35 



9238, pyrites after partial pickling in acid- Mucli of the Case 52, 

 pyrites has been dissolved, leaving the contttmea goiu as a 

 residual spongy mass. 



9242, rich pyrites in which gold is not visible. The analysis 

 shows that much calcite is present. The assay value of the ore 

 is 154 oz., the bullion being very pure ("987 per cent, of fine gold) 

 and worth 83s. lO^d. an ounce. 



9232, 9226, magnetic pyrites. This is generally barren. 



A very fine specimen of native antimony in calcite from this 

 mine will be found in case 68. 



9233, crystallised native antimony with calcite, showing gold. 

 Assay value up to 27 oz. per ton, the bullion being very pure 

 and worth 83s. per ounce. 



9229, antimonite with calcite, assaying 6'61 oz. of gold to 

 the ton. 



Orange, Opliir. — 8610, "Weir's Consolidated Mine, Caloola. 

 This is another instance of gold being contained by an igneous 

 rock. The rock is a quartz-porphyry that has been crushed under 

 the influence of pressure within the earth's crust ; it is sometimes 

 known as porpliyroid. The ore from Bushy Hill, Cooma, is of 

 this character (case 57, p. 41). 



7409 and 7410, Caloola CreeJc : The country rock here is 

 mica-schist,* which itself sometimes shows visible gold (7409). 



Mill End, Cowra, Wellington, MitchelVs Creeh, Stuart Town. — 

 An examination of the specimens from these divisions indicates 

 slate to be the country-rock, while the gold is contained essentially 

 in the quartz lodes that traverse it. 



4557, Lower Pyramul : free gold and gypsum in arsenical 

 pyrites.f 



2472, Eaglehawk, Windeyer : shows gold seated on blende. J 



2187, Salvation Hill, Gulgong : an instance of hard felsite 

 carrying gold. 



* It is conceivable that this mica-sohist may represent an intensely altered form of 8610. 

 t For other occurrences of gypsum with gold, see pages 27, 32. 

 % For other occurrences of gold on blende, see pages 27, 30, 35. 



