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mineral ors can be divided into lean ore common ore and rich ore

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Jan 28 2020 · Feb Ore value and profitability of mining according to relative value of assay, the deposits can be classified into: Rich ore II. Medium ore. III. Lean ore Only extracted by cheapest techniques like hand methods. Prof. Dr. H.Z. Harraz Presentation Mining Geology, IntroductionFebruary 2016 27.
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