. Annual report . rkings are alongthe centre line of mining claims R S C 90 and 91. 184 Bureau of Mines No. 4 The rock containing the silver-bearing veins is quartz diabase, which rises as asill from the east at about 30°. Two hundred feet east of the main workings is anoutcropping of Keewatin greenstone which overlies the sill. The property has been developed from two shafts. No. 1 down 100 feet and Xo. 2to the 200-foot level. When visited in October, 1912, the deepest workings were onthe 300-foot level, where a 50-foot winze had been sunk to the south of No. 2 shaftfrom the 250-foot level. T
. Annual report . rkings are alongthe centre line of mining claims R S C 90 and 91. 184 Bureau of Mines No. 4 The rock containing the silver-bearing veins is quartz diabase, which rises as asill from the east at about 30°. Two hundred feet east of the main workings is anoutcropping of Keewatin greenstone which overlies the sill. The property has been developed from two shafts. No. 1 down 100 feet and Xo. 2to the 200-foot level. When visited in October, 1912, the deepest workings were onthe 300-foot level, where a 50-foot winze had been sunk to the south of No. 2 shaftfrom the 250-foot level. The property has been developed on six revels, while the orewhich occurs in shoots has been stoped out above the 140-foot level. There is anotherstope on the 250-foot level. Development has shown that there are two main vein systems, called No. 1 andXo. 2. These have a general strike of X. and S. and are inclined slightly to the No. 2 system has produced nearly all the ore and consequently the development. Fig. S7.—Miller Lake—OBrien mine. work has been mostly done there. It contains two series of veins, called hanging walland foot wall veins respectively. In each of these systems there are two or more veins which, where the ore shootsoccur, have been sufficiently close to mine in one stope. In the ore shoots individualveins are not always productive, but, when one is barren, a parallel one may carryhigh-grade ore. Both the hanging and foot wall veins have shown ore shoots. Abovethr 140-foot level ore has been stoped from both the hanging and foot wall veins, whilebelow this level, to the south of the main shaft, the ore has been produced from thefoot wall system of veins. Very little ore was found above the 60-foot level. In theworkings on the 250-foot level, 125 feet south of the main shaft, a silver-bearing veinwas discovered which has an E. and W. strike. This vein had been drifted on for170 feet, and ore was being stoped above this level. Tin great proportion
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