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2019 6 10 Increasing iron ore demand, coupled with the depletion of high grade hematite ores in the United States, after World War II led to development of lower grade iron ore sources, principally the utilization of magnetite and taconite. Iron ore mining methods vary by the type of ore being mined.
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2017 12 22 This publication discusses common business expenses and explains what is and is not deductible. The general rules for deducting business expenses are discussed in the opening chapter. The chapters that follow cover specific expenses and list other
2019 6 13 Copper processing Copper processing, Mineral processing. In the ore dressing plant, In the electrolytic process, copper anodes and starting sheets are immersed in an electrolytic solution made up of copper sulfate and sulfuric acid. An electric current is passed through the solution, and copper from the positively charged anode is
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2006 11 20 Stainless steel is an iron containing alloya substance made up of two or more chemical elementsused in a wide range of applications. It has excellent resistance to stain or rust due to its chromium content, usually from 12 to 20 percent of the alloy. There are more than 57 stainless steels