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This list of deepest mines includes operational and non-operational mines that are at least 2,224 m (7,297 ft), which is the depth of Krubera Cave, the deepest known natural cave in the world.
Copper is a fairly common element, with an estimated concentration of 50–70 ppm ... Deep-sea nodules are estimated to contain 700 million tonnes of copper.
Porphyry copper deposits represent an important resource and the dominant source of copper that is mined today to satisfy global demand. [6] Via compilation of geological data, it has been found that the majority of porphyry deposits are Phanerozoic in age and were emplaced at depths of approximately 1 to 6 kilometres with vertical thicknesses on average of 2 kilometres. [6]
Copper(II) gives a deep blue coloration in the presence of ammonia ligands. ... [98] [99] [100] A copper spearpoint found in Wisconsin has been dated to 6500 BC. [98]
Within the first year of operation, the pit extracted 17,000 tons of ore per day at a grade of 0.75% copper. Ultimately, about 1,000,000,000 tons of material were mined from the Berkeley Pit. Copper was the principal metal produced, although other metals were also extracted, including silver and gold. [8]
The mine began production in fall 2014 and is expected to produce 440 million pounds of nickel, 429 million pounds of copper and small amounts of other metals (platinum, palladium, silver, gold, and cobalt) over its estimated mine life (2014-2027). The mine has a steady decline plunging to 1,774 feet below sea level.
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Copper mining in the Democratic ... Prehistoric mines in the Katanga belt have been found at Dikuluwe ... (33 ft) and 15 metres (49 ft) deep with galleries up to 20 ...