774 E. C. ANDREWS 



inseparable associate in New South Wales; thus great amounts of 

 the molybdenite have been lost. 1 



Queensland, in its eastern portion, should be considered as 

 belonging, probably, to the same geological province as New- 

 England, or Northeastern New South Wales. 



The tin, wolfram, molybdenite, and bismuth deposits are found 

 only within the eastern strip of the state, and their age appears to 

 be the close of the Permo-Carboniferous. The granites and mineral 

 associations of the two areas are almost identical also. Thus this 

 great province of Eastern Queensland and New England, which has 

 yielded the bulk of the world's supply of molybdenite, lies on a great 

 flat arc having a general trend of northwest to north-northwest. 

 These ore deposits are associated with strong movements of folding, 

 the age of which appears to be closing Paleozoic. 



The approximate values of the tin, wolfram, molybdenite, and 

 bismuth won from Queensland are respectively £9,000,000 to 

 £10,000,000, £1,000,000, £250,000, and £150,000. 



It would thus appear that the deposits of the tin and molybdenite 

 group of minerals in the great geological province of Western 

 Australia, South Australia, and the Northern Territory are of 

 great age, but that they are almost negligible in commercial value. 

 It is not known, however, what proportion of this absence is due to 

 removal by erosion of the upper portions of the granites. The 

 deposits of this group in Tasmania may be of closing Silurian or 

 early Devonian age, the tin values being very large, but wolfram, 

 molybdenite, and bismuth are unimportant; the deposits of the 

 geological province of Southeastern Victoria and Southeastern 

 New South Wales are important and are post-Devonian and 

 pre-Permo- Carboniferous in age; while the deposits of the prov- 

 ince of New England and Eastern Queensland, forming a coastal 

 fringe to Northeastern Australia, are highly important from a 

 commercial point of view and appear to be closing Paleozoic 

 in age. 



1 Official reports have been written on the tin and molybdenite areas of New South 

 Wales by T. W. E. David, J. E. Came, and the writer, while Professor Leo A. Cotton 

 has published reports on the tin of New England in the Proc. Linn. Soc. N.S. Wales 

 XXXIV (1909), 738-81; Cotton intends to continue the study of tin genesis in 

 Australia in the near future. 



