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 placer gold and free-milling gold ores. Free gold Caries in its condition, and sometimes, fortunately rarely, it appears to exist in an allotropic condition, which will not amalgamate. Much interesting information about gold is found in a Handbook on Gold Milling, by Henry Louis, Assoc. R.S. M,, published by Macmillan Sr Co. That is, the short ton now very generally used in America and South Africa. For treatment on commercial scale see Appendix A p. 135. A 2 PIELQ TESTING FOR GOLD AND SILVER. The second class includes gold locked up in sulphides and tellurides of gold and silver, such as sylvanite and petzite. The cost of treatment of a gold ore...

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