Donner Minerals (DML.V) Message Board

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Gold/Mining/Energy : Donner Minerals (DML.V)

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To: Sam who wrote (2524)	12/29/1997 12:23:00 PM
From: Walt	Read Replies (2) of 11676

Visible Gold _ as Ed said gold is very soft so the field test to distinguish gold from other fools gold (usually tarnished pyrite or chalcopyrite) is to take a pin or small knife. If you can stick the pin in or scratch it, its probably gold. Depending what impurities are in the gold it can range in colour from pale yellow (butter colour) to bright yellow to a reddish yellow. The white veins you talk of will either be quartz or calcite. Most geologists carry a little bottle of diluted hydrocloric acid to field test between the two. Quartz is silica based so nothing happens but calcite fisses and disolves. Alot of your sulphides (on a fresh surface) look metalic. Most geos carry a magnet to test for pyrrhotite which is magnetic in most cases. The brassy yellow metalic stuff you are seeing is probably chalcopyrite.possibly mixed with a nickle sulphide. Hope this helps regards Walt

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