. Transactions . y thismetallographic examination of our specimens, we must come tothe conclusion that the mode of origin of all was the same. Longafter solidification the basic rocks were more or less cracked andbroken, and then solutions deposited pyrrhotite by replacement,etc. Later on the pyrrhotite in turn became strained and brokenand then pentlandite was deposited. The pentlandite was closelyfollowed by chalcopyrite. (6) A. E. Barlow, Nickel and Copper deposits of Sudbury, Geol. Surv.,Canada, Part H. an. Rep. XIV., p. 166. 280 Tne Canadian Mining Institute. We wish to emphasize the fact
. Transactions . y thismetallographic examination of our specimens, we must come tothe conclusion that the mode of origin of all was the same. Longafter solidification the basic rocks were more or less cracked andbroken, and then solutions deposited pyrrhotite by replacement,etc. Later on the pyrrhotite in turn became strained and brokenand then pentlandite was deposited. The pentlandite was closelyfollowed by chalcopyrite. (6) A. E. Barlow, Nickel and Copper deposits of Sudbury, Geol. Surv.,Canada, Part H. an. Rep. XIV., p. 166. 280 Tne Canadian Mining Institute. We wish to emphasize the fact that these conclusions arebased entirely on our specimens, because others who are familiarwith the geological features at large and know the localitiesthoroughly may see a widely different interpretation on our work. In conclusion we wish to thank C. W. Dickson, , Schoolof Mining, Kingston and Professor Kemp, Columbia University,for their kindness in supplying us with the material on which thework was Fig-. I—Creightoii Mine, x 88\.
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