Mother Lode Northern Explore Real California The Eby Stamp Mill is an example of the type of facility used in hard rock gold mining to crush ore It is one of the few stamp 0 Mother Lode Northern September 27 2017 Malakoff Diggins State Historic Park Malakoff Diggins is California s largest hydraulic gold mine There are no shafts except for massive drain tunnels because the gold was dug up by using high pressure water