Canadian mining journal July-December 1915 . deepbay east of the inlet there is a massive diorite. which,in places, shows a gradation from fine grained tocoarsely crystalline. In the eastern part of the lake, *a grey-quartz diorite and an epidote granite are mix-ed with the schists. On a small island three milessoutheast from the inlet, there is a band of sericiteschist, eight feet wide, striking N. 78° E. and on the west side of this band there are about12 inches of ochreous powder containing masses ofbluish quartz mixed with the sericite schist. The sur-rounding rock on the is
Canadian mining journal July-December 1915 . deepbay east of the inlet there is a massive diorite. which,in places, shows a gradation from fine grained tocoarsely crystalline. In the eastern part of the lake, *a grey-quartz diorite and an epidote granite are mix-ed with the schists. On a small island three milessoutheast from the inlet, there is a band of sericiteschist, eight feet wide, striking N. 78° E. and on the west side of this band there are about12 inches of ochreous powder containing masses ofbluish quartz mixed with the sericite schist. The sur-rounding rock on the island is finely schistose, and ofa dark grey color. All three of the hand specimensbrought from these bands effervesce somewhat freelywhen touched with dilute hydrochloric acid. A sim-ilar band of sericite schist occurs on another islandabout a mile and a half farther north. Several ex-posures of diabase and fine grained greenstone occuron the neartheast shore and adjacent islands. Aboutthree miles from the foot of the lake on the west side. 560 THE CANADIAN MINING JOURNAL September 15. 1915 there is an outcrop of coarse muscovite. gneiss con-taining- small garnets. North of this to .the end of thelake, and for some distance down the river, there areexposures of hornblende and biotite schists, followedby granite and gneiss. For some distance below 0Sullivan lake the born-blende schist, biotite gneiss and granite are intermix-ed, but as the river is descended, and before Percylake is reached, a rusty weathering, garnetiferousgneiss, interfoliated with diorite gneiss, and in placeswith finely banded syenite gneiss and biotite schist,is the prevailing rock, and is seen in frequent expos-ures. The biotite schist sometimes forms a consider-able portion of the rock. These rocks are generallywell foliated; they strike nearly east and west, anddip northward at an angle of from 30° to 50°. In go-ing down the river the last large exposure of theserocks is seen at the eighty-ninth mile
Size: 1323px × 1889px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectminesandmineralresou
