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Gold/Mining/Energy : Nuinsco Resources (NWI) -- Ignore unavailable to you. Want to Upgrade?

To: BLZBub who wrote (193)	1/23/1999 6:13:00 AM
From: E. Charters	Respond to of 5821

D. Hume showed me the core and the nature of the deposition of the gold. It was definitely in tension fractures in largeish nuggets. There could be said for simplicity's sake to be two types of dilation in rock strata. Shear and fracture. In a fold the shear will be at an angle frequently near the bedding plane direction. But the tension fractures will cross the bedding plane at a much higher angle. These fractures are in what are called conjugate sets frequently with a bisecting angle of 60 degrees. One set of fractures is usually the more well developed and is more often ore related. Now geologic strike directions are usually developed along the strata direction and/or the shear direction that approximates it. But fractures may cross this at a significant angle. Whole orebodies can be found within giant tension fractures. Here the ore was within micro analogues of these larger fractures. One could see that statistically to drill at right angles to the shear the probability of hitting a nugget in the fracture was low. But if one drilled obliquely to the shear one would hit many more of the fractures as the drill string snaked along the fracture direction. So the reason for the increase in the grade of the depsoit could be graphically seen in the core. Think of it this way. The pattern of a bunch of marbles layed out across a stack of two by fours on their edge is clearly diagonal to the direction of the boards. But the diagonal lines are separated widely. So you can drill to hit only one marble at a time in the multiple rows or you can drill to hit as many as you can but only once in a while will you hit any at all. Or you can drill across the boards to hit more often because the lesser the angle of separation between the drill and the alignment of the marbles the more there is a chance of hitting the marbles. That is what they in effect did at Rainy River and that is what the grade increased. This is vastly different than drilling down dip as the anlogue of the "veins" here are discontinous and very small and the idea is to establish their continuity, ergo their quantity. EC<:-}