THE LODES. 



*3 



South of the Mysore Mine the Champion lode is ill-defined and 

 broken, and although considerable prospecting work has been done 

 by the Kempinkote, Mysore Reefs and Yerrakonda Companies to 

 locate a payable section on the southern extension of the lode, no 

 favourable discoveries have as yet resulted. 



An interesting feature of the mines are the folds along the axes 

 of which particularly large and valuable bodies of ore are found. 

 In these folds the vein is doubled back on itself, the axis of the fold 

 having a northerly dip in the plane of the. vein. This may be illustra- 

 ted by making a fold or pleat diagonally across a rectangular sheet of 

 paper. If the paper be held with the edge horizontal and directed 

 north and south to represent the outcrop of the vein and the plane 

 of the paper be inclined at a steep angle to the west to represent the 

 " underlie - " of the lode, the pleat running from the top south corner 

 to the bottom north corner of the paper will very faithfully represent 

 the course of the folds in the vein. (See figure i.) 



Fig. i. — Diagram illustrating the formation of folds. 

 The folds are well developed in the Mysore, Champion Reef 

 and Nundydroog Mines: and, on account of the thick masses of 

 quartz developed along the top and bottom angles of the folds, have 

 given rise to valuable reserves of ore, the stopes on these portions 

 being occasionally of great width, e.g., as much as 33 feet on the 

 eastern limb in the Champion Reef. It is a fortunate circumstance 

 that the ore stoped from these places is generally of exceptionally 

 good grade. The cross-sections drawn to scale of the Champion 

 Reef and Nundydroog Mines will illustrate the nature of the folds 

 (see Pis. 12 and 13). In connection with the folding there is often 

 a branch split off from the main lode which encloses a large horse 



