CAEBONATE INCLINE. 421 



The fifth level south has only been driven about fifteen feet, being in 

 the limestone, which extends at least that distance above its floor. 



The sixth level south follows in its windings the contact of porphyry 

 and limestone, which here dips steeply to the east and thus defines the eastern 

 edge of the fold. The contact material consists of a thin streak of man- 

 ganiferous clay and Chinese talc. At 30 feet from the end of this drift is 

 an upraise on the right, 30 feet in height, following the almost perpendicular 

 surface of the limestone, from the top of which a prospecting drift has been 

 run out and is said to have been nearly connected with the drift on the 

 fourth level ; the drift beyond this point is in the body of the limestone. 



On the seventh level no drift has been run to the southward, the incline 

 being here entirely in porphyry. 



The south drift on the eighth level has a general southwest course and 

 is cut in a decomposed material which seems to result from the decomposi- 

 tion of the overlying porphyry and of the thin bed of quartzite which is fre- 

 quently found between the porphyry and the limestone. It is a reddish 

 clayey mass, having a gritty feel and containing fragments both of black 

 chert and of quartzite. Within about twenty feet of the point where the drift 

 forks the clay rises suddenly to the roof and the drift passes into a light- 

 blue decomposed limestone of the pulverulent type, so common in the dis- 

 trict, which crumbles between the fingers. The further continuations of 

 these drifts are entirely in a body of fine-grained limestone of earthy text- 

 ure, as distinguished from the crystalline, granular dolomite which is most 

 frequently found. In the left-hand drift is a stope one set high and in the 

 right-hand drift there is a large chamber from ten to fifteen feet in height 

 and breadth and some twenty or thirty feet long, from which limestone has 

 been quarried to be sold to the smelters as flux. 



The south drift on the ninth level follows in its curves the contact 

 between limestone and porphyry, having some black chert in the floor. 



Of the workings on the north of the Carbonate incline those on the 

 first and second levels are now mostly inaccessible. As well as can be 

 ascertained, a thin sheet of ore extended from the incline, somewhat inter- 

 mittently interrupted, as a rule, by limestone rising to the contact with the 

 porphyry, whether caused by simple undulations in the limestone itself or 



