Mines and Mineral Deposits of Mariposa County, California - Mariposa county lies in the heart of the Motherlode and is primarily known for its rich gold mines but has many other minerals as well. The county is also known for its beautiful scenery such as Yosemite Valley. However this valley is surrounded by mineral rich deposits on all sides. This report long out of print covers the 100's of mines and mineral deposits of this county. Now back in print by Sylvanite Publishing.