|Latitude & Longitude (WGS84):||36° 16' 22'' North , 117° 34' 34'' West|
|Latitude & Longitude (decimal):||36.27278,-117.57611|
|Köppen climate type:||BSk : Cold semi-arid (steppe) climate|
A former W mine located 1.4 km (0.9 mile) ENE of Darwin, on the North side of a steep canyon, locally called Custer Canyon. Operated during the period 1950–1955; re-opened in 1960 for a short time. MRDS database stated accuracy for this location is 10 meters. Corrected description and position N36.27283 W117.57615 by Richard Muster, courtesy Gail Dunning, Walt Margerum and Robert Hously.
Rocks in the mine area are interbedded calc-hornfels in part recrystallized to marble and altered to tactite containing veins of scheelite. Local rocks include Carboniferous marine rocks, unit 2 (SE California Carbonate Assemblage).
Workings include underground openings comprised of 3 separate workings, Nos. 1-3, with a 140 foot inclined shaft with drifts and crosscuts and 4 adits. High grade Scheelite was found in the inclined shaft. Only low grade Scheelite was found in the adits. No. 3 adit that was dug to explore for Ag & Pb.
21 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
|Quaternary - Miocene|
0 - 23.03 Ma
|Cenozoic sedimentary rocks|
Age: Cenozoic (0 - 23.03 Ma)
Lithology: Sedimentary rocks
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. 
|Cisuralian - Mississippian|
272.3 - 358.9 Ma
|Carboniferous marine rocks, unit 2 (SE California Carbonate Assemblage)|
Age: Paleozoic (272.3 - 358.9 Ma)
Stratigraphic Name: Anvil Spring Formation; Bird Spring Formation; Tihvipah Limestone; Monte Cristo Limestone; Santa Rosa Hills Limestone; Perdido Group; Stone Canyon Formation; Tin Mountain Limestone; Indian Springs Formation
Comments: Southeastern California carbonate assemblage (eastern Mojave Desert and southeastern Death Valley area). Consists primarily of limestone with minor siltstone and sandstone.Includes some rocks of Early Permian age,
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.