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.y. ~xwh ~'~ r 37"~ <br />f R~' h, <br />~;k '4, .s, ~+ <br />'-hf <br />v.... <br />brill development is accomplished <br />with two and three boom, d~eseh <br />po~.vered Jumbos, which can drill a 45~ <br />hole, ll~ft round in less than 3 hr. <br />Eight three boom and six two~boom <br />diesel powered jumbos are used for <br />drilling drifts, while four lwo~boom <br />air powered tan drills are used for <br />drilling the bells. To accomplish un~ <br />dercutting, operators use four two <br />boom, air powered ring drills. One <br />two boom, au powered jumbo is en~ <br />gagetl in boundary cutoff drilling. All <br />drills are rubberhred. <br />Pressure vessels of 30016 ANFO ca- <br />pacity are used to load blastholes <br />pneumatically, while stick powder is <br />used in wet areas antl loaded by <br />hantl. The proposed primary blasting <br />system will use ANFO, bottom pnm~ <br />mg, 200~grain tletonating cord boos4 <br />ers, an ms~delav system, and 7 5 <br />grain detonating cord trunk lines. An <br />extentlable, single boom minrjumbo <br />will be used to drill boulders in the <br />bells, antl these holes will be charged <br />with stick or gelatin powder and feed <br />with fuse, caps, and detonating cord <br />Powder antl caF~ magazines are to <br />Gated on both the 8,100 and 7,500 <br />IE vets. <br />