Identifier: annualreport192000onta (find matches)
Title: Annual report
Year: 1891 (1890s)
Authors: Ontario. Dept. of Mines
Subjects: Mines and mineral resources
Publisher: Toronto
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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)osition is believed to have followed the intrusion of the syenite andporphyry, since these formations are in close association with the gold de()osits,while the diabase dikes and conglomerate of the Cobalt series are later than thegold deposits. The acid intrusives occur at various points from the west Itianch 1920 Matachewan Gold Area 55
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aN393T 56 Department of Mines No. 4 easterly to Cairo township, the largest area being a mass of red syenite in Cairo andAlma townships. Xumerous small masses of porphyry occur to the north of David-son creek, and along the Montreal river, north of Matachewan Mines landing.Frequently the acid intrusives are massive and fresh in appearance, and again maybe greatly altered and partly schistose. Some of the red porphyry shows distinctphenocrysts of feldspar. Such a rock is seen in the larger masses of orthoclase orsyenite porphyry on the Davidson claims. A narrow dike of this rock intrudes olderporphyry on claim 5376. A granite porphyry exposed in the central part of claim5406, south of Matachewan gold mines, is greatly altered to schist, and is an older-looking rock than the syenite porphyry. A similar rock occurs on the east and westshores of the south bay of Otisse lake. A fine-grained, red hornblende syenite,quite massive, occurs on the west shore of the Montreal river, one-half mile

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