PRESIDENTIAL ADDRESS. 17 



South Wales have been favourite prospecting localities by 

 miners in the search for tin. Later, when wolfram became 

 valuable, these granite margins or the country rock along- 

 side were found to hold most of this tin associate. Molyb- 

 denite and bismuth also were found to occur in commercial 

 quantity in pipes or in tortuous channels, somewhat like 

 bent cylinders. These deposits were found almost wholly 

 within the granitic margins and not in the country along- 

 side. Moreover, these granites differed from the tin and 

 wolfram granites in that they were less sandy, and, as a 

 rule, were much coarser in the texture of the base. These 

 granites, however, are intimately related to the associated 

 granite types, and the various types merge into each other 

 in places. The prospector thus becomes perplexed in his 

 quest for minerals and loses one granite within another. 



During the past year the report — Mineral Resources, 

 No. 25 — The Limestone Deposits of New South Wales, 

 by J. E. Oarne, Government Geologist, and L. J. Jones, 

 Assistant Geological Surveyor, has been issued. The work 

 is most complete and conforms with the scope outlined in 

 the Presidential Address for 1917. The importance of the 

 industry is evidenced by the following figures: — 



(a) Amount and value of cement produced in New South 



Wales, 1917, 112,850 tons, value £347,381. 



(b) Lime, 1917, 26,090 tons, the value on truck varying, 



according to locality, from £1 10s. to £1 14s. 6d. 

 per ton. 



(c) Marble. Many of our marbles are of a highly orna- 



mental character and will prove to be of considerable 

 architectural value. 



Mineral Resources No. 27. The Hill End and Tambaroora 

 Goldfield report has been prepared by Mr. L. F. Harper, 

 Geological Surveyor, and will doubtless lead to the revival 



U— May 7, 1919. 



