Geologij of the J)i(uiiou<l Creek Area. -t^'S 



from various localities, and he has shown that in IG cases the gold 

 occurs with the stibnite, in 7 cases disseminated through it. and 

 in 4 cases intergrown with it. The above-mentioned section shows 

 well the contemporaneous origin of the gold, quartz and stibnite. 

 Pyrite occasionally occurs in the quartz veins associated with the 

 gold, and in the 800 feet level small crystals of sphalerite were 

 present. 



Section A4, slate vein, GOO feet level south, Diamond Creek mine. 



Quartz, sericite, carbonate, pyrite and stibnite are the minerals 

 present. A series of roughly parallel Avave-like fractures pass 

 through the grains of quartz, and sericite and carbonate have 

 intruded along these planes and replaced some of the Cjuartz. 

 Marked granulitisation of the quartz grains occurs. Pyrite and a 

 little stibnite are present along cracks and through the vein. 



7. — Geology of the Diamond Creek Mine. 



The Diamond Creek mine is situated on a hill just to the east 

 of the Diamond Creek, and just south of the railway station of the 

 same name. At present it is the only mine working in the field, 

 although the " Allendale " Conqjany is about to recommence opera- 

 tions. Of late the working of the mine has been carried on with 

 very fair results. For the half-year ending July 19th, 1912, 2009 

 tons of ore were crushed, yielding 2835 ounces of gold, giving an 

 average yield per ton of 28.2 pennyweights. Five sixpenny divi- 

 dends have been paid since the beginning of the year, and during 

 the same time the shaft has been sunk a further one hundred and 

 fifty feet. The main shaft is sunk vertically for 700 feet, and then on 

 the underlay of the dyke for a further 280 feet. Most of the 

 development work, especially in the lower levels, has been done 

 north of the shaft. The reefs in the bottom levels Avere of very 

 fair value, and there seems no reason why ]Hirm;nifnrf in ilcptii 

 of the gold bearing veins slioidd not be realised. 



(a) Ftaf tires of the sih/r/an, structural and Uthological. 



The chief structural features of the silurian have been dealt with 

 before. Near the mine the silurian' consists of shales and sand- 

 stones and rarely small Viands of l)lack slate. These, when tliey 

 occur in proximity to the dyke, ai-e frequently changed to graphitic 

 slate. Bands and small lenticular segregations of carbonaceous 

 matter occur in nearly all the sliales. The dip near the mine is to 

 the W.N.W. at about 45 deg. — GO deg., and the strike is approxi- 

 mately N. ^4 deg. E. 



