110 



E. 0. Teale 



Mount Tara Gold field. — It is in the northern half of this Ordo- 

 rician area, extending over a distance of about four miles, that 

 the noAv abandoned Tara goldfield isi situated (24 and 25). Nume- 

 rous old prospecting shafts and open trenches occur at intervals 

 thiroughout the field, but most Avork has been done at the northern 

 end, in the vicinity of Lady Ibrr Creek, where there are a number 

 • of adits and shafts. 



All the accessil)le adits wtre examined, and roughly sectioned. 

 These observations, together with those above ground, show clearly 

 that the rocks are very much disturbed, faulted and sheared. The 

 line of crushing and'^ shearing lies between N. and S. and N.N.E., 

 and coincides roughly with that oif the old mines. Though some 

 quartz occurs, it does not appear to be in the form of a defined 

 quartz reef, and the lode formation seems to be of the type of a 

 fracture zone of crushed rock with some quartz and gossany mate- 

 rial. 



The strike of the rocks is generally X. to N.E., but at the north- 

 ern end of the field there is much variation, north-westerly and 

 even westerly strikes being observed close to the normal direction. 

 This is well shown in some of the adits, where numerous faults with 

 a generally northerly trend are revealed. Most mining appears 

 to have been done at the " Orbost Tunnel " (Au. No. 9 on Map 4), 

 where there are two adits and some stoping has been done along a 

 fault line, striking 10 degrees east of north and dipping W.X.W. 

 at about 65 degrees. 



The auriferous occurrences are in general confined to the Ordo- 

 •vician belt, but gold has also been obtained in the porphyry, about 

 half a mile to the north of the termination O'f the Ordovician. This 

 was at the " Tara Crown," (Au. No. 2 (ui Map 4), where it was 

 associated with galena. This is probably a continuation of the 

 "fracture zone, which intersects the Ordovician. 



U ORDOVICIAN 



Mill rn a tin a thin htih of 

 sandslone and shale . 

 ■ S/rike /o'Dipcirso'h^ 



LOWER DEVONIAN 



fish heds , well hedged wifh dlternafintj coarse ^nd fine itc/s 

 di/Ji3nd strike simiL^r fo 

 U. Ordnv hi/t i/nronfnrmrible. 



SECTION c. Boggy Creek 



