ANNIYEESART ADDRESS. 37 



auriferous, as alluvial gold was found hard by. The veins and 

 joints seem to be faulted by successive slips, so as to give the rock 

 a resemblance to a sedimentary deposii . Eex's ground, on Middle 

 Creek, Cope-Hardinge mine near Tiengha, and a still wider area, 

 exhibit the same phenomena. Where the strike of the veins and 

 joints is meridional, no minerals have been found ; only in the 

 newer, or E. 5° N. and N.E, direction, tin lodes occur near Cope's 

 Creek. 



In the boundary tin mines, veins of quartz in the granite, 

 striking E. 20° N"., with a very high angle of dip, carry tin as well 

 as the walls of granite. Eelspathic dykes traversing porphyritic 

 granite, E. 15° to E. 20° N., near Sutherland's "Water, carry 

 quartz veins with tin. Solid lodes of tin occur also in other 

 localities, in the centre of euritic dykes, going E. N.E. , and nearly 

 vertical. Similar cases present themselves to the south-westward, 

 bearing E.N.E. Eleven thin seams of Cassiterite have been 

 found here in a width of 5 feet. Iron pyrites, galena, and 

 copper in a quartz dyke, are found on Darby's Creek in the 

 granite, going E. 20° N. 



These examples are sufficient to point out the character of the 

 country and the main features of the lodes. 



Loose tin occurs in places of considerable size, rounded some- 

 times as by water, like the drift quartz with gold, which much 

 resembles the Victorian Tertiary drifts. I have no doubt myself 

 that those drifts, especially when between granite and the over- 

 lying basalt, which also occur in the same neighbourhood, as well 

 as the quartz veins in the greenstone, are auriferous, and that 

 much of the loose tin is of the same age as distributed with the 

 other drift. I have before mentioned that I found Cassiterite in 

 various places of the granite region in New England, with gold 

 and gems.* And in a letter not long ago received from Mr. 

 Wilkinson, he gives me a drawing of some curious diamonds from 

 Cope's Creek ; and some were brought to me long before from 

 Boro, having exact resemblance to those from Suttor's Bar, on 

 the Macquarie. 



* See Trans. Roy. Soc. N.S.W., 1872, p. 67. 



