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Chalcopyrite (/ ˌkælkəˈpaɪˌraɪt, - koʊ -/ [7][8] KAL-kə-PY-ryte, -koh-) is a copper iron sulfide mineral and the most abundant copper ore mineral. It has the chemical formula CuFeS 2 and crystallizes in the tetragonal system. It has a brassy to golden yellow color and a hardness of 3.5 to 4 on the Mohs scale.
In the United States, copper mining has been a major industry since the rise of the northern Michigan copper district in the 1840s. In 2017, the US produced 1.27 million metric tonnes of copper, worth $8 billion, making it the world's fourth largest copper producer, after Chile, China, and Peru. Copper was produced from 23 mines in the US.
Pentlandite, but primarily chalcopyrite and PGEs, are also obtained from the supergiant Norilsk nickel deposit, in trans-Siberian Russia. The Sudbury Basin in Ontario, Canada, is associated with a large meteorite impact crater. The pentlandite-chalcopyrite-pyrrhotite ore around the Sudbury Structure formed from sulfide melts that segregated ...
English: Millerite, Chalcopyrite, Calcite Locality: US 27 roadcut, Halls Gap, Lincoln County, Kentucky, USA (Locality at mindat.org) Size: 3.4 x 3.2 x 2.2 cm. An exposed geode lined with beige Calcite crystals is host to some small, bright metallic needles of the well known Nickel Suflide, Millerite.
This is a list of Superfund sites in Kentucky designated under the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) environmental law. The CERCLA federal law of 1980 authorized the United States Environmental Protection Agency (EPA) to create a list of polluted locations requiring a long-term response to clean up hazardous material contaminations. [1]
Bornite is an important copper ore mineral and occurs widely in porphyry copper deposits along with the more common chalcopyrite.Chalcopyrite and bornite are both typically replaced by chalcocite and covellite in the supergene enrichment zone of copper deposits.
Warren County. The term Western Coalfield (or Western Coal Field) is used to define the region with Pennsylvanian-age strata, largely sandstone and shale, in contrast to the Mississippian -age limestone of the adjoining and older Pennyroyal region. A transitional zone, generally defined as being part of the coalfield, is the Clifty Area, where ...
This site is the center piece of the University of Kentucky's Adena Park and is located on a bank 75 feet (23 m) above Elkhorn Creek.It features a causewayed ring ditch with a circular 105-foot (32 m) diameter platform, surrounded by a 45-foot (14 m) wide ditch and a 13-foot (4.0 m) wide enclosure with a 33-foot (10 m) wide entryway facing to the west.