| OCR Text |
Show CONCENTRATING WORKS. From the results already accomplished accom-plished by Wren's concentrating works is indicated by ass:iys of the reduced pulp, we feel justified in pronouncing Lbc experiment, a success. The pulp MQcentratcd from rock that will average aver-age about $20 per ton, assays over 3100 per ton, leaving, even with the present primitive and incomplete condition con-dition of the works, a handsome margin mar-gin over the cost of concentrating, besides be-sides the expense to be incurred in roasting and amalgamating. An inclined tablo and settler have recently been added to tho works, which further reduces tho pulp in bulk after it leaves tho revolving screen, from fifty to seventy-five per cent., the waste containing but the merest trace of silver. Tho table is a very simple contrivance, being nothing more or less than a wido box, resembling somewhat some-what in shape, the ordinary dump box, usually placed at the head of a set of sluices in river mining in California, Cali-fornia, and given about the same "fall." The pulp, after it leaves the screens, is spread over this tablo and a half dozen small streams of water from faucets in a reservoir arranged for the purpose at the head of the bjx, allowed to ilow over it, carrying off into in-to the settler the lighter portions, and leaving a large proportion of the mineral miner-al on the bed of the table, which is scraped up and with what is left in the settler alter a day's run, comprises the "pay grist," which is then ready for the roasting and amalgamating process. pro-cess. By this process ninety per cent, of the silver oontained iu six tons of rock is couccrtratcd in about one ton of pulp, the weight at tho lightest esiimato not being more than ten per cent. Tho cost of crushing is merely nominal and if tho screens, table and settler were of the samo capacity as tho crusher, Mr. Wren is confident that ho could easily rcduco twenty tons of ore in twelve hours with his present steam power and machinery, in which case it will be plainly seen that ten or twelve dollars rock can bo profitably worked which we havo no doubt will bo satisfactorily proven when everything is properlj-rogulatcd properlj-rogulatcd and each seperato branch of the work is rightly proportioned in regard re-gard to capacity. There is being attached to the works an elevator, for the purpose of carrying the rock which passes over tho screens back into the crusher, thereby accomplishing accom-plishing by machinery what has heretofore hereto-fore reci'iiied the labor of one man to perform. This is only one of tho many improvements proposed by the proprietor, propri-etor, and we arc confident, iu a short time, that we willl be enabled to chronicle chron-icle results that will convince the most skeptical that our estimates are not overdrawn, or our predictions based upon a chimerical foundation. Heat River HcvuUe. |
