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Strategies & Market Trends : Winter in the Great White North

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To: Dave R. Webb who wrote (5077)	9/16/2003 10:08:51 PM
From: E. Charters	Read Replies (1) of 8273

I still think yo is poh. 1.5 million won't start a mine. You need 15 million for that. You have only got two years cash. I could start that mine with only a coupla bucks. I don't think it will start any other way. What you do is rehab the old shaft and access from there. get a used 300 tpd flotation mill and ship and assemble there. This is doable. I knew the Discovery mill ran in 1980 but I don't know of its whereabouts now. Mills are available. For god's sake don't let some A-hole engineers talk you into CIP if you don't need it. Slimes are only a problem of they are. Dewatering isn't that much of a headache as you have to do it to pump tails anway. Recovery with CIP run to max 80% from my experience. Reason is probably that solution levels are too low, they push the tons, and the carbon is often blinded. You can do almost 90 with float-treat, and maybe 93% with straight Merrill Crowe on a good day. (Whatever you do, don't believe the sticker figures for mills that you read about. Otherwise there would not be a tailings pond in Canada that ran less more than .007. Since there is not one that runs less than .025 by actual test, we can assume that 90% is the max recovery in gold mills historically. In fact if you use a figure of 85% and test to that, you won't often be disappointed.) Foat-treat mills are cheaper. If you read of the history of most ops from 1930 that is how they did it. Start at x capacity, make a con and treat that. Expand later. You need a mining engineering team for that. In house-contract is the way to mine. Pure contract is too expensive and too hard to control geologically. No cost responsibility. I doubt that you can mine less than .30 to .40 ore in that area with your situation. You had better forget going bulk mining. You can't do the capex. It might work if you could mill 1000 tons per day, but gearing up for that is trop cher. You also have to know how to keep underground methods working with that rate cheaply. It can be done with alimaks and certain mining methods. With D ore I am not sure on that, although vertical variability may be low, the lateral may be too sinuous. Widths need to be about 6 to 8 feet. The only other way to reduce costs to the bone is by mini remote machine methods. This requires off the shelf but advanced remote construction. Eminently doable but not yet implemented except with large scale machines. Your only option is now is to have a mining plan. Further expansion of the ore is not necessary. You might get question marks on your ore development if you have not "keyed" that to practical stoping experience. This is jaded question that I could see being raised. Can you mine what you say you have in a resource at that grade? Is your structural outline correct for the known disperions of the values along the fabric of the veining? A good number of mines have gone wrong there. The structural geology of the Discovery is outlined in the Structural Geology of Canadian Ore Deposits. CIM 1957 EC<:-}

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