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Gold/Mining/Energy : MARUM RESOURCES ON ALBERTA -- Ignore unavailable to you. Want to Upgrade?

To: Jesse who wrote (1037)	11/18/1998 3:26:00 PM
From: Stew	Respond to of 2514

Whew!

To: Jesse who wrote (1037)	11/18/1998 4:33:00 PM
From: Leigh McBain	Respond to of 2514

Jesse as always, thanks for passing along Rick's response. The general philosophy part was not news, but I do believe is Rick's most eloquent explanation of it to date. Rick, thanks again for the time and effort involved in responding to us all. (thru Jesse). Salut, Leigh McBain

To: Jesse who wrote (1037)	11/19/1998 12:10:00 PM
From: eder	Read Replies (2) \| Respond to of 2514

Pardon me....if I may interrupt This means the disc at ground level will have to be, at minimum, 1,050 metres in diametre. Using geometry, it calculates that about 65 million cubic metres of overburden has to be mined, hauled, stored and dammed up (about 130 million tonnes) This size of pipe can be excavated(over burden) in 3 stages using stage 2 and 3 overburden to infill previous stage excavations.Less upfront costs and lower unit rates for disposal and restoration. The example pipe mine, under 100 metres of overburden, would cost, maybe $1,400,000,000. Compare this with the Ekati cost and assume a slightly higher mining rate and you get a rough, very rough, minimum grade threshold of about 1.64 times the Ekati grade to get the same rate of return at 100 metres of overburden. Excuse me....100 meter deep overburden would more likely encourage an underground model if grades merit costs.Not all diamond mines are open pit...;) Over burden is only one piece of the mine puzzle....not the only piece as Mr. Bouley intones.