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Published March 1947 | public
Journal Article

Control of ore by primary igneous structures, Porcher Island, British Columbia


The ore deposits at Surf Point and Edye Pass Mines, Porcher Island, British Columbia, lie in a quartz diorite stock. They are a series of auriferous quartz-pyrite veins occurring in a N. 20°E. zone along the axis of an arch of flow layers. Strong N. 30°E. shears in an adjacent to the stock aided in the enlargement of the magma chamber. The same stresses acting in the arch formed the ore-bearing structures by a series of small transverse movements involving the primary joints. Study of the internal structures gave valuable information on the form of the stock and the extension of the ore-bearing zone.

Additional Information

© 1947 The Geological Society of America, Inc. Manuscript received by the Secretary of the Society, May 6, 1946. The writer is indebted to Dr. V. Dolmage for suggesting application of the Cloos methods to the problem of control of the ore deposits. The field work was completed in the summer of 1938. The writer wishes to express his sincere thanks to Dr. Ian Campbell of the California Institute of Technology, under whose guidance and supervision the study has been completed.

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