Show THE LANE SLOW SPEED MILL an up to date chilian combining new ideas with approved old ones 11 the lane slow speed chilian mill company 1 py of los angeles is more than pleased with the way orders have been coming iu IL of late flate for its slow speed chilian mill among recent orders for reduction plants of this character being those coming from the emma L al M company of wadsworth lN nevada evada venable bonding leasing company boise idaho carr bros new york for export to montevideo durango mining company los alamos sonora mexico golden surprise mining company butte montana and dr louis weiss of rawhide the rawhide mill will be installed within sixty days under the general management of B C sweet E M the lane mil is rapidly gaining in favor with mine owners and is attracting the attention of eminent authority on milling matters in his standard work entitled hints on amalgamation W J adams A M le iz M after an introduction treating on mills and milling has the following to say regarding the lane mill permission having been obtained obtain dd for its reproduction pan grinders take too much power and have no screen surface to keep the uncrushed sands under the muller shoes till thoroughly comminuted com of the chilean mills we have had in constant use for many years several types of which the most widely known were the huntington and bryan but in the last three years a new device has come before the public which has proved itself of marked merit I 1 refer to the lane slow speed mill an annular ring in which heavy rollers move at a minimum of speed but which will crush all the ore so that over 90 per cent passed through a mesh screen and at such a rate that a 10 foot mill will replace 20 stamps it is a perfect amalgamator and also acts as a hydraulic sizer so that subsequent concentration is carried to the hl highest chest efficiency frequently the extra process of cyaniding cyan iding can be entirely eliminated this system has also the advantages of cheapness of initial cost of installation smaller expense of power and attendance over stamp mills and an appreciable reduction in the water supply required 1 I speak so strongly because of the results of three authentic tests in competition with stamp mills in all of which the costs were decreased the amount crushed largely increased and amalgamation and concentration improved to such an extent that the stamp battery practice was completely outclassed the reasons are obvious the pulp is ground so fine that all particles of free gold are separated from both the barren gangue and the base material such as pyrite and the gold itself is polished and all the oxidized coating removed no matter how rusty it may be the pulp is thoroughly mixed with the quicksilver as in a standard pan and yet does not have to be so thickened owing to the narrowness of the annular ring the high discharge twelve inches insures fine sliming though the outlet is through a screen having only ten holes to the inch and this large size of the discharge openings gives a minimum output even if the gold is microscopically fine it is freed from its matrix cleaned by the grinding action and more readily absorbed by the quicksilver it remains in the pan sinking from its great specific gravity the slow movement of the rollers and the height of the discharge in fact this mill is as near an approach to an ideal amalgamator as has yet been invented when the pulp leaves the mill being nearly uniform in size of grain and gravity it is not hampered by coarse particles display ing the buoyancy of fine metallic scales of air dried sulphides sulp hides the relative differences in the specific gravities of the gangue and metallic minerals become effective so that the concentrators can produce clean concentrate as well as low tailing with maximum efficiency even if the tailing still carries sufficient value to justify further treatment it is in the best condition for subsequent cyaniding cyan iding while as conditions dictate the method the concentrate can be either shipped to smelter or cyanided on the spot at the lowest cost being clean less is paid for freight and working costs when shipped and if worked on the spot there are also iso diminished expenses not only from the smaller quantity to be treated but the in increase crease in actual value |