Earth Sciences 1022A/B Chapter Notes - Chapter 10: Ore, Kidd Mine, Miscibility
15 Nov 2018
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Document Summary
A mineral deposit that is economic and can be mined for profit. Different tectonic environments and processes forms different deposit types. Rocks contain elements but the abundance that they contain is too low to be considered a mineral or ore deposit. Crust (concentration of elements is increased by magma) Fractional crystallization and gravitation settings can help increase elements. Hydrothermal fluid carries minerals and precipitation of the minerals result in ore deposits. Ore deposits are igneous, sedimentary, and metamorphic/hydrothermal. Alteration: change in chemistry or minerals in the surrounding country host rock. Area of alternation: zone of alteration that surrounds a ore deposit. Gangue: uneconomic mineral or rock that commonly intergrow with ore minerals and imped extraction. Grade: concentration of ore in a rock (measured in ppm, ppb, or g/t) Waste: rocks that contain the mineral/ore deposit, usually has to be removed to get the ore. Form via igneous process such as fractional crystallization and sulphide immiscibility.
