48 



Case 58. in some of the silver ores from this district. 8334, Pje's Creek, 

 a galena ore assaying 43 oz. of silver per ton, shows jamesonite 

 as a grey fibrous mineral, gradually eating into the galena ; the 

 former mineral apparently resulting from the alteration of the 

 latter, sulphide of antimony being super-added to and combining 

 with the sulphide of galena previously there ; the ore contains 

 more than seven per cent, of antimony. 



]2ora Greek (Howell), Inverell. — Galena and mispickel with 

 quartz and chlorite. The occurrence of massive stannite (tin 

 pyrites) in the Borah Creek ore is a specially interesting feature: 

 good specimens of the stannite will be found in case 66. 



Brahe. — The silver ores from this district are noteworthy, 

 both from the difficulty of treatment and from their mode of 

 occurrence. They consist in general of sulphides, among which 

 the undesirable zinc blende is sometimes conspicuous. jN^ative 

 silver occurs occasionally — 5208, 6371, 9102, from White Eock — 

 and arsenical ruby silver, proustite, has been found in small 

 quantities at Eivertree (2334). Silver sulphide, argentite, can 

 be seen in quartz from the recently discovered Kelly's Lode 

 (9101). 9100 shows the globule of silver resulting when ores 

 such as 9101 are roasted. The well-known White Eock Mine 

 is represented here by a number of specimens ; while in case 138 

 is a block showing quartz alternating with bands of pyrites, 

 galena, and blende. The country-rock, 6972, appears to be 

 porphyry ; while the ore-body itself is a breccia, consisting of 

 irregular masses of a volcanic rock (rhyolite) cemented together 

 by mineral matter. This is well shown by 8313. The ore from 

 Wann's Lode is very similar : it contains selenite (8783). 



At the end of this case will be found specimens of silver ores 

 from Boorook. The oxidised ore was very rich, but the deposits 

 have not been worked below water-level. 



Barrier Broken Hill. — The collection of specimens from the Broken 



Kange. jjj|j Silver-field is, perhaps, the best outside Broken Hill. In 



addition to this case, which is entirely devoted to Broken Hill 



silver ores, a special collection, presented by Mr. "Watkins, is 



