E/MJ : engineering and mining journal . ta-tion behind them on which to base knowledge of futureactivities. H. D. RUHM. New York, Aug 2, 1919 The Dutch East Indies exported to the United Statesduring the first three months of 1918 a total of 6,785,933lb. of tin and 85,751 lb. of potash. In the correspondingperiod of 1917, the exports of tin were 8,908,595 lb., and ofpotash, 47,753 lb. 324 Engineering and Mining Journal Vol. 108, No. 8 Details of Practical Mining Suggestions From Practice for the Superintendent, Foreman, and Miner Water Drain for Wet RoofBy Roy H. Poston In driving a drift to b
E/MJ : engineering and mining journal . ta-tion behind them on which to base knowledge of futureactivities. H. D. RUHM. New York, Aug 2, 1919 The Dutch East Indies exported to the United Statesduring the first three months of 1918 a total of 6,785,933lb. of tin and 85,751 lb. of potash. In the correspondingperiod of 1917, the exports of tin were 8,908,595 lb., and ofpotash, 47,753 lb. 324 Engineering and Mining Journal Vol. 108, No. 8 Details of Practical Mining Suggestions From Practice for the Superintendent, Foreman, and Miner Water Drain for Wet RoofBy Roy H. Poston In driving a drift to be used as a main haulagewayat a mine in Southeast Missouri, the workmen cut sev-eral water-bearing strata that continued to flow afterthe drift was completed. As a means of preventing theleakage of water from the roof, a system of. collectingand draining, shown in the sketch, was satisfactorily in-stalled at a moderate cost and with little consumption oftime. As the continuous dampness made the preservation of 3-2Sfee/Reinforcing Rods^. Section Through Tunnel WATER DRAIN FOR TUNNEL, HAVING A WET ROOF wooden construction difficult, concrete installation wasdecided upon. Considering that this latter type imposespractically no cost for maintenance, and that the wetpart of the tunnel was short, the additional initial ex-pense was considered justifiable and a permanent instal-lation was provided. Improving Top-LandingHaulage Equipment By Louis C. Moore Several changes have been made in the last ten yearsin the methods used for stocking iron ore in the LakeSuperior region, and few of the mines continue to usethe man and car system, which is now replaced by eitherelectric locomotive, haulage or endless-rope or gravitytram systems. The objection to electric locomotivetramming is not so much a matter of expense of equip-ment as it is the danger to which the operator is sub- jected, for records show many instances of locomotivesthat have jumped poorly-constructed ore-trestle tracksand la
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Keywords: ., bo, bookcentury1900, bookdecade1910, booksubjectmineralindustries
