42 



1156, 1148, Cowra Creek, and 2041 Flyer's Creek, slate show 

 gold on the cleavage faces. 



Yass. — 7350, Nanima Gold-field : quartz with sulphide of 

 hismuth, assaying 1 oz. 7 dwt. gold per ton and 6'3 per cent, of 

 bismuth. The stone is concentrated and sold as a bismuth ore. 

 Tetradymite and montanite also occur at this mine (see page 91). 



8728, Murrumbateman : a gold ore of very unusual character. 

 It consists of an aggregation of garnet crystals and assays 3f oz. 

 of gold per ton. 



5318, Dairy Creek, Gundaroo : an attractive specimen showing 

 free gold abundantly on arsenical pyrites. 



Erom the By wong and Guudaroo Fields are numerous samples 

 of auriferous quartz, which is frequently characterised by its 

 blue colour and glassy lustre — e.g., 6755. 6720, Johnston's 

 Claim, Bywong, differs entirely from the rest of the specimens. 

 It is probably a portion of the country-rock impregnated with 

 metallic sulphides ; the assay value is 1\ oz. of gold per ton. The 

 country-rock at Bywong is sedimentary origin (5308-9). 



Braidwood. — The ores from Braidwood and Major's Creek are 

 generalh' rich in pyrites ; they sometimes contain fahl-ore and a 

 good deal of blende. 9115, Hanlon's Beef, Major's Creek : a 

 portion of a vein in which quartz with iron- and copper-pyrites, 

 blende with galena, and finally fahl-ore — the steely gray mineral 

 — are successively met with in passing inwards from the walls. 

 As the filling-up of a vein by mineral-bearing solutions necessarily 

 begins with the walls, fahl-ore must have been the latest mineral 

 deposited. This ore assays 6i oz. gold and 55 oz. silver per ton. 



The pyrites from Major's Creek is sometimes crystallised in 

 cubes (2574). 



5617, Hornblende granite : the country-rock of the Major's 

 Creek Gold-field. 



Tumut, Talwal, Moriiya, Wagonga. — At Batlow gold occurs in a 

 curious complex of metamorphic rocks diflSicult to understand — 

 e.g., 5462. Gold is sometimes visible in them (5461). 



