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This list of mines in California is subsidiary to the list of mines article and lists working, defunct and future mines in the U.S. state of California. It is organized by the primary mineral output. For practical purposes stone, marble and other quarries may be included in this list.
In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
It contains 8% to 12% rare-earth oxides, mostly contained in the mineral bastnäsite. [5] Gangue minerals include calcite, barite, and dolomite. It is regarded as a world-class rare-earth mineral deposit. [3] The metals that can be extracted from it include: [6] cerium, lanthanum, neodymium, [7] and europium.
Gold Fields and Santa Fe Pacific Gold Corporation, which had given steady employment to approximately 300 persons, contributed heavily to public and private needs and operated with full environmental issues until it was acquired by New Gold Inc. In 2001, the mine closed due to a fall in gold prices, but it was reopened in 2007.
Colemanite (Ca 2 B 6 O 11 ·5H 2 O) [6] or (CaB 3 O 4 (OH) 3 ·H 2 O) [4] is a borate mineral found in evaporite deposits of alkaline lacustrine environments. Colemanite is a secondary mineral that forms by alteration of borax and ulexite.
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Hanna also acquired interests in mineral companies in Latin America as well as beginning the mining of nickel in Oregon and silicon in Washington. In 1958 Hanna's subsidiary, the Hanna Coal & Ore Company, became the independent Hanna Mining Company while M. A. Hanna continued with mineral sales and in its investment firm work until liquidation ...
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