Lecture 9 Feb 8 2008 Hydrothermal ore deposits

Lecture 9 Feb 8 2008 Hydrothermal ore deposits - Global...

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Unformatted text preview: Global production of copper metal is about 10 million tons per year. Consumption in the U.S. is a little more than 2 million tons of metal per year. Copper is the third-most consumed metal after iron and aluminum. We use copper in many ways. Most consumption is related to copper’s electrical conductivity. Building construction 39% Electricity industry and electronic products 28% Transportation equipment 11% Industrial machinery and equipment 11% Consumer and general products 11% Earth’s crust The average content of copper in continental crust is 0.0058 % (by weight). An ore is a concentrated occurrence of a desirable element, present at concentrations high enough to be exploitable economically. To be exploited economically, Cu ore must be concentrated about 80 times above average crustal concentration. Chalcopyrite is a mixed copper and iron sulfide (CuFeS 2 ) Chalcocite is copper sulfide (Cu 2 S) Malachite is hydrated copper carbonate (Cu 2 (CO 3 )(OH) 2 ) Hydrothermal fluids are much cooler than magma, typically around 300°C. The bulk of a hydrothermal vein deposit is quartz that has no...
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Lecture 9 Feb 8 2008 Hydrothermal ore deposits - Global...

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