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Hemet Magnesite Mine (Hemet Magnesite property), Winchester, Menifee District (Auld District), Riverside Co., California, USA

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Latitude & Longitude (WGS84): 33° 41' 45'' North , 117° 1' 39'' West
Latitude & Longitude (decimal): 33.69584, -117.02776


A magnesite-pegmatite occurrence/mine located in the NW¼ sec. 31, T5S, R1W, SBM, 5.4 km (3.3 miles) ESE of Winchester and 7.8 km (4.8 miles) SW of Hemet, on private (patented) land. MRDS database stated accuracy for this location is 500 meters.

NOTE: USGS MRDS database file #10064424 presents geographic coordinates (33.69643, -116.92169) that place this locality in the wrong sec. 31 (T5S, R1E).

Mineralization is a vein magnesite deposit and pegmatite hosted in serpentinite. The deposit occurs in a stockwork of veins in a belt of serpentinite 200 to 400 feet wide intrusive into micaceous gneiss and schist. Associated rocks include schist and gneiss. Local rocks include Mesozoic granitic rocks , unit 2 (Peninsular Ranges) and/or Jurassic marine rocks, unit 4 (Peninsular Ranges and Western Transverse Ranges).

Workings include surface openings with a length of 76.2 meters, an overall depth of 73.15 meters and overall width of 21.34 meters.

Mineral List


6 valid minerals.

Rock Types Recorded

Entries shown in red are rocks recorded for this region.

Note: this is a very new system on mindat.org and data is currently VERY limited. Please bear with us while we work towards adding this information!



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

Hess, Frank L. (1908b), The magnesite deposits of California: USS Bulletin 355, 67 pp.: 38.

Bradley, W.W. (1925), Magnesite in California: California Mining Bureau. Bulletin 79: 61.

Bradley, W.W. (1936), Thirty-second report of the State Mineralogist: California Division Mines Report 32: 117.

Murdoch, Joseph (1936a), Andalusite in pegmatite: American Mineralogist: 21: 68, 69.

Webb, R.W. (1943), Two andalusite pegmatites from Riverside County, California American Mineralogist: 28: 581.

Tucker, W. Burling & Reid J. Sampson (1945), Mineral resources of Riverside County: California Division Mines Report 41: 145. (?)

Sampson, Reid J. & W. Burling Tucker (1945), Mineral resources of Riverside County: California Journal of Mines and Geology, California Division of Mines and Geology (Report 41): 41(3): 175.

Chesterman, C.W. (1950b), Uranium, thorium and rare-earth elements: California Division Mines Bulletin 156: 362.

Heinrich, Eberhardt William (1950), Cordierite in pegmatite near Micanite, Colorado: American Mineralogist: 35: 178.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 74, 160, 161, 173, 271, 249, 335.

Saul, R.B., Evans, J.R., and Gray, C.H. (1970) Mines and mineral resources of Riverside County. California Division of Mines and Geology County Report 9. Unpublished manuscript: 888.

Pemberton, H. Earl (1983), Minerals of California: 143, 204, 318, 449, 450, 454.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10064424 & 10213142.

U.S. Bureau of Mines Minerals Availability System/Mineral Industry Location System (MAS/MILS): file #0060650377.

 
Mineral and/or Locality  
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