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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!

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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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