GR Silver Mining plans massive sampling test at Plomosas

The program is advancing in the Rosario Mining District in Sinaloa.

GR Silver Mining Ltd. announced that it has advanced underground development and bulk sample test mining (BSTM) at the San Juan Area, Plomosas project in Mexico.

The BSTM program is advancing under a commercial agreement with private local operators (mining and milling operators) in the Rosario Mining District in Sinaloa.

The company has achieved the following milestones:

• To date, 280 m of underground development has been completed and 15,170 t of BSTM material has been processed from the San Juan Area, from which 235 t of concentrate has been produced.
• Processing of BSTM material from the San Juan area has resulted in silver recoveries ranging from 84% to 92% and gold recoveries ranging from 60% to 75%. The BSTM program has enabled the processing of high-grade silver- and gold-bearing lead concentrates that are commercially acceptable to buyers.
• Work at the site supports the definition of a high-grade silver-gold zone not represented in the current NI 43-101 mineral resource estimate, allowing for better delineation of key geological controls hosting significant mineralization for future drilling.
• The channel sampling programme, as part of the BSTM programme, has reported high grade results, including 2.5m at 1,625 g/t Ag and 14.1 g/t Au. This new zone was recently discovered, hosted by a hydrothermal breccia/vein within a NE trending fault zone in the San Juan Area. These structures were not integrated into the current NI 43-101 Mineral Resource estimate, creating potential for future resource expansion in the San Juan Area.
• Subsurface monitoring sampling during the BSTM program and site preparation has revealed new geological structures hosting silver- and gold-rich hydrothermal breccias that were not previously incorporated into the geological model.