Pyrite from Plumas Copper Belt, Plumas County, California, USA
USA | |
| Hamilton, Fletcher Report XVII of the State Mineralogist - Miningh in California During 1920 California State Mining Bureau Jan 1921 |
| Singer, D.A., Berger, V.I., Moring, B.C. (2008) Porphyry copper deposits of the world: Database and grade and tonnage models, 2008. Open-File Report 2008-1155 |
(2005) Mineral Resources Data System (MRDS), US Geological Survey. | |
| Diller, J.S. (1905), Mineral resources of the Indian Valley region, California, USGS Bulletin 260: 45-49. |