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Questa Molybdenum Mine (Questa Mine; Moly Mine; R and S Mine), Questa, Taos Co., New Mexico, USA

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Latitude & Longitude (WGS84): 36° 42' 15'' North , 105° 30' 23'' West
Latitude & Longitude (decimal): 36.7041666667, -105.506388889

A molybdenum-rhenium mine owned by Molycorp, a subsidiary of Unocal Corp. Produced 4,760 tons of Mo in concentrates (1984). In 2011, the mine was declared a superfund site - on June 2, 2014 the mine was declared permanently closed.

Located nine miles from Questa, the mine opened in 1916 as the R&S Molybdenum mine. It was purchased by Molycorp Minerals in 1950 and became a subsidiary of Chevron in 2005. Formerly an open pit excavation, the Chevron Questa mine had operated as an underground mine since 1982.

Mineral List

26 valid minerals.

The above list contains all mineral locality references listed on 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 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.


Schilling, J. H. (1956) Geology of the Questa Molybdenum Mine Area, Taos County, New Mexico. New Mexico Bureau of Geology and Mineral Resources Bulletin 51.

Clark, K. F. and C. B. Read (1972), Geology and Ore Deposits of Eagle Nest area, New Mexico. New Mexico Bureau of Geology and Mineral Resources Bulletin 94.

Mining Annual Review (1985): 118 & 331.

Cline, Jean S. & Bodnar, Robert J. (1994): Direct evolution of brine from a crystallizing silicic melt at the Questa, New Mexico, molybdenum deposit. Economic Geology 89, 1780-1802.

Northrop, S.A. and LaBruzza, F.A. (1996), Minerals of New Mexico, revised Third Edition.

Campbell, A.R., and Lueth, V.W. (2008): Isotopic and textural discrimination between hypogene, ancient supergene, and modern sulfates at the Questa Mine, New Mexico. Applied Geochemistry 23, 308-319.

Junxing Zhao, Kezhang Qin, Guangming Li, and Jinxiang Li (2011): Characteristics of alteration and mineralization in the Sharang porphyry molybdenum deposit in the northern margin of Gangdese and comparison with typical porphyry molybdenum deposits in the world. Geology and Exploration 47(1), 54-70.

DeMark, Ramon S. (2015): Minerals of the Questa Moly Mine, Taos County, New Mexico. 36th Annual New Mexico Mineral Symposium Program & Abstracts, page 9.

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