47 



Tait'a Gully, Armidale. — Eich ruby silver ore has been found Case 58. 

 here. 8601, a siliceous ore, assays 3 oz. gold and 666 oz. silver 

 per ton. It is an unattractive-looking ore, but witb a glass the 

 eharacteristic lustre o£ ruby silver can be detected. 



'Roc'kvale, Armidale. — Silver ore, more particularly the ruby 

 variety, and argentiferous arsenical pyrites, have been frequently 

 found here. The Euby Silver-mine is on payable ore. The 

 deposit differs from all other silver properties in New South 

 Wales, except Broken Hill, in the variety of silver minerals that 

 are found, viz., native silver, pyrargyrite, proustite, horn silver, 

 and stepJianite. 7740 shows native silver in its characteristic 

 thread-like form ; while 6587 contains it as spongy brown masses, 

 the value of which might be overlooked at first. 6339, shows a 

 black encrustation of silver chloride. Ihe ruby silver ore is 

 commonly the antimonial variety, pyrargyrite, two specimens of 

 which, 6225 and 6227, are shown here. A block of arsenical 

 pyrites, traversed by a vein of pyrargyrite, is exhibited in case 

 128 ; while 7691, in case 125, shows the same minerals well 

 crystallised. The arsenical ruby silver ore, proustite, appears to 

 occur in small quantities only. 6369, a black antimonial silver 

 ore, probably stephanite. 



6227, an average specimen of the silver-bearing arsenical 

 pyrites which constitutes the bulk of the ore. 



7693, altered granite, representing the country rock. 



Emmaville. — ^8795, Webb's Mine, illustrates the mode of 

 occurrence of silver ores in this district. The rock is a meta- 

 morphosed slate ; it is traversed by veins of quartz, calcite, 

 blende, and arsenical pyrites. 



Eahl-ore is not uncommon as an ore of silver in the Emmaville 

 district. 8238, Webb's Consols Mine, shows it in association 

 with galena. 2431 and others from the Little Plant Mine are 

 similar. 



Bolivia. — In addition to galena, blende, pyrites, and fahl-ore, 

 a sulphide of lead and antimony, the mineral jamesonite, occurs 



