ECONOMIC GEOLOGY. 195 



The manganese appears to be in a lower state of oxidation than 

 dioxide, and is probably in the form of Braunite ) or Hausrnannite. 

 The second locality occurs 2 miles south of Kannevihalli on the 

 western flank of a small spur extending north- 



of Krn g n a e n vlh e alIi eS0Uth ward fr0m the south-western apex of the curve 

 of the Kumaraswami section of the Sandur hills. 

 The ore which is much blacker in colour and of richer quality than 

 that occurring on the Narayan Devar Kerra ghat, is imbedded as 

 nodules in a greyish soft argillite which is greatly weathered on the 

 surface. The nodules are of all sizes, from that of a small nut up to 

 a child's head. They occur in large numbers, and could easily be 

 quarried along the bare side of the hill and shot down to the foot 

 of the spur whence to be carted on a tram and carried to the nearest 

 railway at very small cost. 



The ores are thus of fairly good quality, and will in all probability 

 be of considerable value ere many years have elapsed, especially if 

 iron making on a large scale should be started to utilize the haematites 

 which abound so greatly in Bellary District. The supply available is 

 considerable even without any deep mining. 



The two other localities yielding manganese ore occur some 7 and 

 8 miles, respectively, south-east of the Kannevi- 



Manganese ores on 



the south flank of halli spur. The manganese nodules are seen 



the Sandur hills. 1 1.,., 1 , ,, 



exposed on a narrow terrace a little below the 

 edge of the Kamaraswami plateau where crossed by the foot-paths 

 leading from Tonashagiri and Somahalli respectively to Kammatar- 

 nou (Combudhurroo) at the eastern end of the plateau, The sections 

 seen do not expose the rock sufficiently to show whether or not the 

 nodules are plentifully distributed through the matrix or only of rare 

 occurrence. If the latter is the case, these two localities would be of 

 no value as sources of the ore, and as it is the nodules of ore observed 

 were poorer in quality than in either the Raman drug or the Kannevi- 

 halli spur localities. 



If the maps (Atlas sheet SQ and i-inch Madras Survey) are to be 

 relied on all four of the manganese localities lie outside the boundary 

 N2 ( 195 ) 



