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The copper production from this mine (the investment was reported to be of the order of US$5 billion) has been projected at 450,000 tonnes of copper for the next 50 years; [10] the mining reserves are reported to extend up to 20 miles beneath the Gobi Desert and is also estimated to yield 330,000 ounces of gold annually. [5]
Pitaya usually refers to fruit of the genus Stenocereus, while pitahaya or dragon fruit refers to fruit of the genus Selenicereus (formerly Hylocereus), both in the family Cactaceae. [3] The common name in English – dragon fruit – derives from the leather-like skin and scaly spikes on the fruit exterior.
Copper mining activity increased in the early 2000s because of increased price: the price increased from an average of $0.76 per pound for the year 2002, to $3.02 per pound for 2007. [2] A number of byproducts are recovered from American copper mining.
Production trends in the top five copper-producing countries, 1950-2012. This is a list of countries by mined copper production. Copper ore can be exported to be smelted so that a nation's smelter production of copper can differ greatly from its mined production. See: List of countries by copper smelter production.
Dragonfruit stems are scandent (climbing habit), creeping, sprawling or clambering, and branch profusely. There can be four to seven of them, between 5 and 10 m (16 and 33 ft)or longer, with joints from 30 to 120 cm (12 to 47 in) or longer, and 10 to 12 cm (3.9 to 4.7 in) thick; with generally three ribs; margins are corneous (horn-like) with age, and undulate.
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]
At the same time, the price of copper dropped to $0.19 per pound, down from a high of $0.55 in 1864. Rather than invest in new equipment and explore for new ore bodies, the company stopped working the mine, and turned it over to tributers – independent miners who paid for the privilege of mining, usually paying a share of the ore they took ...
The DRC copper belt includes some of the highest-grade copper deposits in the world. In some reserves the grades are above 5%. The ore also has high grades of cobalt and may hold 34% of the world's cobalt reserves. There are large deposits that have yet to be explored using modern technology, so the size of the reserves may be understated.