550 Notices of Memoirs — ^. P. Woochcard — TeUuride Deposits. 



other hand, in Cape Colony and Natal there are evidences of 

 a folding of Post-Karoo age which is not represented in the 

 Transvaal. If a comparison between regions so widely separated as 

 the Southern Transvaal and the Cape be of any value, there seems 

 more probability of the Eand Beds belonging to the Malmesbury 

 Group than to any newer formation. 



IsTOTIOIES OIF 3vnE3vnois,s. 



I. — The so-called Lode Formations of Hannans, and Telluride 

 Deposits, in Western Australia.^ By H. P. Woodward, 

 Assoc. M. Inst. C.E., Memb. Inst. M. & M., F.G.S., etc. 



"ANNANS, as it was originally called, was named after the 

 discoverer, Patrick Hannan, but its name has been recently 

 changed by the Government officials to Kalgoorlie, the native name 

 of a small hill that is situated close to the township. It is about 

 400 miles from Perth by railway, in the East Coolgardie Goldfield ; 

 this field is the smallest, but at the same time it produces the 

 largest quantity of gold of any in the colony. A solid block of 

 country has been taken up upon gold-mining leases, of about 10 

 ■ miles in length and 2 miles in width, comprising over 700 leases, 

 of which some ten produce almost the entire output of gold of 

 the district. 



The great discovery of the district was made at a point about 

 4 miles south of the township, where a group of mines is being 

 worked which bids fair to equal the richest known mines in the 

 world. 



Geology. — The flat surface of the country is covered by a deposit 

 of red loam, beneath which in some places a considerable thickness 

 of blue clay is met with, whilst near the hills it is of only slight 

 thickness. This clay rests directly upon the auriferous series, 

 fragments of which, associated with ironstone and a little quartz, 

 are strewn over the surface, and constitute the dry-blowing patches. 



The low range of hills which extends from Kalgoorlie to the 

 Boulder, consists of hard, fine-grained hornblendic schists, inter- 

 sected by numerous diorite dykes, the whole being capped in many 

 places by deposits of ferruginous claystone. 



The rocks, like most of those occurring in Western Australia, 

 do not appear to be of sedimentary origin, but most probably owe 

 their stratified appearance to crystallization under pressure; and 

 they have since been crumpled into a number of anticlinal and 

 synclinal folds, the strike of the axial planes of which is a few 

 degrees west of north. 



Lodes. — The lodes or formations, as they are called, are decidedly 



peculiar, consisting, as they do near the surface, of an indui-ated 



mottled ferruginous claystone, which has proved in places to be 



extremely rich in gold ; but, strange to state, where such was the 



^ From the Transactions of the Institution of Mining and Metallurgy, October 20, 



