84 T. S. Hart: The Mineralogicol (■haracters 



The next three groups are found in oi- near the granitic rocks. 



7. Molybdenite, usually with pyrite. — At Mclntyre's a quartz 

 reef contains these minerals. It is not noticed to be auriferous 

 except on the indirect evidence that the alluvial gold of some 

 gullies appears to start in its vicinity (14). This reef is 100 feet 

 from the ill-defined McEvoy's Reef, from which three masses 

 were obtained in close proximity to one another, and weighing 

 about 800oz. each. Another reef on Mt. Moliagul contains the 

 same two minerals, with the addition of arsenopyrite (14). It 

 may be noticed that arsenopyrite is known as an accessory in 

 the granite rocks at Morang. 



At the Mt. William goldfield in the Grampians the gold was 

 largely derived from the neighbourhood of one or more mineral- 

 ised bands in the gi'anodiorite. Part of the so-called alluvial was 

 simply decomposed granodiorite in situ, carrying tine gold. This 

 led to some remarkable views on the held as to the probable 

 course of supposed deep leads. On these mineralised bands the 

 quartz was in very thin veins for the most part, but at places 

 hollow swellings occurred, lined with quartz crystals of a some- 

 what amethystine colour. In the alluvial there were many 

 amethyst crystals and quartz crystals with marked zoned 

 structure. The miners stated that the distribution of the gold 

 was about that of the amethysts. 8oiiie of the claims woi'ked 

 decomposed seams in the granitic rock and were said to be 

 obtaining payable results. The mineralised bands contained, 

 with these small quartz veins and on joint plane without quartz, 

 molybdenite with a smaller quantity of pyrite, and in some 

 places chalcopyrite and pyrrhotite. Scheelite was also said to 

 occur, but I obtained no certain information on this point. 

 Though the undecomposed rock carrying these minerals was not 

 being worked there can be little doubt that a great part of the 

 gold at least was derived from such occurrences, as gold was 

 being obtained in seams in the partly weathered rock, in 

 thoroughly decomposed rock, and in alluvial, of which some of 

 the characteristic constituents were cleaily derived ■ from such 

 bands. 



8. Bismuth minerals. — These were noticed by Ulrich from 

 Kingower and elsewhere (1, 2). They occur also at Redbank 



