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Gold/Mining/Energy : ASHTON MINING OF CANADA (ACA) -- Ignore unavailable to you. Want to Upgrade?

To: maintenance who wrote (3099)	12/4/1997 3:18:00 PM
From: Jesse	Read Replies (1) \| Respond to of 7966

A little info for perusal, regarding Aber's "Four Most Prospective Diavik Pipes" including graphics, facts and figures: aber.ca - - - - - -- - - A small essay from the same site: "How Grade and Value are Determined" aber.ca "Resource definition begins after exploration drilling discovers and delineates a promising pipe. The first step, mini-bulk sampling, involves extracting large diameter core (LDC) samples. Ideally, between 50 tonnes and 80 tonnes of kimberlite is collected and air freighted to a laboratory for analysis of diamond grade. All four of the most promising Diavik pipes have undergone at least initial mini-bulk sampling by LDC drilling. Prior to or concurrent with mini-bulk sampling, each pipe was delineated to a depth of 400 metres to help define the volume of reserves and assess the geologic variability. After mini-bulk sampling, a large bulk sample is extracted to provide an estimate of the value of diamonds in the pipe. This value is combined with the grade information in the mini-bulk sample to provide an estimated average value per tonne of kimberlite in the pipe. Since 1995 Diavik has excavated a two-kilometre network of tunnels from an island in Lac de Gras to the two most promising pipes. One decline intersects pipe A-154 South at a depth of 155 metres below lake level. Another decline intersects pipe A-418 at a depth of 145 metres below lake level. About 12,800 carats of diamonds were obtaned from pipe A-154 South and more than 8,000 carats were obtained from pipe A-418. Diamantaires in Antwerp agree that the diamonds are attractive, of high quality and readily marketable." :>