A former Cu-Zn-Ag-Au-Pb mine located in secs. 3 & 4, T4N, and in secs. 33 & 34, T5N, R10E, MDM, 1 mile WNW of Campo Seco.
Mineralization is a replacement deposit (model # 184: Massive sulphide, kuroko), hosted in Amador Group rocks/M to L (schist, greenstone).
Local structures include faults of 3 categories: 1. Generally steeply-dipping faults, strike NE, with little effect on the ore body; 2. Low-angle reverse faults, N30W - N30E, 25-55E; 3. High-angle, along certain schistosity planes or at contacts. Folds plunge from 60S to 85N.
Local tectonic structures include an island arc.
Production data are found in: Clark, W.B. & Lydon, P.A. (1962).
References
Schaller, Waldemar Theodore (1904), Notes on some California minerals: American Journal of Science, 4th. Series: 17: 191-194.
Logan, Clarence August and Franke, H. (1936), Mines and Mineral Resources of Calaveras Co.: California Division of Mines, California Journal of Mines & Geology, California Division of Mines: 32(3).
Heyl, George Richard, Cox, M.W. and Eric, J.H. (1948a) Penn zinc-copper mine, Calaveras County, California. California Division Mines Bulletin 144: 61-84.
Clark, Wm. B. & P.A. Lydon (1962), Mines and mineral resources of Calaveras County, California: California Division of Mines & Geology County Report 2; [… Geological Society of America Proceedings, 1933: 312-313, 1934]: 28-31.
Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 161.
Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 48, 82, 93, 96, 99, 133, 292, 297.
Economic Geology: 83: 419-427.
Mineral List
Mineral list contains entries from the region specified including sub-localities
Penn Mine (Happy Jack; West Constellation; Satellite; Big Satellite; Hinkcley; Blue Jay; Meteor; Hecla; Little Satellite; Copper Hill; Penn Chemical Works; Campo Seco)
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