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The term refers to mineral deposits (typically metals) in the earth's crust that can be extracted for various uses, such as for use as pigment when ground, as well as for profit. Common types of ore include iron, copper, zinc, lead, and gold.
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"Copper Ore Murdochville, July 2, 2013" by Cephas is licensed under CC BY.
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References
Hustrulid, William Andrew
2014 Ore. Encyclopedia Britannica Online: http://www.britannica.com/Ebchecked/topic/431610/ore, accessed October 27, 2014.