6 Proceedings of the Royal Society of Victoria. 



The ore occurrence an Bethanga is one of very great interest 

 in itself and was that to which most attention was paid for the 

 purposes of the paper. The mines at Bethanga are upon several 

 parallel lines of lode that have a general direction of 30 degrees 

 east of north. One of these main lines and some subsidiary ones 

 traverse the length of Mount Talgarno for nearly a mile, this por- 

 tion of the mine the author could only examine on the surface. 



At a point about half a mile to the eastward of the southern 

 end of the first lode, there is a second one known as Conness' 

 that continues southward past a bifurcation that occurs, and 

 until it reaches a fault line running nearly east and west and 

 which throws it about five chains eastward. Its continuation 

 southward of the fault forms the Gift mine for a distance of 

 about three thousand feet, but three hundred feet of this nearest 

 to the fault is not yet opened. This mine has three shafts, the 

 " Gift," "Martin's" and " Leighton's," in the order named, going 

 southward, of which Martin's and Leighton's are the deepest, 

 owing to the slope of the ground. Martin's shaft is 800 feet deep. 



A third lode also, broken by the fault, lies about half a mile to 

 the eastward of the Conness and Gift line — this lode has the 

 Welcome mine in its northern end and the Excelsior mine in its 

 southern portions respectively. 



A careful inspection of the surface showed that these lodes 

 were each in similar rocks typical of the district and this 

 enabled the author to concentrate his attention on the Gift 

 and Leighton mine where most work is in progress at the 

 present time, and where an exposure 800 feet from the surface 

 can be seen. 



The whole of the district around the mine is of schistose and 

 gneissic rocks, passing from manifest biotite and other schists, 

 characterized by much contortion, into a holocrystalline rock or 

 gneiss with the characteristic structure often resembling an 

 intrusive one in the field, but which proves on slicing to be of 

 oligoclase, biotite mica, very pale brown liornblende, some quartz 

 showing much strain structure, garnets surrounded by chlorite 

 and with very beautiful fibrolite, and small idiomorphic cordi- 

 erite^ — two typical slices are shown in Figures No. 1 and No. 2. 



1 Cordierite has recently been recorded as occurring at Wood's Point by F. P. Mennell 

 — Geolog. Mag., Sept. 1902. 



