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Gold/Mining/Energy : Pacific Rim Mining V.PFG
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To: David R. Schaller who wrote (8961)3/4/1998 11:53:00 AM
From: Bill Jackson  Read Replies (1) of 14627
 
David, You do not save drowning men by throwing them a few feet or core.
The general rule is one yard of 2.5" core weighs 17 pounds or 7.8 Kgms so 1000KGMs would need about (133 yards)400 feet of 2.5" core. You can proportion this for thinner/fatter core with the Pi x R x R x L = cubic inches.
Divide by 1728 to get cubic feet, and remember that a cubic foot of water weighs 62.4 pounds and typical rock is 2.7 times a dense and thus weighs 168 pounds per cubic foot. so 1000 Kgms is 2200 pounds or about 13 cubic feet(a cube about 2.35 feet on a side) That is why it is so easy to rock someone to sleep.
Of course they will only pick portions of each hole depending on the cutoof they use, and they might well do several tests on assorted holes and areas.
You can get densities up to 6 or 370 pounds per cubic foot or more with sulfides or galena etc, so make sure yoiu get the density of the rock to use these ratios.

Bill
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