COLORADO MAY SEE `SMALL' DIAMOND MINE After many years of virtually fruitless exploration, northern Colorado may yet see a viable diamond mine. A cluster of kimberlite deposits near Kelsey Lake near the border with Wyoming could become a working diamond mine by the end of the decade, says Howard Coopersmith, president of Diamond Co. NL of Ft. Collins, Colo. Redaurum Ltd. of Toronto, Canada, bought a controlling interest in Diamond Co. last year and has approved construction of a processing plant to handle 250,000 tons of kimberlite yearly in the preproduction phase of the mine. The plant could be expanded to a million tons yearly if the mine goes into full production (that's about a fifth of the capacity of De Beers' large mines and about half its smallest mine). The Kelsey Lake cluster consists of two larger kimberlite pipes and four smaller ones – all of them diamondiferous,

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