Discovery Minerals Ltd.: Discovery Minerals Commences Mining Operations Discovery Minerals Executes Agreement with Sierra Gold LLC to acquire the Ruby Mine in California and has commenced preliminary work. GRASS VALLEY, CA / ACCESSWIRE / April 13, 2021 / Discovery Minerals LTD (OTC PINK:DSCR), is an acquisition and development company that targets natural resource properties and cutting edge technology opportunities is pleased to announce that it has completed an agreement to acquire the Ruby Mine from Sierra Gold LLC. Discovery's geologists have commenced generating a 3-D model of the property and workings as well as geological evaluation and assessment of all known existing resource targets.