Unnamed W mine , Ocotillo, Imperial Co., California, USA
|Latitude & Longitude (WGS84):||32° 39' 16'' North , 115° 59' 4'' West|
|Latitude & Longitude (decimal):||32.65472,-115.98472|
|Other regions containing this locality:||Sonoran Desert, North America|
|Köppen climate type:||BWh : Hot deserts climate|
A former (past producer) W-abrasives (garnet) mine located 9.4 km (5.8 miles) S of Ocotillo. MRDS database stated accuracy for this location is . NOTE: MRDS conundrum: calls it a "prospect" but states "past producer."
Mineralization is a W deposit (Mineral occurrence model information: Model code: 42; USGS model code: 14a; Deposit model name: W skarn) hosted in limestone and schist. The ore body is a lens 1.22 meters wide and 19.81 meters long. Ore control was a contact zone. Fine- to medium-grained diopside-tremolite-garnet skarn occurs along a contact between tonalite and biotite schist. Scheelite is disseminated in blocks 0.5 inches (1.25 cm) across and in stringers 0.25 inch thick and 3 inches long. Associated rocks include Late Cretaceous tonalite. Local rocks include pre-Cenozoic granitic and metamorphic rocks undivided.
Workings include a trench and an incline (S80W), at 2.44 meters deep and 18.59 meters long, and 7.62 meters long, respectively.
Analytical data results: 2 samples of skarn: 0.43% WO3, 1.46% WO3. 4 other samples had <0.1% WO3.
3 valid minerals.
Rock Types Recorded
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Entries shown in red are rocks recorded for this region.
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
|Late Cretaceous - Paleoproterozoic|
66 - 2500 Ma
|pre-Cenozoic granitic and metamorphic rocks undivided|
Age: to Cretaceous (66 - 2500 Ma)
Stratigraphic Name: Ash Mountain Complex; Placerita Formation; Sur Series
Comments: Southern California, Mojave Desert, Sierra Nevada, central California Coast Ranges
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. 
USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10062394.