Show IT used to be that in the search for paying pay ing mines the prospector confined his ht attention largely to the discovery of small veins band and ledges of very rich ore we say small veins because dame nature rarely deposits her precious metals in any form excepting between narrow walls and in years gone by mining was in such a primitive stage that none but high grade ores could be mined and worked at a profit now however as fashions ever ch change anre r it is the endeavor of mining 11 men to secure propositions where the ore bodies are large where they are mammoth in their proportions rather than mines carrying narrow chutes and pockets of exceedingly rich mineral the reason for this change of method being that the advancement in the manufacture of mining and milling 11 machinery enables the producer to extract and treat low grade ores at a profit the most pronounced improvement inn in jn illing machinery being in the concentrator by the utilization of which ores of low grade can be handled and marketed which years ago were comparatively worthless by the use of the concentrator the precious metals are separated from the waste material and three or four tons of ore can be transformed into one of concentrates which enables the mine owner to make a radical saving in freight charges while the product brings more at the smelters shelters sm elters as it is more desirable in form inasmuch as it can be reduced to bullion at a less cost than if the crude ore with its accompanying waste were dumped into the furnaces with improved concentration methods a much wider field is opened to the riner miner and he is the gainer by this innovation |