GR Silver Mining (CVE: GRSL- OTCQB: GRSLF) CEO Mario Fonseca joined Steve Darling from Proactive to share some impressive results from the San Juan Area of their Plomosas Project.Fonseca telling Proactive about the numbers and why he feels this area will be very key and that’s why they plan on focusing on the Plomosas Mine Area and San Juan Area which represent two areas at resource estimation stage.