Identifier: transactions14cana (find matches)
Title: Transactions
Year: 1895 (1890s)
Authors: Canadian Institute of Mining and Metallurgy
Subjects: Mineral industries Mines and mineral resources
Publisher: Montreal (etc.)
Contributing Library: Gerstein - University of Toronto
Digitizing Sponsor: University of Toronto

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relation with information obtained in the not far distant and evi-dently similar districts of Ontario, namely Larder Lake, Porcupineand Abitibi. Relative Positions of The Districts. The Opasatica district is in Quebec, on the height of landaround the north end of Lake Opasatica, or about forty miles ina direction slightly east of north from the north end of LakeTemiscaming. From Opasatica, the Larder Lake district lies inOntario about fifteen miles to the southwest, the Porcupinedi.strict is about 100 miles a little north of west, Abitibi is aboutfifty miles to the northwest. The relative positions are wellshown in the accompanying plan. As the general geology will not be discussed, this may bedismi.s.sed with the statement that the succession of Keewatin,Laurentian and Huronian is similar to that so frequently describedfor Cobalt and the other areas in this Temiscaming district. ♦By permi.ssioD of the Superintendent of Mines of Quebec. Telluride Gold Ore at Op.vsatica—Harvie I Go
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Key Pi-axShowing Opaaatica, Larder, Porcupine, and Abitibi roM arva.. 166 Telluride Gold Ore at Opasatica—Harvie Opasatica.—The gold is associated with quartz-ankerite fis-sure veins, although in one instance the ore body is a rusty weather-ing dike of a dioritic rock cut across by very numerous smallquartz veins which carry the values. The country rocks are ofKeewatin or Huronian age. The largest vein observed averagedabout two and a half feet wide in an exposure of one chain in length,and it may be said that all of those examined hold their widthwell. The gangue is quartz, partly massive, partly in free crystals,in both cases being commonly banded with ferruginous dolomiteor ankerite and carrying sericite. In varying amounts pyrite,chalcopyrite, petzite and free gold also occur. In some instanceschalcopyrite forms a large proportion of the vein matter, and thewall rock on either side is also heavily charged with sulphides,probably chiefly iron pyrite. The values are obtained bot

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