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Gold/Mining/Energy : Canadian Diamond Play Cafi -- Ignore unavailable to you. Want to Upgrade?

To: m.philli who wrote (251)	10/28/2002 10:13:33 PM
From: rdww	Respond to of 16206

Well I never stuck around that long on SUF - smart guys with lots of irons. As for the ct sizes - there was a thing from Mining Insight that was on pele's website last year in which Steele referred to how large a 1/4 ct is - it's quite small. Looking at Birks diamond book has a pic of a polished .25 ct stone and it measures 5/16 of an inch across FWIW. How large was the stone that they started with is another story. The octehedral is the best shape since it loses the least in cutting and polishing. Clear colourless octehedrals are nice stones to have when humping a potential diamond mine.

To: m.philli who wrote (251)	10/28/2002 10:30:21 PM
From: russet	Read Replies (2) \| Respond to of 16206

Just for reference sake can you or someone tell me what the dimensions would be for a 0.25 caret diamond? First let's make an assumption,...that the diamond we are looking at is a perfect octahedron,...the best and most valuable kind. Some additional assumptions,...the density of diamond is 3.51 milligrams per cubic millimeter (mg/cu mm), and one carat weighs 200 mg. Now we have enough to estimate diamond dimensions if we accept the volume of a octahedron is about one third the area of a square that exactly takes in the width, length, and height dimensions of the octrahedron. So what would the approximate width, length, and height dimensions of a octrahedron diamond weighing one carat be?,.... [(0.25 carat x 200 mg/carat) /3.51 mg/cu mm]x3 octrahedron/cube area = x mm cubed for octrahedron or (42.735mm) cubed octrahedron = x mm cubed or x (for a octrahedron)mm = 3.5 mm width, length, and height So a 3.5mm x 3.5mm x 3.5 mm octrahedron would weigh approx .25 carat By contrast, if the diamond were a square in shape, a 0.25 carat diamond would have dimensions of 2.4 x 2.4 x 2.4 mm in width, length, and height. As far as the Victor pipe is concerned,...depending on who you talk to,...you get different numbers of grade and valuation of diamonds. I have heard some phases of the pipe are very high, in excess of 1 carat per tonne,...which may explain DeBeers interest in the pipe. Will P wrote the following in one of his recent efforts,... "The De Beers Victor project is quite some distance east of the Superior project, but it remains the best shot for an Ontario diamond mine, and it has increased interest in the area now being examined by Superior. Progress at Victor has been excruciatingly slow however. The pipe was discovered in the latter half of the 1980s, but it was not mini-bulk sampled until 1997. That test processed about 330 tonnes of kimberlite, and about 108 carats of diamonds were recovered, for an indicated grade of 0.33 carat per tonne. The grade was quite modest, but the diamond value apparently was toward the upper end of the scale, as the stones were reportedly worth $154 (U.S.) per carat. That was encouraging, as Victor could contain nearly 40 million tonnes of kimberlite. De Beers mulled that result over for a few years, then decided to proceed with a much larger test. In 2000, De Beers extracted about 10,000 tonnes of kimberlite from the large pipe, and it was processed last year. De Beers was typically tight-mouthed about the result, but rumours suggest that the bulk sample produced a grade somewhere between 0.25 carat per tonne and 0.45 carat per tonne. Both figures are probably accurate over at least a portion of the body, which is believed to contain different facies of kimberlite, with different diamond grades. Whatever the grade and value of Victor, De Beers thinks enough of the project that it continues to advance it toward a feasibility study, although the pace continues to be slow. Victor is just one of about 18 kimberlites that De Beers found on its Attawapiskat property, but Victor was the only one that displayed any real economic promise."