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Ore – Wikipedia

The ores are extracted through mining. The cost of extraction must thus be weighed against the metal value contained in the rock to determine what ore can be processed and what ore is of too low a grade to be worth mining.
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Ore – New World Encyclopedia

Iron magnesium chromium oxide ((Fe,Mg)Cr 2 O 4 ), for production of chromium. At times, however, the cultural, social, or strategic goals of various peoples may render a deposit valuable for extraction in non-economic terms.
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Kalmiopsis Wilderness – Oregon Encyclopedia – Oregon History and Culture

The ultramafic soils in the eastern half of the Kalmiopsis region contain heavy metals such as chromium, magnesium, and nickel and are toxic to many plant species. These valuable ores were mined extensively during the middle decades of the twentieth century, prior to the designation of the area as wilderness.
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Beryllium – Wikipedia, the free encyclopedia

The green color in gem-quality forms of beryl comes from varying amounts of chromium (about 2% for emerald). The two main ores of beryllium, beryl and bertrandite, are found in Argentina, Brazil, India, Madagascar, Russia and the United States. Total world reserves of beryllium ore are greater than 400,000 tonnes.
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Alphabetical Browse – Britannica Online Encyclopedia

As the selling price of the mineral rises or the extraction costs fall, the proportion of the mineral inventory classified as ore.
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– BIOFOULING IN WATER WELLS for Water Encyclopedia Ground Water ThePoet

Special of heavy metals in Finnish lake ores. Nickel and chromium in ground water samples as influenced by well construction and sampling methods. From conventional to biological iron removal in France JAWWA 84: 158–167. Adsorption to heterogeneous surfaces. Metals in Groundwater.
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OSHA – Preventing Skin Problems from Working with Portland Cement

Slag is a by-product of the iron ore extraction process and has been used in concrete projects in the United States for over a century. Portland cement also contains trace amounts of hexavalent chromium, a toxin harmful to the skin. "Toxicological profile for chromium".
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Internet FAQ Archives – Encyclopedia of Espionage, Intelligence, and Security – Natural Resources and National Security – Agricultural land and water

Mineral resources include the ores of base metals such as copper, iron, and lead as well as strategic and critical metals such as chromium, titanium, platinum, cobalt, manganese, indium, palladium, and others.
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Concentration of the Ore – Learn everything there is to know about Metallurgy at – Metallurgy

This article discusses the extraction of metals in general terms, but methods for the treatment of ores are quite diverse. De re metallica describes the highly developed and complex processes of mining metal ores, metal extraction and metallurgy of the time.
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Global Nonfuel Mineral Resources and Sustainability

Comparison of the production trends of metallic ores, industrial minerals, and aggregates in industrialized countries (Wellmer and Lorenz, 1999.
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