AlWIVEESAEY ADDBES3. 29 



The present yields of stream and tin ore and matrix tin have 

 thus grown out of these various introductions of the new" industry ; 

 but in neither Colony is the " discovery'''' so " very recent''^ as has 

 been represented. 



In the course of a discussion on the letter in which the words 

 italicized occur, Mr. David Forbes said, at the Greological So- 

 ciety's meeting in December, 1871, that he had received specimens 

 of the granite from the New South Wales tin region, in tlie year 

 1859, and that he found them to be perfectly identical with the 

 stanniferous granites of Cornwall, Spain, Portugal, Bolivia, Peru, 

 and Malacca. 



I may add that in the gigantic elements of the granite in various 

 parts of New England, and the association with the tin found in 

 the granite, of certain minerals, such as molybdenite, wolfram 

 antimony, and iron of various kinds, and with schist, the identity 

 is much closer than would appear from the species of the granite 

 composition themselves. 



Some of the largest and longest crystals of quartz and felspar 

 that were ever seen occur at Oban and Bolivia and in some other 

 localities. 



Mr. P. G-regory has reported to the Queensland Government, 

 and the account has been forwarded to England, that having 

 measured 170 miles of creelis and river-beds in that part of 

 Queensland which touches the northern boundary of New South 

 Wales, he found, on calculating the value on a fair assumption of 

 the average amount of stream tin (irrespective of vein or matrix 

 tin) that it amounted to thirteen million pounds sterling. 



I would riemark here, that tin seems subject to a similar law to 

 that which affects gold. The metal, whether gold or tin, is 

 generally found in alluvial deposits, richer in quality than in 

 the matrix, at small depths. As affects gold, this has been 

 proved in Bolivia, New Granada, Chili, and Eussia, as well as in 

 parts of Australia ; and as relates to tin, the statement rests on 

 the testimony of Mr. Henwood. (Q, T. Cornwall, IV, p. Q5.) 



