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Turquoise deposits are widespread in North America. Some deposits, such as those of Saguache and Conejos Counties in Colorado [19] or the Cerrillos Hills in New Mexico, [20] [21] are typical supergene deposits formed from copper porphyries. The deposits in Cochise County, Arizona, are found in Cambrian quartzites and geologically young granites ...
Leaders of states in the U.S. which have significant mineral deposits often create a state mineral, rock, stone or gemstone to promote interest in their natural resources, history, tourism, etc. Not every state has an official state mineral, rock, stone and/or gemstone, however.
The rediscovery of the turquoise mines in what would become Crescent is reported to have been made by prospector George Simmons, who first found the deposits in 1889 or 1890 while searching for copper and returned to the area two years later to begin mining upon realizing that he had found turquoise, as recorded by Frank R. Morrissey in a 1968 ...
The Cerrillos Turquoise Mines are Ancestral Puebloan turquoise mines located in the Cerrillos Hills, 20 miles (32 km) southwest of Santa Fe, New Mexico. Archeologists believe that most of the turquoise found at Chaco Canyon was mined in the Cerrillos Hills.
Under Spanish rule turquoise and lead were mined near Cerillos and copper was found at Santa Rita in the southwest in 1798. Artisanal mining for placer gold took place after an 1821 discovery in the Ortiz Mountains south of Santa Fe. New deposits, along with the reopened Spanish mine in Silver City prompted a boom in copper mining in the late ...
The Mazama Ash (formally named the Mazama Member in some areas) [1] is an extensive, geologically recent deposit of volcanic ash that is present throughout much of northern North America. The ash was ejected from Mount Mazama , a volcano in south-central Oregon , during its climactic eruption about 7640 ± 20 [ 4 ] years ago when Crater Lake ...
Within the basin, deposits valuable for lead, zinc, coal balls and fluorite are mined in Hardin and Pope counties, Illinois, and Crittenden and Livingston counties, Kentucky. the deposits are in the form of veins and limestone replacement deposits in Mississippian sedimentary rocks. Ore minerals are fluorite, galena, and sphalerite.
Little is known about the history of the oldest exposed rocks in the area due to extensive metamorphism.This somber, gray, almost featureless crystalline complex is composed of originally sedimentary and igneous rocks with large quantities of quartz and feldspar mixed in. [1] The original rocks were transformed to contorted schist and gneiss, making their original parentage almost unrecognizable.