984 Museum of Economic Geology of India. [No. 106. 



last have been traced as far north as Nagpoor, and other intermediate 

 points of connection with the Bundelkund formation may also be found. 



The Himalayas at Kumaon, the AravuUy range at Shekawattee, and 

 the hills of the Nellore district, are the only portions of country which 

 have been worked for copper : very few other localities are yet known ; 

 but in such extensive ranges of primary mountains of similar character, 

 it may be asserted that deposits of copper are not confined to these 

 localities only. 



The AravuUy range is of moderate elevation, and appears to offer 

 facilities for further examination. The Singhana copper mines are at 

 the northern extremity of this range, where the disturbing forces have 

 probably acted with less intensity than elsewhere, and there is reason 

 to believe that the lines of fissure in other portions, especially near the 

 junction of the stratified rocks with granite, may partake of the same 

 cupriferous character. This range has been found to be productive 

 of lead also. 



There is no evidence of tin westward of the Bramahpootra, but 

 it occurs in alluvial ground in many parts of the eastern peninsula, 

 from Burmah to the extremity of Malacca, Sumatra, and Banca 

 where the chief deposit exists ; abundant sources therefore of this 

 metal remain unexplored in the ranges of hills which diverge to the 

 south-east from the great Himalayan chain, to form this peninsula, 

 of which Sumatra and Banca seem but disconnected portions ; and 

 it will most likely appear that Assam, at the northern extremity 

 of this stanniferous country, will also yield tin in its alluvial for- 

 mations, derived from the Himalayas, by which it is bounded. 



These ranges of hills, are likewise the repositories from whence the 



rivers of Assam, Burmah, Ava, &c. receive the gold dust with which 



their sands are charged. 



(Signed) G. B. Tremenheere, 



Capt., Engineers. 



Extract from Letter No. 70, from the Secretary to the Government 

 of Bengal^ General Department^ to Captain G. B. Tremenheere, 

 dated the IZth January, 1841. 



In reply to your letter and its enclosures of the 24th ultimo, I am 

 directed to convey to you the acknowledgments of the Right Honor- 

 able the Governor of Bengal, for the information and suggestions 



