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Gold/Mining/Energy : Winspear Resources -- Ignore unavailable to you. Want to Upgrade?

To: Gord Bolton who wrote (17043)	3/28/1999 11:11:00 AM
From: jack hampton	Read Replies (3) \| Respond to of 26850

Thanks gents for the replies. I'm just a Winspear virgin here trying to get up to speed. Based upon what I'm hearing it does appear that drift and fill is the way to go. I would expect this to be up to 2 times more expensive than room and pillar>> look for $C60-$C80/tonne. If the valuations are there this should not be a problem. For example>> thats the method Prime is using out in BC. As for mining soft ground, there may be some examples in Ontario at the gypsum mines and the talc mine near Kingston. For drift and fill, you would back haul the waste rock from the pit and use "Nevada rammer/jammers" to place it to make it tight to the back. Add a little cement slurry if you want. The issue is not the back coming down, it will deflect for sure, you just want to do it in a controlled fashion. Cemented rock fill is the cheapest solution for drift and fill here. As for placing concrete pillars underground, remember that the cement likely has to come from the Inland plant in Edmonton. I think when you do the math you will find you are placing back something worth 50% of what you are taking out. This is what changed the economics against Echo Bay when they no longer could ignore the ground movement and stress. Gord>> all equipment is diesel operated. Gasoline is not allowed underground. You must ventilate at 100 cubic feet per minute per horsepower underground. As for permafrost>> Polaris is the best example. The have to refrigerate(!!) the air in the summer to stop the ground from deteriorating due to the pore water present. This is not a problem with granite but may be with kimberlite if is has an appreciable water content. Don't have an answer here. Finally, I can't help but think that the way to approach this deposit, is not with the BHP's of the world who spend big bucks, but with the Claude Resources of this world, who can make economic what the majors can't. Got to go, I have a tee off time to make. And russett, take it easy, sounds like you have much at stake here. It's not a matter of whether there is something mineable or not, its a matter of how they finance it so that you, as a shareholder, don't lose your shirt through stock dilution.