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Field Testing For Gold And Silver - A Practical Manual For Prospectors And Miners Author: INTRODUCTORY TO TESTING GOLD ORE IN THE FIELD. Occurrence of Gold Ores.-- Free gold, which can be extracted by mercury 2. Gold in association with other minerals. In field tests, gold ores can therefore be tested by amalgamation or by smelting, as hereinafter explained. Free - Milling and Refractory Gold Ores. - The first class includes IS place... more »
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