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Gold/Mining/Energy : Winspear Resources

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To: Charles Kalb who wrote (17061)	3/28/1999 6:10:00 PM
From: Walt	Read Replies (1) of 26850

Casing is run down from the drill through the ice down to the lake bottom through the sediments and into the rock initially, then the drill rod runs through this to drill the hole into the rock. In exploration cementing is only done when you think you have hit something good because it is expensive and time consuming. So the early holes probably weren't cemented but they didn't go down through the dyke either. Also in exploration often the first set of holes arent cemented because you are testing the near surface and if you find something good you are going to have to leave cao rock there anyway so if things look real good and you start drilling into what may be mineable ore then you start cementing. There have been lots of cases though that when a mine developes someone has had to go back and cement holes. Not a recommended proceedure to be sure. It may cost more to cement holes at the time but go back and try to re collar and cement gets real expensive. regards Walt

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