GEOL107 Lecture Notes - Lecture 18: Metamorphic Rock, Siltstone, Drywall
5 Dec 2017
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Document Summary
Rocks and minerals extracted from earth that are of use to humans. Native metals - occur in rock in form of metal atoms - e. g. , gold, copper, silver. Mineral resources economically removed from rock. smelting) to extract valuable element, or elements, from ore. Most significant impact of mining is effect on water quality and availablity of waste resources. Leaching of toxic constituents, such as arsenic and selenium, can occur and flow with surface water and/or groundwater. Acid runoff and contaminant leaching is most important source of water quality impacts related to metallic ore mining. Most metals are ions that are bonded to nonmetallic elements need to separate. Smelting heating (high temperatures) of rocks - decompose to metal and metals from non-metals nonmetallic residue (slag) can thus extract metals. Smelting process- produdees metalic iron from iron-oxide minerals (like hematite) Fe2o3 (hematite) + 3co (carbon monoxide) . Steel is an alloy (compound containing two or more metals) of iron and carbon -
