30 AMflYEESAET ADDHESS. 



Geologists at Home have settled it that the stanniferous granite 

 are Palaeozoic, pre-Permian, and post-Silurian. 



The stream tin must, of course, be quaternary or recent in its 

 present position. Tin stone has been found loose in the bed of 

 the Shoalhaven, but the actual lode has never been discovered. 

 In several other, localities tin is known to me as having been 

 found, either as stream tin, or wood tin, in the ordinary gold 

 drifts with other loose minerals, — indications, as I consider such 

 instances, of future discoveries in parts of the Colony not yet 

 searched. 



In more than one case the tin reduced from the peroxide, 

 either by accidental fires, or by miners who did not know what 

 they were doing, has been found by me. In one instance silver 

 was stated to me to have been found ; but on inquiring on the 

 spot I was led to the conclusion and reported my conviction that 

 it was tin which had occasioned the mistake.* Tin ore is, therefore, 

 far more common in our granite country than has been suspected. 



The great granite masses in this Colony are not, probably, all 

 so richly endowed as some particular spots which are now found 

 so prolific ; but having seen the greater part of them, I am im- 

 pressed with the opinion that for centuries to come the industry 

 now commenced will continue to occupy a prominent position 

 among the producers of Colonial wealth, just as the mines of 

 Tenasserim, Merghui, and Malacca have not decreased in value 

 since the commencement of their working. In Malacca many 

 of the lodes are horizontal. The average produce of the above- 

 named mines is from 60 to 80 per cent., and its value is reckoned 

 at nearly 4<\ millions per annum. 



The Island of Banca has mines, first discovered in 1799, which 

 some years since supplied an annual amount of 3 millions sterling. 

 The tin there is associated with iron in veins at the junction of 

 granite and sandstone, 



In all these countries to the north of us the tin is always in 

 the state of peroxide. 



* See my Report of 14th February, 1853. 



