File:Transactions (1895) (14771150614).jpg

Identifier: transactions10cana (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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sh Columbia, not only in Boundary and Franklin,but in other districts as well, and will, no doubt, be recorded froma great many localities. From descriptions of copper and magnetite deposits in theSimilkameen, Kamloops and the coast, it w^ould appear to the^\Titer that examples occur in these localities. On the outskirtsof the Rossland Camp the same type occurs, and transitionaltypes to ordinary lodes and veins are widely distributed. It has not been absolutely determined for Franklin Campwhat intrusive rock has been responsible for the metamorphismand mineralization. The possibilities are the granodiorite, thealkali syenite, and the undiscovered or unrecognized plugs ordykes which gave vent to the lavas. The first is in closer prox-imity to the deposits in large exposed areas, but the second iswell represented by large dykes; of the third, as no information isat hand, nothing may be said. The granodiorite is itself deformedand mineralized; the alkali syenite at certain points in this
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41 Geology and Ore Deposits of Franklin Camp, B.C. 177 section is responsible for mineralization and seems to have beeninjected just prior to the great period of ore formation. Boththese rocks are present in the districts in southern British Columbiavisited by the writer, which are characterized by this class of de-posits. At present, the balance of the evidence seems to be ratherin favor of the alkali syenite as the metamorphosing rock. In theBoundary district the large syenite porphyry dykes seem to havebeen furnished the mineralizers.(l) In a recent monograph (2)Lindgren ascribes the origin of the Clifton-^Iorenci contact de-posits to porphyry dykes. The contact metamorphic deposits, while distinguishedby Von Goddick in 1879, have only in recent years beenrecognized as an important type, found in a large number of cop-per gold districts, but an extensive literature on the subject isnow being rapidly accumulated.(3) Of the more important deposits of this class maybe mentioned some o

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