Excelsior Mining Corp. commenced mining operations at the Gunnison Copper Project in southern Arizona. Following a comprehensive commissioning program that has been ongoing for several weeks, regulatory approval to commence mining operations through the injection of acid was recently received from the Environmental Protection Agency. Delivery of mining fluids to the copper ore body has commenced; fluids will now circulate through a closed-loop system until the concentration of copper held in solution meets sufficient grade to be treated through the Johnson Camp processing facilities to then extract copper and produce copper cathode sheets. First copper cathode sales are expected in first quarter of 2020.