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Grasberg, West Papua at >3 billion tonnes at 1 ppm Au, is one of the world's largest and richest porphyry deposits of any type; Tujuh Bukit, Java, still under exploration, but likely to be bigger than Batu Hijau [19] Sungai Mak and Cabang Kiri, Gorontalo, at 292 million tonnes at 0.50 ppm gold and 0.47% copper [20]
Copper is a fairly common element, with an estimated concentration of 50–70 ppm (0.005–0.007 percent) in Earth's crust (1 kg of copper per 15–20 tons of crustal rock). [74] A concentration of 60 ppm would multiply out to 1.66 quadrillion tonnes over the 2.77 × 10 22 kg mass of the crust, [ 75 ] or over 90 million years' worth at the 2013 ...
This translates to about 3.9 tonnes/MW, or, in other terms, 1.2 tonnes/GWh/year. A plant of the same size without storage can have 20% less copper in the solar field and 10% less in the electronic equipment. A 100 MW plant will have 30% less relative copper content per MW in the solar field and 10% less in electronic equipment.
The Lead and Copper Rule ( LCR) is a United States federal regulation that limits the concentration of lead and copper allowed in public drinking water at the consumer's tap, as well as limiting the permissible amount of pipe corrosion occurring due to the water itself. [1] The U.S. Environmental Protection Agency (EPA) first issued the rule in ...
The maximum possible current density of copper in open air is approximately 3.1 × 10 6 A/m 2, above which it begins to heat excessively. [15] Copper is one of a few metallic elements with a natural color other than gray or silver. [16] Pure copper is orange-red and acquires a reddish tarnish when exposed to air.
Copper Basin (Tennessee) / 35.02; -84.36. The Copper Basin, also known as the Ducktown Basin, is a geological region located primarily in Polk County, Tennessee, that contains deposits of copper ore and covers approximately 60,000 acres (24,000 hectares). Located in the southeastern corner of Tennessee, small portions of the basin extend into ...
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