Magmatic ore deposits of Sudbury, Ont; discussion

W. H. Goodchild
1918 Economic Geology and The Bulletin of the Society of Economic Geologists  
Sir:--The Sudbury occurrences are of such profound interest to students of ore deposits that the two articles by Drs. Bateman and Coleman in your August issue have doubtless been studied by many in the hope of finding some convincing solution of the vexed controversy in regard to their origin. Dr. Coleman alludes to my recent work on the Insizwa deposits of South Africa, which to some extent resemble those at Sudbury, and he points out that I regard them "as undoubtedly due to gravitational
more » ... o gravitational segregation." At the time when Dr. Coleman wrote his article my reply to the discussion that ensued on the reading of my paper before the Institution of Mining and Metallurgy had not been published. Several speakers alluded to the Sudbury controversy and one geologist in particular, of high repute, was quite as confident that my view of the Insizwa was wrong as I am that it'is right. Now I fully realized at the time my Insizwa paper was written that without a convincing solution of the Sudbury problem, the interpretation I have given of the Insizwa deposits would be open to the same controversy. My position in regard to the Sudbury occurrences is that stated by Dr. Bateman, namely, one whose field experience of the Sud'bury occurrences is limited, so I consequently did what he has done, that is to say, investigate the literature pertaining to the deposits and study the rocks and ores by means of thin sections and polished
doi:10.2113/gsecongeo.13.2.137 fatcat:6ontjy6rk5cizpg3hmithac3ae