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Barnadete - 4. <br />JL•IBI.Ba & MIKE METHODS . <br />The main opealag le a prow-oat tunnel 8S0' in length <br />and timbesed for the, brat 76' with poets and oape. The tun- <br />nel le driven on a uniform grade of 1,~ sad is 4~' a Cry' in the <br />olsss. At a diatanoe e~ 13b' from the portal the Bernadet• Ho. <br />1 mein is intereeoted. At 3b0' the Bernadete Ho. 2 vein ie in- <br />tereeoted. At 7Zb' ae..a oY this vein in intereeoted.-A number <br />of ether veins have been intereeoted by the tunnel and short <br />drifts run oa enoh aide on ell of them. Bo eteping has been <br />done. <br />Aotive work 1e confined to extending the main tunnel and <br />driving the drifts on Bernadete Hq's. 1 and 2 wine. <br />IIo addit~oaal Bait 1a provided but reoommendatione have <br />bees given •to at oape make ea upraise to the eurieoe at a die- <br />tano• of about 160' from the portal of the tunnel, properly <br />equip the same with safe, eeours and eooeesible ladders and <br />also plnoe good sad airtight doors between the portal and up- <br />raise, the doors to be eo arranged that they aen be operatd <br />from without. i,a <br />Overhand eteping and drifting ars the methods employed I' <br />far the sxtreotion of ors. Siagls hand drilling is done but no <br />meohins drills ars need. <br />i are em- <br />Poets sad oape and atolls banked with lagg ng <br />ployed for timbering. The timbers are prepared by hand from red <br />!, <br />eprnoe and pile, are is good oondition and euffioient in ei$e <br />and number to insure safetJ. <br />IIndergrowid treamia8 ie done by head. Steel Dare are <br />employed and the traokage ie 18" gunge and 8~ T rails. <br />~inege is natural. An 8-inoh pipe attaohsd to a fur- <br />'aaoe is used for improving the ventilation. Ho aoalous gases <br />;are met with sad the ventilation is good. Sanitary oonditione <br />are good. Candles ere used for lighting underground. <br />S T 6 T I S T Z C S. <br />Total somber of feet is tunnels. 8b0. <br />