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Unnamed W mine [3], Ocotillo, Imperial Co., California, USA

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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.

Mineral List


3 valid minerals.

Rock Types Recorded

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Regional Geology

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



ID: 2839165
pre-Cenozoic granitic and metamorphic rocks undivided

Age: to Cretaceous (66 - 2500 Ma)

Stratigraphic Name: Ash Mountain Complex; Placerita Formation; Sur Series

Description: Granitic and metamorphic rocks, mostly gneiss and other metamorphic rocks injected by granitic rocks. Mesozoic to Precambrian.

Comments: Southern California, Mojave Desert, Sierra Nevada, central California Coast Ranges

Lithology: Major:{plutonic,gneiss}, Incidental:{metasedimentary, metavolcanic}

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. [133]

Data and map coding provided by Macrostrat.org, used under Creative Commons Attribution 4.0 License



This page contains all mineral locality references listed on mindat.org. This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in mindat.org without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.

References

Todd, V.R., Kilburn, J.E., Detra, D.E., Griscom, Andrew, Kruse, F.A., and McHugh, E.L. (1987), Mineral Resources of the Jacumba (In-Ko-Pah) Wilderness Study Area, Imperial County, California: USGS Bulletin 1711-D, 18 pp.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10062394.

Mineral and/or Locality  
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