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Politics : Gold and Silver Stocks and Related Commentary -- Ignore unavailable to you. Want to Upgrade?

To: seventh_son who wrote (17899)	8/31/2005 10:34:48 PM
From: E. Charters	Respond to of 18308

The average for the South African mines was 100 tonnes of rock for every wedding ring sized diamond. The average bulk sample in a South African mine in order to determine whether or not to mine a particular level, was 10,000 tons. This practice has been discontinued in favour of committed mining. The groups that developed the best geochemistry tests (pyrope chrome chemistry and nickel chemistry of regular garnet) and geobarythermometry tests for fugacity and grade of a kimberlite where the Australians and Russians from the 1950's. The first people to routinely use geophysics and particularly magnetism to find kimberlite bodies were Canadian exploration companies, in Tanzania, South Africa, and Botswana. These techniques date from after the 1970's and perhaps earlier. One of the companies was Falconbridge. Train following of pyrope garnets back to source kimberlites in Canada was started in the 1940's. A kimberlite dyke in Kirland Lake was found by this method in 1948. Its train had been followed for 20 miles. 40% of kimberlites come to the surface in the NWT of Canada. Some of these kimberlites were found by the GSC by surface sampling in 1954. They were not identified as such at the time. All Canadian diamond mines were found in well known mafic alkalic volcanic centres of the kimberitic type, decades before the pipes were drilled. De Beers, through about ten companies, some working for them under contract and some owned by them, drilled 1500 holes in Northern Ontario and Quebec at kimberlitic targets between 1963 and 1989. It was rumoured through a company they owned that they may have found in Canada, three of what would be to DeBeers economic bodies if they were found in SA. One such body is known as the Victor Pipe (on the Attawapiskat River). (Found 1987) It is not known where the other two may be. EC<:-}