36 ANNIYEESAUT ABDEESS. 



of the working of a great number of those recently discovered. 

 Still, the produce of such as can be worked will doubtless, in no 

 long time, sensibly affect the tin-markets of the world ; in fact, it 

 seems not unlikely that the production of tin ore in this part of 

 Australia will reach, if not surpass, that of all the old tin-miniug 

 countries combined." 



These two papers are very important, as giving the settled 

 opinions of persons whose word may be taken. No guarantee is 

 required ; but I may add that some of the facts stated were 

 notified by me in 1853, especially the way Wolfram occurred at 

 Dundee, from which locality and for many miles northward on 

 the eastern side of the great granite platform, I have a collection 

 of rocks and ores that enables me to confirm of that side what 

 Messrs. Alpin and TJlrich say of the western side. 



(3.) Let me conclude these selections by a reference to another 

 of the officers of the staff of the late Victorian Survey, who is 

 now attached to this Colony, and whose experience will make him 

 of great service in the district between the Murray and the Mur- 

 rumbidgee, where he is at present employed. I mean Mr. C. S 

 "Wilkinson, who some time since published an excellent Eeport 

 on the Inverell and Cope's Creek country. 



Mr. Willdnson's Eeport is in close agreement with those before 

 quoted, and with my own explorations in the vicinity of his 

 researches made in the year 1853 ; but he has, however, made 

 some advances in the development of the structure of the tin 

 country. He points out variations in the composition of the 

 granite, its change from ternary to binary character ; and shows 

 how it becomes porphyritic from the admission of orthoclase 

 felspar, just as Mr. TJlrich found it at Elsmore. Radiating 

 crystals of schorl were also observed by him, and smoky quartz 

 in the geodic hollows of the granite. 



Greenstone of a somewhat peculiar kind, with epidote, also 

 occurs on Cope's Creek, where it is traversed in places by dykes 

 of entire granite running N.W. These are split up by vertical 

 joints parallel with those in the main granite, striking E. 5° N. 

 In the greenstone occur quartz veins which are believed to be 



