Our "5" Stamp Mill – Mariposa Museum History Center
Our "5" Stamp Mill . A Joshua Hendy Manufacture 5 stamp (5000 pound ) stamp mill. View from ground level. View from museum porch. This is a five stamp mill used to crush ore (quartz) to particles to the size of sand. Releasing the gold from the quartz. Each stamp weighs 1,000 pounds and drops 8 inches 100 times per minute for a total weight ...