKFURT: GPE) (OTCQB: GRSLF) is pleased to report a new mineralized zone defined by drill results from the San Juan Area at its 100%-owned Plomosas Silver Project in Sinaloa, Mexico. The new zone called the “Yecora Vein” includes results from the 2020 drilling program as well as a reinterpretation of historical drill results in the same area.
The results confirm the presence of wide and high-grade zones of silver, gold, lead and zinc mineralization, close to the surface in a new mineralized structure paralled to the San Juan Area. In addition to encountering attractive, near surface polymetallic (Ag-Au-Pb-Zn) mineralization at Yecora, gold-hosted veins have been identified indicating new opportunities for shallow drilling. The San Juan Trend now extends for at least 2 km along strike, consisting of at least six mapped veins: San Juan, La Colorada, Yecora, Loma Dorada, La Odisea and San Francisco (Figure1).
|1||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.|
GR Silver Mining President and CEO, Marcio Fonseca, commented, “These results from the Yecora Vein together with our recent 3D modelling of ground IP and airborne magnetic geophysical data provide encouragement for the definition of a much larger epithermal system at San Juan. Since the March 2020 acquisition of the Plomosas Project, the Company has expanded the strike length of the San Juan system from its original 400 m to approximately 2 km, and has demonstrated the presence of at least six mineralized veins (Figure 2). Our ongoing surface drilling program, together with validation of extensive historic drilling data, is providing strong evidence that the mineralized footprint extends beyond the previously drilled areas”.
The progress of the exploration program at San Juan, which includes surface drilling and a review of geochemical and geophysical exploration data, in combination with detailed geological mapping, is expanding the extent of high-grade precious and base metal mineralization. This program has achieved the discovery of new mineralized structures close to the old San Juan mine workings at shallow depth. The Yecora Vein is located to the west of the San Juan Vein and appears to be a splay from the low sulphidation epithermal vein systems mapped in nearby old workings (La Colorada). It has a strike length of at least 500 m and remains open in both directions.
Highlights of the Yecora Vein in the San Juan Area
The mineralized Ag-Au-Pb-Zn veins reported in this news release (Table 1), add to the potential for delineation of near surface polymetallic resources in multiple zones at the San Juan Area.
The Company’s diamond core drilling program at the Plomosas Silver Project is ongoing and includes shallow drill holes from surface, as well as underground drilling inside recently rehabilitated existing developments or old workings. The Company has increased the scale of the drill program at the Plomosas Silver Project from a previously released 4,500 m (see News Release dated 15 July, 2020) to a total of 11,900 m. There are currently five drill rigs on site, including one underground drill rig, as part of the resource expansion and discoveries drill program.
Table 1 summarizes the most significant drill assay results for this set of 29 drill holes released for the Yecora Vein in the San Juan Area.
Table 1: Summary Surface Drill Hole Results – News Release November 23, 2020 (Yecora Vein – San Juan Area)
|Ag g/t||Au g/t||Pb %||Zn %||AgEq
|*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.|
The 29 drill holes in this news release were generated by: (a) GR Silver Mining’s core drilling campaign (YES20-01), and (b) historical drill holes completed by Grupo Mexico, which make up part of an extensive surface and underground diamond core drilling database, that the Company continues to consolidate and validate.
Table 2 provides collar coordinates for the drill holes presented in this news release.
Table 2: Drill Hole Locations – News Release November 23, 2020 (Yecora Vein, San Juan Area)
|Hole No.||East (m)||North (m)||RL (m)||Az.||Dip||Depth (m)|
|All numbers are rounded.|
The Company believes that the San Juan Area represents a large, low sulphidation epithermal system. Our investigations to date have identified evidence of multiple events of mineralization, including a combination of precious and/or base metals in veins, veinlets, stockworks and hydrothermal breccias. This represents an opportunity for the definition of a resource in this area with the shallow surface drilling program to continue discovering new mineralized zones close to the surface.
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
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.
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 Company’s 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.
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.
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.
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