The Process Mineralogy of Fenghuangshan Manganese-bearing Silver Oxide Ores, Guangxi

It was found that the manganese minerals in the ores are mostly cryptomelane, and a little pyrolusite and plumbopsilomelane. Silver facieses of the ores could be classified into three forms: ① micrograined cerargyrite, native silver and argentite, ② isomorphic mixture in cryptomelane, ③ micro mineral inclusions distributed in the microcracks of manganese oxide minerals and limonite. The distributing proportion of these three forms relates to the content of cryptomelane in the ores. Pyrolusite and plumbopsilomelane contain little silver.