NASC 130 Essentials3_ch12

Minerals rarely resemble the pure metal ex copper

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Unformatted text preview: e metal blends Alloys Bronze – copper and tin Brass – copper and zinc Brass Essentials of Geology, 3rd edition, by Stephen Marshak Chapter 12: Riches in Rock: Energy & Mineral Resources What is an Ore? Rock with a concentration of metal-rich minerals Rock Present in enough abundance to be economic to mine Metal must be readily extracted from the mineral There are many different ore minerals There Ores form via geological processes Magmatic activity Hydrothermal alteration Secondary enrichment Sedimentary processes Weathering processes Hydraulic sorting Lead ore with galena that grew in dolostone, Missouri Essentials of Geology, 3rd edition, by Stephen Marshak Chapter 12: Riches in Rock: Energy & Mineral Resources Ore Formation Geologic processes generate mineral resources Geologic A dominant control is exerted by plate tectonics Tectonic effects are overprinted by the hydrologic cycle Ore formation requires large amounts of time Essentials of Geology, 3rd edition, by Stephen Marshak Chapter 12: Riches in Rock: Energy & Mineral Resources Ore Formation Mineral resource occurrence predictable Ores not equitably distributed Some countries have many mineral resources Other countries lack resources Other Essentials of Geology, 3rd edition, by Stephen Marshak Chapter 12: Riches in Rock: Energy & Mineral Resources Ore Formation Magmatic deposits Sulfide minerals crystallize early and sink in magma Form massive sulfide ores at the bottom of chamber Sulfides includ...
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