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-?- <br />MINING AND MINE METHODS. <br />i <br />Tho Frontenac IIo. 1 shaft is 700 foot deeg. {7ork is <br />boing oarried on inainking tho abaft and in driving <br />the aizth level at tiro 60o ft roast, i7:e shaft is in- <br />tersected by a tunnoll, driven years ago, intersooting the <br />shaft at 3DO feet. This tunnel beyond the shaft is oaved, <br />but opon to the shaft as a main air courso. <br />Maahina drills are used exclusively. Limo is tim- <br />bered vrith pins and spruce atulla and lagging. <br />'_Jo orator to inco:.vonionoo corking is encountorod. <br />An 8 in.elootrio oxhaust fan assists tho ventialtion. <br />Tho shaft is dividod into two compartrlents, and <br />tha lighting upon tho aur:aoc is olectria, with oandles ' <br />undorground. i <br />I~ <br />t~ <br />~~7 <br />