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-~- <br />_ MIN INC AND MINE METHODS. <br />The Frontenac loo. 1 shaft is ^00 feet deep. Aork is <br />being oarried on insinkin.; the shaft and in driving <br />the sizth level at the 60o ft west, the abaft is in- <br />.terseoted by a tunnoll, driven years ago, interaooting tae <br />.shaft at 3DO feet. This tunnel beyond the shaft is oaved, <br />but open to the shaft as a >=ain air oourso. <br />ldaah ine drills are used exclusively. LSino is tim- <br />borod vrith pine and spruoe atulls and lagging. <br />.:o water to incorvonionco corking is enaountorod. <br />An 8 in.elootrio exhaust fan assists the ventialtion. <br />The shaft is divided into t•rro compart~enta, and <br />the lighting upon the surfaoe is electric, vrith oandles <br />underground. <br />i~ <br />~~ <br />j <br />_~r <br />