Golden Summit Mine (Westcott Mine), Table Mountain, Golden Summit District, Butte Co., California, USA
|Latitude & Longitude (WGS84):||40° 0' 35'' North , 121° 25' 27'' West|
|Latitude & Longitude (decimal):||40.00972,-121.42417|
|Köppen climate type:||Csb : Warm-summer Mediterranean climate|
A former lode Au mine located in the E½ sec. 20 in the S½NW¼ (estimated) sec. 21, T25N, R5E, MDM, 3.6 km (2.2 miles) N of Table Mountain (coordinates of record) (2 miles W of Spring Valley Lake), on National Forest land. The property consists of a 320 acre patent. MRDS database stated accuracy for this location is 1,000 meters.
Mineralization is a vein deposit hosted in syenite and greenstone. The ore body is ribbon-shaped, strikes N66E and dips 90 at a thickness of 8 feet, and is situated between the syenite and greenstone. Local rocks include Tertiary volcanic flow rocks, unit 17 (Cascade Range) and/or Paleozoic marine rocks, undivided, unit 6 (Northwestern Sierra Nevada).
Workings include underground openings. Development in 1895 consisted of an 250 foot incline tapped at 100 foot of depth by a 400 foot drain tunnel. Drifts run 400 feet E and 400 feet W on the 100 level. Drifts also run 300 feet E and 250 feet W on the 200 level.
2 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
|Jurassic - Permian|
145 - 298.9 Ma
|Paleozoic marine rocks, undivided, unit 6 (Northwestern Sierra Nevada)|
Age: Phanerozoic (145 - 298.9 Ma)
Stratigraphic Name: Calaveras Complex (part); Clipper Gap Formation; Horseshoe Bend Formation
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052. 
Lindgren, Waldemar (1911), The Tertiary gravels of the Sierra Nevada of California: USGS Professional Paper 73, 226 pp.: 97.
Waring, Clarence A. (1915), Mines and Mineral Resources of Butte County: California Journal of Mines and Geology (Report 15): 15: 217.
O’Brien, J.C. (1949), Mines and mineral resources of Butte County, California: California Journal of Mines and Geology (Report 45): 45(3): 443, Pl. 23.
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10028498, 10162942 & 10103463.
U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060070213.