Salt Lake Herald | 1907-07-14 | Page 27 | Tests Made on Promontory Ore

TESTS MADE ON PROMONTORY ORE Ogden Metallurgical Engineer Shows How to Handle Low Grade Coppers LEACHING METHOD WORKS AND HIGH EXTRACTION OF VAL VALUES VALUES UES IS MADE Professor J H Weber the metallurgical en engineer of Ogden who has been making II a study of the copper deposits at Promontory tory on the north norih end of at the l lake ke has gone still farther and made a number ot of leaching tests at his laboratory and test in works Washington avenue Ogden on the tho ores from the Lakeside Copper corn com In a report made a 0 day or two ago 80 ho he explains what character ot of ores are susceptible to profitable treat neut ent by the tho acid process and to show that the de owned by the Lakeside company allowing or 01 admitting that the average c copper per contents will not exceed more than 1 av per cent lie Ho explains ot of course that thatto thatto to make money on such ench low grade mater material ial there ther must be large quantities ot of the theore ore oro that can bo be easily mined and treated on the ground He finds conditions nIl all allright right at the Lakeside property and sums p the results s of his WI as to fol follows lows I This mine has II a very large bOdy Ot of low Jow grade grado ore or In 0 a blanket deposit and can bo be mined d and milled for tor less than 1 per ton The Tho salt water which t Will be necessary to use Is a help Instead of a The mine is only one and one half baIt miles tram from railroad and a 0 switch can bs be put In cheaply and the tho ore need not be routed The low grade ore carries cames about 94 91 per cent silica and about per cent copper By using a S 3 per cent solution of acid and the ore oro crushed to toa toL a L twenty mesh II a saving ot of from 89 to 97 per ver cent can b be made Sixty SIty pounds ot of at a cost ot of about 1 cent per pound Is suffIcient to treat a ton of ore re It will wUl take pounds of scrap iron at a cost coet of about 20 per ton to precipitate pounds of copper then the copper will assay from 95 9 to 98 per cent and can be put Into copper In Ints gets ts ready for market This copper is woith orth at least 00 I cents per pound It a 90 per cent saving Is 18 made and the ore only goes per cent copper then there will be pounds of copper worth m 20 cents per pound netting UiO The sixty pounds oi of Is not nfl an used up In the precipitation of tIle the copper but can be and used again so that not over ot of It Is used One can readily see that mining milling and leaching the ore are will cost oost less than 2 per ton and if only a DO 00 per cent saVing is made there will be II a largo large profit made on the low grade ore