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Gold/Mining/Energy : ECHARTERS

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To: Al Cern who wrote (2571)	4/25/1998 9:03:00 PM
From: E. Charters	Read Replies (1) of 3744

Perhaps the closer the cut-off to the average grade the more uniform the orebody or perhaps it could mean the less there is of lower grade ore. Or the higher the cost in relation to the average grade. This MIGHT mean the orebody is marginal OR that it has a sharp cutoff in gradation from ore to waste. Some vein type bodies have very little in the way of low grade mineralization in the "wall rock", thus there is very little to add in. The only way cost figures can be estimated is in a very general way taking into account the costs in that region, the type of mining, a very general picture of the ore, its metallurgical difficulties and the available ore for mill feed on a tonnage basis per day and over time. It is generally the field of a feasibility study to determine this and it can go to the wire with competing methods of extraction and and milling being tried on paper and no one knowing until the bottom line is produced and read which is best or if it is feasible at all. It ain't easy to judge in all cases. Metallurgy, infrastructure and development costs turn out to be all important and can surprise the uninitiated. echarter@vianet.on.ca The Canadian Mining Newsletter EC<:-}

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