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* ' . comparatively small coal and OSHAWA TIMES, 17 Weaney, bene 30, 1968 -- --cP Photo Thar's Gold In Them Thar Hills! By DON MacLACHLAN EDMONTON (CP) -- With a space-age version of the pros- pector's span and sluice box, miners mow can recover gold that once defeated extraction methods. The means is the Compound Water Cyclone, originally devel- oped in Alberta by Dr. Jan Vis- man of 'the federal mines de partment for removing shale and other impurities from coal. The machine uses the same principle as the prospector's pan, washing away crushed| rock angi sand by swirling water over them and leaving behind the heavier gold. But, siays Dr. Visman, the cy- clone cian handle finer water- solid mixtures than the apn or sluice box and thus gives higher recovery rates where fine gold particles are heavily imbedded in rock. » INCREASE YIELD Its -first application to gold mining, at a three-man mine near Yellowknife, N.W.T., re- sulted in 'considerably higher" recovery over a two-year per- fod than conventional methods. Dr. Visman adds: "A lot of gold is; left in the tailing dumps that ig: of small size and used to be washed up and out with) the vyater and lost in the sluice| box fnethod. It could be re- claimed by a cyclone." The cyclone has been com- mercially develéped and mar- keted) by Cyclone Engineering Sales Lid. of Edmonton, under licence from the federal govern- ment. Cywlones now are in use in ce t sand cleaning opera- tions in Alberta, British Colum- bia and Newfoundland. A larger coall cleaning plant opened in May in eastern Australia. PREDICT LARGE UNITS Peter D. J. Vinkenborg, gen- eral; manager of Cyclone En- gindering, says the next steps are development of the cyclone for large-scale use and its ap- plication to other fields such as irom minin g. The cyclone looks like an in- veigted heavy steel bottle with an open neck. Gold'sand, mixed with water, enters near the base and sinks to the "'shoulders" of the bottle, forming a bed. Water swirls over the bed, picking up the sand and rock ardl washing it away through a tube piercing the base of the bottle. The heavier gold slowly edges down and out through » neck of the bottle, | dn coal cleaning, as at the Peabody-Thiess-Mitsui mine at Moura, Australia, the situation is reversed. The coal is washed agvay and the heavier rock sinks. The largest cyclone can WMandle about 60 tons of solid material an hour, stands six feet tall and has a 24-inch dia- meter. The Moura plant uses tlaree. The smallest cyclone is of| two - inch diameter and can} handle slime. Usually, 24 are) 'combined into one unit. The} 'company is considering produc- 'ing even smaller ones to re- - cover precious metals. The fully-automated Yellow- knife plant uses two connected! cyclones. This can handle about! 68 tons of gold sand an hour, mixed with between five and 10) times as much water. | GARBAGE IRKS | A BALD DOME LONDON (Reuters) -- For- mer garbage collector Sid- ney Thompson has taken his case to the high court of England -- arising from the fact that he is short and bald. Because he is short, said Thompson, refuse: spilled on his head when emptying gar- bage cans into a garbage truck. And because his bald head was unprotected, he added, he later developed a rash. He said it-was caused by der- matitis which had since kept Jim jobless for four years. Thompson is suing a local council for negligence--which the council denies--in not pro- viding him with .protective clothing. The case, first of its kind in legal history here, continues Friday. 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