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Gold/Mining/Energy : Nuinsco Resources (NWI)
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To: Daniel Boucher who wrote (1165)3/4/1999 11:12:00 AM
From: E. Charters  Read Replies (1) of 5821
 
The reason you try to determine how the deposit was laid down is to be able to find others. (Joubin, Eldorado, 1955) If you know that the deposit type is contact sedimentary, then you follow the contact. With nickel in Sudbury they were lucky. The knew the basin rim sublayer contact was the locus so they followed the Norite marker. In Voisey Bay and the Basin however they have worked with deficient theory not allowing to find any more that may be there. Instead they chase pragmatic teasers that waste their energies. If they knew the orebodies were vent related and stayed close to the nickel source material and treated the volcanic gabbroic material as vent markers and fault tracers then their search would be much shorter. The key is the heat sources. In this they should be looking for alteration and felsic markers and volcanic seabed vent activities. Within a few 1000 feet of every nickel deposit around the edge of the anticline there should be rhyolitic pyroclastic or quartz porphry bodies. They could be diorites, porphyritic rhyolites or QF Porphry. Near them in the mafic cycle rocks near the sedimentary basement will be the nickel deposits. There will be a major fault control. This is true of every nickel deposit in Canada. All are near major felsic events. Sudbury was the scene of the most widespread felsic pyroclastic volcanism of any terrane in the world. The mafic events always precede the ore. the felsic volcanism is syngenetic. The mafics are subaqueous coarse volcanics. They are placid flows and provide a quiet environment to deposition. The felsics drive the water solutions with their slower cooling and trigger the vent deposition.

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