Scene Design 19th Century Goldsilver mining operations
Oct 18 2020 The Empire Mine in Grass Valley CA had an 80-stamp mill on the property. In its best days it processed 400 tons of ore per day producing about 25 lbs gold. So a single stamp processed 5 tonsday. Morgan Griffiths Mine and Mill Modeling. The mills capacity depended on rock hardness stamp weight and drop frequency. So numbers vary.