GR Silver Mining Ltd. reported wide and high-grade drill results from the Company's underground core drilling program in the Plomosas Mine Area, as well as validation sampling results from historic drilling, at its 100%-owned Plomosas Silver Project ("Plomosas Project") in Sinaloa, Mexico. The underground drilling program is targeting bulk tonnage-style mineralization in the Plomosas Mine Area (following the Company's recent discovery at level 775, approximately 250 m below surface) aiming to delineate high margin precious and base metals mineralization with potential for large tonnage and scalability. The successful underground exploration drilling program at the Plomosas Mine Area has discovered extensions to the wide mineralization previously sampled at level 775, both below, and laterally to, previously mined areas. The mineralization is represented by thick intercepts of Au-Ag-Pb-Zn-Cu mineralization hosted in a series of hydrothermal breccias. Drill intercept highlights from recently completed hole PLI20-042 include: 83.0 m at 420 g/t AgEq (2.52 g/t Au, 33 g/t Ag, 0.9 % Pb, 2.9 % Zn and 0.3 % Cu, from 98.0 to 181.0 m), including: 4.0 m at 1,319 g/t AgEq (9.35 g/t Au, 38 g/t Ag, 0.4 % Pb, 10.5 % Zn and 0.3 % Cu); and 11.0 m at 1,596 g/t AgEq (9.41 g/t Au, 135 g/t Ag, 5.7 % Pb, 9.8 % Zn and 0.5 % Cu). Two oriented underground core drill holes (PLI20-03, PLI20-04), drilled by GR Silver Mining, have provided important geological, structural and mineralization data, thus aiding the interpretation of these wide, high-grade zones. This data is assisting in the investigation of additional broad zones of sulphide-rich (sphalerite, galena and chalcopyrite) mineralization hosted in structurally controlled hydrothermal breccias in the Plomosas Mine Area (link to core photos). Four historic underground drill holes (PLI17-05, PLI17-08, PLI17-15 and PLI17-16), located nearby, were also validated with new sampling by GR Silver Mining. All data and additional new sample results are being incorporated into a 3D geological model. The drill hole PLI20-04 represents a 25 m step-out from the previously released high grade discovery at the deepest level (775m RL) of the Plomosas Mine Area. The step-out area displays an intersection of two fault systems: the low angle N-S trending Plomosas Fault and high angle NE oriented faults. The wide mineralized zone is mainly comprised of high-grade Au-Ag-Pb-Zn hydrothermal breccia, with late disseminated chalcopyrite (Cu) - pyrite rich veins/veinlets. A pervasive chalcopyrite-pyrite quartz stockwork system is common not only on the footwall, but also on the hanging wall of the mineralized hydrothermal breccia. This system is apparently hosted by the two fault systems and also by specific geological units, oxidized andesites and andesitic tuffs, defining a prospective corridor along strike. A similar style of mineralization was recently mapped in the upper levels of the Plomosas Mine Area and is currently the subject of detailed exploration. Based on the recent underground drilling results, GR Silver Mining is continuing the investigation of all historical underground sampling in order to delineate new zones for drilling, aiming to incorporate all new areas in the upcoming NI 43-101 resource estimation.