RE:RE:RE:MD&Acbishop...good point! I am not sure so I went and looked this up at 911metallurgist.com:
Disseminated gold deposits occur in silicified igneous rocks with microcrystalline quartz dominating the ores. Gold occurs with anomalous arsenic, antimony, and mercury values near the surface. Silver is found zoned away from the gold, and base metals occur at depth, usually accompanied by gold and silver. Gold occurs disseminated in zones of pervasive silicification , and the gold deposits formed can be large tonnage, bulk-mining type targets
not sure I am any further ahead here....but it is my daily geology lesson.....