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Opal is a hydrated amorphous form of silica (SiO 2 · n H 2 O); its water content may range from 3% to 21% by weight, but is usually between 6% and 10%. Due to its amorphous property, it is classified as a mineraloid, unlike crystalline forms of silica, which are considered minerals. It is deposited at a relatively low temperature and may occur ...
Buffer zone. 268,057.2 ha (662,384 acres) El Camino Real de Tierra Adentro (English: The Royal Road of the Interior Land), also known as the Silver Route, [1] was a Spanish 2,560-kilometre-long (1,590 mi) road between Mexico City and San Juan Pueblo (Ohkay Owingeh), New Mexico (in the modern U.S.), that was used from 1598 to 1882. It was the ...
La Negra is a silver mine in Querétaro, Mexico. [1] The mine has thirteen known ore bodies, overwhelmingly of silver, but also with smaller quantities of gold, zinc and lead. [2] The mine has a processing mill that can process 3,000 tons-per-day. [3] Tailings from the mine are held behind five tailings dams. [1]
John Loughead. . (m. 1886) . ; Mr. Guttierez. Flora Haines Loughead (later, Flora Gutierrez; 1855–1943) was an American writer, farmer, and miner from Wisconsin. She became the "Opal Queen" of Virgin Valley. [1] Flora's son Allan was the founder of American aerospace company the Lockheed Corporation.
3. Bonanza Opal Mine. Nevada. Bonanza Opal Mine in Nevada’s Virgin Valley is the ideal destination if you’re looking to combine treasure hunting with a little rest and relaxation. The mine ...
805 & 820. GNIS feature ID. 1660894 [1] Las Cruces (sometimes rendered Las Cruses, meaning the crosses in Spanish) [2] is a former settlement and an archaic placename in Santa Barbara County, California. [1] It lies at the split between California State Route 1, which travels north to Lompoc, and U.S. Route 101, which travels north to Buellton.
The Opal mines are located in the Northern valley. [1] The Virgin Valley has mines that are rich in opals. The opals were discovered in about 1913. [2] The richest mines were owned by Flora Haines Loughead who had been a writer and a farmer but bought a string of claims after being sent to do a story for the San Francisco Chronicle. [3]
There are thirteen principal mining areas: Tlalpujahua, Angangueo, Los Azufres, Real de Otzumatlán, Tzitzio, Tiámaro, El Bastán, San Diego Curucupacéo, Inguarán, Las Truchas, and La Minita de Coalcomán. Michoacán is the second-largest producer of coke and third-largest producer of iron, which are essential to the steel industry, in Mexico.