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Artisanal and Small-Scale Gold Mining Without Mercury. ... recognizes the risks of using mercury in artisanal and small-scale gold mining, ... When these materials harden the gold can be easily separated from the slag. The slag frequently contains addition gold that can be recovered through reprocessing.

Management of copper pyrometallurgical slags: …

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Tailings - Wikipedia

Tailings, also called mine dumps, culm dumps, slimes, tails, refuse, leach residue or slickens, terra-cone (terrikon), are the materials left over after the process of separating the valuable fraction from the uneconomic fraction of an ore.Tailings are distinct from overburden, which is the waste rock or other material that overlies an ore or mineral body and is displaced during mining …

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Waste rock and tailings may still contain a low concentration of the target material such as copper or gold and may be reprocessed if the price of the metal rises to a point where it becomes economic to do so. Slag Recycling. ... More Recycling, Less Mining …

Gold & Silver - Department of Energy

Energy and Environmental Profile of the U.S. Department of Energy 7.1 Process Overview 7.1.1 Surface Mining Surface mining is the primary source of gold and silver.

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Slag - Wikipedia

Slag is the glass-like by-product left over after a desired metal has been separated (i.e., smelted) from its raw ore. Slag is usually a mixture of metal oxides and silicon dioxide. However, slags can contain metal sulfides and elemental metals.

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Tailings - Wikipedia

Considerable effort and research continues to be made into discovering and refining better methods of tailings disposal. Research at the Porgera Gold Mine is focusing on developing a method of combining tailings products with coarse waste rock and waste muds to create a product that can be stored on the surface in generic-looking waste …

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