The people used native copper at first and experimented with different furnaces styles in order to smelt the ore between 2500-1500 BCE ( Ehret 2002 ).
42.
The museum features an extensive mineral collection and exhibits on copper formation, and has the world's best collection of crystallized native copper and native copper in crystallized calcite.
43.
The museum features an extensive mineral collection and exhibits on copper formation, and has the world's best collection of crystallized native copper and native copper in crystallized calcite.
44.
In the 1850s, mining began on stratiform native copper deposits in felsite-pebble conglomerates and in the upper zones of basalt lava flows ( locally called " amygdaloids " ).
45.
Reversing the usual trend in colonization where indigenous technologies are replaced, the Russians adopted the Aleut kayak, or baidarka, sea otter hunting techniques, and the working of native copper deposits.
46.
Although native copper was the dominant ore mineral, chalcocite ( copper sulfide ) was sometimes present, and, especially in the Mohawk mine, copper arsenide minerals such as mohawkite and domeykite.
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Native copper is still a fair percentage of the copper minerals found on earth, and reports from some mining regions of entire mountains made of copper have been known to circulate.
48.
Over thousands of years, Indian costumes were adorned with beads made from shells, clay, bone, stone and native copper; the beads used as currency, called wampum, were cut from clam shells.
49.
Supergene sulfide ores rich in native copper minerals are refractory to treatment with sulfuric acid leaching on all practicable time scales, and the dense metal particles do not react with froth flotation media.
50.
The mines of the Keweenaw native copper deposits of Upper Michigan were major copper producers in the 19th and early 20th centuries, and are the largest deposits of native copper in the world.
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