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USA | |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 343. Lindgren, Waldemar (1894a), The gold-silver veins of Ophir, California: USGS 14th. Annual Report, part 2: 273 |
| (2005) Mineral Resources Data System (MRDS), US Geological Survey. |
| Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Logan, Clarence August (1936), Gold mines of Placer County: California Journal of Mines and Geology, California Division Mines (Report 32): 32(1): 23 Van Nostrand Reinholt Press: 84. |
| Pemberton, H. Earl (1983) Minerals of California. Van Nostrand Reinhold Company Inc. Logan, Clarence August (1936), Gold mines of Placer County: California Journal of Mines and Geology, California Division Mines (Report 32): 32(1): 26, 29 Van Nostrand Reinholt Press: 84. |