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Scheelore Mine (Scheelore Tungsten deposit; Van Loon Scheelore 8 claims), Mount Baldwin, Mono Co., California, USA

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Latitude & Longitude (WGS84): 37° 31' 34'' North , 118° 50' 51'' West
Latitude & Longitude (decimal): 37.5261111111, -118.8475


A former W mine located in the sec. 12, T5S, R28E, MDM, 0.8 km (2,600 feet) SSE of Mount Baldwin (coordinates of record) (on the S flank of the mountain), at 11,500 feet of altitude, on National Forest wildernss land (John Muir Wilderness). Produced in 1942 - 1944. The last work was carried out in 1954. MRDS database stated accuracy for this location is 10 meters.

NOTE: The coordinates presented in the MRDS database placed this mine in the next section E of its location. The coordinates provided in this file are based on the coordinates for deadon the mine symbol specifically labeled as the Scheelore Mine on the topo map.

Mineralization is hosted in marble/skarn. The ore bodies have a steep dip. The ore bodies are separated by talus and glacial till that covers the contact between granodiorite and marble for 900 feet. The northern ore body (No. 3) is exposed for a length of 230 feet, may contain pyrite, pyrrhotite and garnet at depth. The average width is 10 feet with a content of an estimated 1% WO3. The south ore bodies, No. 2, is 125 feet long,and 3 feet wide. Ore body No. 1 has two shoots. One shoot is 150 feet long and 5 feet wide, the other is 100 feet long and 4 feet wide. Local rocks include Carboniferous marine rocks, unit 7 (Bishop).

Workings include surface openings comprised of surface pits and trenches.

Production data are found in: Lemmon, D.M.

The No. 3 ore body yielded 1,140 pounds of W. Talus material at the No. 3 is 0.25 to 0.50% WO3. Most of the scheelite was produced from this talus. Little Au was present. The N side of the ridge is another tactite body that contained 0.25% WO3, and was not worked as of 1944 (?). The No. 2 contained 1% WO3, and the No. 1, with 2 shoots, had one shoot at 2% WO3, and 1% WO3 in the other. Some ore is high-grade. 5 tons of sorted ore contained 11.33% WO3.

In 1954, several truckloads of tactite was shipped to the Pine Creek mill of the Union Carbide Nuclear Co.

Mineral List


16 valid minerals.

The above list 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

Lemmon, Dwight Moulton (1941c), Tungsten deposits in the Sierra Nevada near Bishop California: USGS Bulletin 931-E: 100, Pl. 14.

Partridge, John F., Jr. (1941), Tungsten resources of California: California Journal of Mines and Geology, California Division of Mines (Report 37): 37(2): 581.

Jenkins, Olaf Pitt (1942), Tabulation of tungsten deposits of California to accompany Economic Minerals Map no. 4: California Division Mines (Report 38): 38 (3&4): 339.

Bateman, P. C. (1951). The Scheelore tungsten mine, Mono County, California (No. 51-196). sn,. USGS open file report 51-0196

U. S. Bureau of Mines Minerals Yearbook 1952 (1952): 3: 146.

Lemmon, Dwight Moulton and Tweto, O.L. (1962) Tungsten in the United States, exclusive of Alaska and Hawaii. USGS Mineral Investigative Resources Map MR-25. (USGS MAP MR-258 NO. 51 per 1 MRDS file).

Rinehart, Charles Dean & Donald C. Ross (1964), Geology and mineral deposits of the Mount Morrison quadrangle, Sierra Nevada, California: USGS PP 385, 106 pp.: 93, 96-97, Pl. 1.

Murdoch, Joseph & Robert W. Webb (1966), Minerals of California, Centennial Volume (1866-1966): California Division Mines & Geology Bulletin 189: 107.

Morgan, B.A. (1975) Mineralogy and origin of skarns within the Mount Morrison pendant, Sierra Nevada, California. American Journal of Science: 275: 121, 125.

U.S. Bureau of Mines Open-File Report MLA 2-81 (1981): Table 1, No. 7, p. 13 and No. 5, figure 1.

Johnson, F.L., et al (1985), Mineral Resources of the John Muir Wilderness, Fresno, Inyo, Madera, and Mono Counties, California: U. S. Bureau of Mines unpublished file report. No. 64 (on file at USBM WFOC, Spokane, WA): Pl. 1, map No. 22.

Pemberton, H. Earl (1983), Minerals of California; Van Nostrand Reinholt Press: 126, 336, 339, 387, 397, 483, 497.

USGS (2005), Mineral Resources Data System (MRDS): U.S. Geological Survey, Reston, Virginia, loc. file ID #10008603, 10188502 & 10031525.

U.S. Bureau of Mines, Minerals Availability System (MAS) file ID #0060510159.

Lemmon, D.M., Tungsten deposits in the US; Vol. I, unpublished data: 301-303.

Defense Minerals Exploration Administration (DMEA) Reports Index California-Nevada, DMA No. 1376: 5.

 
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