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Gold/Mining/Energy : Canadian Diamond Play Cafi
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To: m.philli who wrote (395)12/16/2002 1:05:10 PM
From: E. Charters  Read Replies (2) of 16213
 
Gold in Ontario/Quebec/Manitoba is usually at the temiskaming sed/volcanic contact. It could be related to iron seds (banded IF). Rarely is it smack dab in the middle of conglomerate, arenite (quartzite) or wacke. In KL and Timmins the gold is in syenite contacting conglomerate, for KL and in Timmins, seds contacting conglomerate and greenstone. You do get ore in the conglomerate, but it is nearby volcs. Ore in most seds usually are volcanic seds, as in tuffs. Nearby/contact porphyries are common.

These sediment formations however are pure cold sediments unrelated to volcanism and having little chemical component save the basal limestone. We are in a quandary therefore to identify the heat engine that drove these ore fluids. The age of sediments, proterozoic, does not correspond to any of the Archean ore bodies elsewhere in Ontario. However they may bear a relation to the possible IF/Kuroko gold orebodies of the Geraldton camp. This is because Geraldton had emplacement due to deformation which displaced the Hearst diabase swarm, which is also proterozoic. The Snake river seds are probably Ghanian age or SA age reef conlgomerates. They have related late age unconsolidated placers in the Vermillion drainage where the qtz pebble detritus formed. Could these vein deposits be related to remobilization of fossil placers? Or are they related to some apophystic subcropping diapir or the Sudbury event, with distal vents? There is copious felsic magamatism south of Sudbury and many fenitized granites.

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