Precious Metals
December 13, 2022

GR Silver Mining (TSX.V: GRSL)

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Intersects High-Grade Gold On The Hanging Wall In Plomosas Mine Area

GR Silver Mining (TSXV: GRSL) (OTCQB: GRSLF) (FRANKFURT: GPE) – is pleased to announce additional drilling results in the Plomosas Mine Area as part of the 2022 infill drilling and sampling program at the Company's wholly-owned Plomosas Project in Sinaloa, Mexico. The drilling had two objectives:

  • Drilling at specific locations inside the historic mine where previous resource modelling and estimation adopted zero grades for unsampled core intervals from historical drilling, and
  • Define the geometry and boundaries of new gold mineralization on the hanging wall of the main mineralized zone at lower levels of the underground mine.

The Company expects anticipated drilling in the Plomosas Mine Area to be completed by the end of December 2022 for data to be incorporated into the 3D geological model, for the updated resource estimation expected to be published in Q1|2023.

Highlights from the Plomosas Mine Area drill holes (Down hole widths):

  • PLIP22-28: 7.3 m at 1,242 g/t AgEq[1] (55 g/t Ag, 8.66 g/t Au, 2.7% Pb, 6.6% Zn and 0.5% Cu)
  • PLI17-26:    12.4 m at 2.64 g/t Au, including 0.4 m at 57.9 g/t Au
  • PLI22-42:    21.1 m at 489 g/t AgEq (28 g/t Ag, 3.60 g/t Au, 0.6% Pb, 2.3% Zn and 0.2% Cu)
  • PLI22-47:    7.1 m at 970 g/t AgEq (281 g/t Ag, 2.15 g/t Au, 8.9% Pb and 6.0% Zn)
  • PLI22-46:    6.4 m at 940 g/t AgEq (44 g/t Ag, 1.90 g/t Au, 11.2% Pb, 10.0% Zn and 0.1% Cu)

The infill drilling program at the Plomosas Mine Area continues to provide information for the Company to enhance the geological model and confirm the presence of high-grade structures on the hanging wall and footwall of the main mineralized breccia. Gold mineralized zones exceeding 20 m down hole width have been drilled in the current program in both the hanging wall and footwall. Multiple drill hole intervals with high-grade veinlets have been intersected in these zones, as evidenced by the 0.4 m at 57.9 g/t Au from hole PLI17-26.

GR Silver Mining Chairman and CEO, Eric Zaunscherb comments, "As GR Silver's team peeled the geological onion, the importance of cross structures in the overall Plomosas story was revealed. Our most recent results confirm that younger, crosscutting structures appear to be contributing additional precious metals mineralization in the main polymetallic Plomosas Breccia and beyond into its hanging wall and footwall. The intersection of high-grade gold mineralization is an important addition to the Plomosas story that may contribute to the resource update anticipated in the next few months. Regardless, the emerging understanding of controls on high-grade mineralization has already had a material impact on drilling success at the Plomosas Project, as well as how the project is viewed."

Figure 1:   Longitudinal Section: Plomosas Mine Area (Au Block Model and Grades)

GR Silver Mining will complete the infill drilling program at the Plomosas Mine Area by year end to receive the assays in early 2023. Upon completion, this program will add 11,750 m of core drilling (186 holes) in specific areas of the existing NI 43-101 resource block model, designed to:

  • Replace historical holes in the previous resource estimation where zero grades were applied due to historical selective sampling. The immediate benefit is that infill drilling completed in the Plomosas Breccia, as well as exploring further into the hanging wall and footwall of the main mineralized zone, may potentially enhance the silver ("Ag") and gold ("Au") grade distribution in the upcoming resource block model;
  • Target the discovery and delineation of high-grade precious metal mineralized zones hosted by structures cross cutting the main mineralized zone;
  • Drill in the vicinity of the main Ag-Au-Pb-Zn breccia in a series of unmined locations inside the historical Plomosas Mine Area, where recent structural geological mapping revealed new structures hosting wide mineralization close to existing underground development; and
  • Test new models developed following the first-ever detailed geological-structural mapping on the Plomosas Mine Area with potential to successfully intersect additional high-grade Ag-Au mineralized zones.


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