Plumbago Mine Mill Explore Real California Gold Mines!
June 18, 2017. The mighty Plumbago Mine (aka lower Plumbago) and Stamp Mill has a long and rich history. Millions of dollars of high grade have been pulled from small pockets throughout intermittent intervals since the 1860s. Consisting of old workings along the outcrop a 6 foot vein is followed by five tunnels at intervals of 100 feet on the dip.