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v.— ON RECENT ADDITIONS TO OUR KNOWLEDGE OF THE 

 GOLD-BEARING ROCKS OE SOUTHERN INDIA. By Y. 

 BALL, M.A., E.R.S., F.G.S., Professor of Geology and Minera- 

 logy in the University of Dublin. 



[Eead, February 19, 1883.] 



Three years ago, "when I read before this Society an account of the 

 " Mode of Occurrence and Distribution of Gold in India," I pointed 

 out that the available information as to the geology of some of the 

 regions which were then attracting the notice of gold mining com- 

 panies was very imperfect. 



Recently this deficiency has to a considerable extent been 

 removed by the publication of a Paper by Mr. B. B. Foote, of the 

 Geological Survey of India,^ in which he has suggested the exist- 

 ence of a correlation between the gold-bearing rocks now known 

 to exist at the several localities where mining operations have com- 

 menced, and at some others where the occurrence of auriferous 

 sands has been ascertained. 



The subject, as I propose to treat it, deals especially with the 

 geological aspect ; but since so large an amount of capital — upwards 

 of £3,000,000 — has been invested in companies, it is natural that 

 a great number of people should regard with particular interest 

 the economic side of the question ; for this reason, therefore, I 

 think it desirable that I should make some preliminary remarks 

 on the productiveness of Indian mines. 



In the absence of detailed and thoroughly trustworthy accounts 

 of operation's at particular mines, it is necessary to be somewhat 

 general in our statements, and yet this is a subject by no means 

 well suited for such a method of treatment. 



About a year ago I was challenged publicly at a meeting in 

 London to state at what depth the quartz reefs would be most 



^ Notes on a Traverse across some Gold-fields of Mysore, Eecords of the Geolo- 

 gical Survey of India, vol. xv., 1882, p. 191. 



SCIEN. PEOC, R.D.S. — ^VOL. IV. FT. I. D 



