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To: Alan Whirlwind who wrote (68372)4/27/2001 10:21:57 PM
From: goldsheet  Read Replies (2) | Respond to of 116759
 
> some of the better veins were worked

I believe it is more likely an underground vein mine gets highgraded than an open pit heap leach. I'm sure you may go after a oxide or sulphide depending on what the heap leach pads and roaster can handle, or go after better zones for a brief period of time, but the tonnage is so high that you can not do it for extended periods - it must average out.