8 Proceedings of the Royal Society of Victoria. 



The lodes are only of moderate average thickness say, of 1 foot 

 and 1 foot 6 inches, but the contents are fairly rich, an average 

 of li ounce gold per ton has been obtained over a considerable 

 period of working. The lode filling therefore shows a high 

 grade of concentration. 



The lode track is full of small slickensides, that are interesting 

 when viewed in connection with the contorted schist of the 

 neighbourhood, and to the regular and solid rock mass adjacent 

 to it. 



Referring now generally to the facts recorded as to Bethanga, 

 Mount Elmo and Lightning Creek, it will be noticed that there 

 is a parallelism of the strike of the deposit to the ancient bedding 

 planes seen or inferred in each case, and, at the same time, the 

 deposit is not of the "contact" class. This same parallelism is a 

 marked feature of many of the deposits in the schists of the 

 Western Coast of Tasmania, only there the deposits are 

 prominently connected with metasomatic action, during which 

 action the element fluorine has often been present in so much 

 quantity as to bring about the production of minerals such as 

 axinite, datolite, fluorite and tourmaline, to such an extent as to 

 somewhat mask the original features. Tiie same feature of paral- 

 lelism is involved in the now generally accepted reading of the 

 Broken Hill occurrence, as being an extreme case of a saddle infor- 

 mation in schist, and, it is interesting in passing, to note that, at 

 the latter place, Mr. J. C. Moulden^, has recorded the presence of 

 cordierite but as a primary constituent of the rock. Although 

 the evidence, if not otherwise supported, would- not be in itself 

 strong, nevertheless, there is in it a considerable suggestion as to 

 similarity of origin. 



All the occurrences described in the paper have common features, 

 but these features differ greatly in degree. The crystalline rocks 

 or gneisses at Bethanga offer the extreme case of metamorphosis 

 just as do the gneissose masses at Ensay or the crystalline schists 

 at Broken Hill or in North Western Tasmania, and in addition 

 to this they exhibit extreme concentration of mineral in a narrow 

 lode track. The auriferous rocks at Mount Elmo exhibit both of 

 the same phenomena to a much smaller degree, whilst the occur- 



1 Jour. Rov. Soc. N.S.W. 



