58 THE PROSPECTOR'S HANDBOOK-. 



New South Wales. In lodes through Silurian, Devonian, 

 and Carboniferous rocks. In lodes at junction of diorite 

 and serpentine ; also through diabasic rocks. In sandstone, 

 conglomerates, &c. 



Queensland. In quartz veins, mostly through metamor- 

 phic rocks, though sometimes through granite and syenite, 

 and in alluvial deposits derived from these. At Mount 

 Morgan the auriferous deposit has probably been the result 

 of a geyser, the gold being contained in a siliceous sinter. 

 In some parts the matrix is aluminous ; in others, ironstone 

 predominates. Also in lodes through diorite. 



West Australia. In ordinary lodes or compound lodes 

 in diorite (notably in Coolgardie district), in diabase, in 

 diorite schist, micaceous schist, chlorite schist, hornblende 

 schist, talcose schist, granite, slate, shale, kaolin, serpen- 

 tine, &c. In some places the lodes are interbedded with 

 schists. The countiy rock of the Black Flag district is 

 hard felsite, porphyry, &c. 



At the Great Boulder the gold-bearing rock contains a 

 mixture of quartzose ironstone, felspathic material, &c. 

 The veins run through hornblendic and diorite schist. 



Gold is found at Hannan's in diabase dykes, &c. Eich 

 tellurides are frequently found in depth. 



At Nullagine, in the north-west, there are gold-bearing 

 conglomerates (also diamondiferous) somewhat similar to 

 the " banket " of the Transvaal. 



Of some of the minerals in which gold occurs unex- 

 pectedly may be mentioned jaspei;, ' graphite, quartz 

 crystals, chrysoprase. It is also found in sinter, felspar- 

 porphyry, &c., and also disseminated in schist, granite, &c. 



New Zealand. In beds of rivers, in valley bottoms, and 

 on flat land as a deposit, sometimes in a conglomerate for- 

 mation, along the seashore mixed with magnetic iron, in 

 glacial drifts, &c. In quartz veins through metamorphic 

 rocks, also through andesite. 



New Guinea. In auriferous black sand. In a deposit 

 of decomposed slate, quartz rock, and conglomerate, above 

 which are leaf-bearing clays. 



