Precious Metals
May 24, 2022

GR Silver Mining (TSX.V: GRSL)

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Continues To Deliver Wide, High-Grade Drill Results At Plomosas: 6.5 M At 1,458 G/T Ag Including 0.9 M At 3,118 G/T Ag

GR Silver Mining Ltd. ("GR Silver Mining" or the "Company") (TSXV: GRSL) (OTCQB: GRSLF) (FRANKFURT: GPE) – announces high-grade silver (Ag) results from underground infill drilling at the Plomosas Project in Sinaloa State, Mexico. The results continue to support the potential to increase Ag grades in the Plomosas Mine Area resource. The drilling targeted high grade Ag mineralization in the upper levels of the underground workings, in areas where unsampled intervals from historical drill holes within the 2021 resource block model were previously assigned zero values.

Figure 1: Longitudinal Section Plomosas Mine Infill Drilling Results – Ag Block Model (CNW Group/GR Silver Mining Ltd.)
Figure 2: Plomosas Mine – Planned Underground Infill Drilling (CNW Group/GR Silver Mining Ltd.)
Figure 3: Core Photo Detail – High-grade Ag Mineralization Hole PLIP22-13 (CNW Group/GR Silver Mining Ltd.)


  • Core drilling, in un-mined shallow areas (up to 160 m below surface) of the historical Plomosas Mine, continues to define attractive wide and high-grade Ag mineralization.
  • Presence of high-grade results with predominance of Ag mineralization only in areas with potential to increase Ag grade in planned update of resource model, including:
  • PLIP22-013: 6.5 m at 1,458 g/t Ag (1,485 g/t AgEq), including
                        0.9 m at 3,118 g/t Ag (3,266 g/t AgEq)
  • PLIP22-012: 14.0 m at 146 g/t Ag, including
                        0.4 m at 2,474 g/t Ag (2,542 g/t AgEq)
  • PLIP22-011: 2.9 m at 190 g/t Ag, including  
                        0.4 m at 626 g/t Ag
  • PLIP22-010: 8.3 m at 100 g/t Ag
  • Ag mineralization on the hanging wall of the main polymetallic Plomosas Breccia, in the upper levels of the underground workings, supports the upside potential for Ag grades in the mineral resource update scheduled for Q1|23.
  • The combination of systematic underground mapping, 3D modelling of different styles of mineralization and underground infill drilling at the historic Plomosas Mine has defined attractive, wide, high-grade gold-silver (Au-Ag) mineralized zones. These new zones will be incorporated into the upcoming mineral resource block model and estimation.
  • Recent Ag drill results provide encouragement for the Company to continue drilling underground at the Plomosas Mine Area in 2022 (Figure 1) with the objective of significantly increasing the Ag grade in areas of the resource model
GR Silver Mining Chairman and CEO, Eric Zaunscherb commented, "The 2022 infill drill program at the Plomosas Mine has been carefully designed to address upside potential in the resource block model. It has been our thesis that historical sampling lacked detail in some unmined areas resulting in the adoption of zero grade in unsampled drill hole intervals in the current resource model. This is supported by the observation that current resource model grades in areas already mined are lower than suggested by historical production grades. Further, it is very encouraging to see such high-grade Ag results confirming the existence of new, high-grade Ag zones associated with previously ignored cross-cutting structures. It is highly satisfying to see further proof of concept on both themes, with the potential for a commensurate re-rating."

Plomosas Mine Area - Resource Expansion Program

The underground infill drilling program at the Plomosas Mine Area commenced in March 2022 and is ongoing. The drill holes are predominantly short holes planned to target zones where recent geological mapping identified opportunities to improve the 2021 NI 43-101 mineral resource block model Ag grade, utilizing areas of the underground development that provide good access.

Underground Infill Drilling - Plomosas Mine

The underground drilling program is designed to, not only address the shortcomings in the 2021 resource model, but also delineate high-grade Ag-Au mineralized zones located between level 775 RL and 1025 RL (see Figure 2). The underground infill drilling program has a surgical approach using drill rigs with the capacity to drill NQ and BQ diameter holes in selective and tight underground sites, aiming to drill a total of 4,350 m by Q4|22.

The existing underground infrastructure within the Plomosas Mine, which includes a total of 7.4 km of ramps and galleries, provides flexibility and optimization of the program scheduling, avoiding the need for additional new underground development or long drill holes from surface.

A total of 13 holes have been completed underground to date in 2022. Major highlights from the initial 13 holes are summarized in Table 1. These intervals confirm consistent high-grade Ag mineralization and have also delineated new mineralized zones in areas not previously drilled. Upon completion of the underground infill drill program in Q4|22, the Company anticipates commencing a resource upgrade for the Plomosas Mine Area.

Underground Infill Program – Discussion of Results

The drill holes PLIP22-10, PLIP22-11, PLIP22-12 and PLIP22-13 have successfully discovered wide, high-grade Ag mineralization hosted by hydrothermal breccias (Figure 3) located in the hanging wall of the previously mined polymetallic (Ag-Au-Pb-Zn) hydrothermal Plomosas Breccia.

This recently mapped zone is located in a section of the Plomosas Mine where the Company initially defined prospective NE-trending faults with potential to host additional Ag-Au only mineralization. These zones were not previously the subject of significant exploration due to the focus on base metals in the historical plant flowsheet. Historical production, and hence exploration, targeted Pb-Zn rich mineralization at the Plomosas Mine.

The drill holes from PLIP22-01 to PLIP22-09 (Table 1) consistently intersected high grade Ag-Au mineralization hosted in a polymetallic (Pb-Zn) hydrothermal breccia. All nine holes indicate the presence of multiple hydrothermal zones with Ag results generally >200 g/t Ag and individual Au grades up to 4.5 g/t Au in locations drilled along strike on the 1025 RL level.

Dislcaimer GR Silver is a paid marketing client*

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