114 The Ottawa Naturalist. July 



REVIEWS. 



The Gold Measures of Nova Scotl\ and Deep Min- 

 ing, by E. R. Faribault, B. A. Sc, Geol Survey of Canada. — 

 1 1 pp. with two maps and a number of illustrative sections. 

 Paper read before the Canadian Mining Institute.March, 1899. In 

 this very valuable addition to the literature of Economic Geology 

 Mr. Faribault presents in a most concise and readable form 

 his conclusions as to the mode of occurrence of gold in Nova 

 Scotia. Dealing first with the extent of the gold measures, Mr. 

 Faribault estimates that they cover 5,000 square miles. They 

 consist of an upper or state group, two miles in thickness and a 

 lower or quartzite group, 3 miles in thickness and are probably of 

 lower Cambrian age. Since their deposition on a sea floor they 

 have been very uniformly folded into a series of anticlines and 

 synclines roughly parallel with the coast line. The auriferous 

 quartz veins have been deposited at the summit of these anti- 

 clines and along certain lines on either side of and parallel to 

 the axes and their deposition has been due to the loosening and 

 opening up of tha strata along the planes of sedimentation. 

 Though the original bedding in these rocks is masked by a 

 uniform cleavage subsequently developsd, Mr. Faribault has 

 been able, by close structural work in the field, to fix accurately 

 the anticlines and twenty-one domes or cross undulations 

 affecting the anticlines and defining the occurrence of payable 

 reefs. Although granitic intrusions are common they have 

 occurred subsequent to the filling of the gold veins and in no 

 way affect their richness. Mr. Faribault's theories as to the | 



position and extent of the pay steaks and his advice as to the i 



lines along which deep mining should be prosecuted must be of - 



the greatest value to the practical miner, and his comparison of ] 



the Nova Scotia district with that of Bendigo, Australia in the 

 matter of deep mining is most instructive and encouraging. 

 The paper altogether is most valuable and exemplifies in the 

 clearest manner the necessity of good structural work, carried 

 out in a scientific way, in the development of a mining district 



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