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A copper axe found at Prokuplje, Serbia contains the oldest securely dated evidence of copper-making, c. 5500 BC (7,500 years ago). [16] The find in June 2010 extends the known record of copper smelting by about 800 years, and suggests that copper smelting may have been invented in separate parts of Asia and Europe at that time rather than ...
Copper can be found in over 160 different minerals, [7] but mining activities are entailed to obtain them in large quantities if a reasonable amount of copper is wanted. Some of the most commonly exploited minerals are cuprite , malachite , azurite , chalcopyrite , chrysocolla and tennantite ; e.g. malachite was extracted in Rudna Glava (Serbia ...
In humans, copper is found mainly in the liver, muscle, and bone. [11] The adult body contains between 1.4 and 2.1 mg of copper per kilogram of body weight. [12]
Copper is essential in the aerobic respiration of all eukaryotes. In mitochondria, it is found in cytochrome c oxidase, which is the last protein in oxidative phosphorylation. Cytochrome c oxidase is the protein that binds the O 2 between a copper and an iron; the protein transfers 4 electrons to the O 2 molecule to reduce it to two molecules ...
Native copper is an uncombined form of copper that occurs as a natural mineral. Copper is one of the few metallic elements to occur in native form , although it most commonly occurs in oxidized states and mixed with other elements.
The term Old Copper Complex is used to describe an ancient North American civilization that utilized native copper deposits for weapons, tools, and decorative objects. This society existed around Lake Superior, where they found sources of native copper and mined them between 6000 and 3000 BC. [9]
The Old Copper Complex of the Western Great Lakes is the best known, and can be dated as far back as 9,500 years ago. [4] [1] Great Lakes natives of the Archaic period located 99% pure copper near Lake Superior, in veins touching the surface and in nuggets from gravel beds.
The copper at the mine was found in a 4-foot-thick (1.2 m) bed of sandstone, and the underlying shale, also a few feet thick. [6] These shales and sandstones were given the name Nonesuch shales and sandstones because they were rocks with very fine copper in them. [ 7 ]