20 



WALKER : GEOLOGY OF KALAHANDI STATE, 



Mr. Foote as Dharwars, but as the hill was very small and I was not 

 sure of its geological relationships I have not colored it separately in. 

 the geological map which accompanies this report. Bands of good ore 

 alternate with bands of garnetiferous quartzite. I do not think thai 

 any large quantity of high grade ore could be obtained there. 



(m) —Manganese and Cobalt. 



Along with the iron ore at Olatura there occur some very mangani- 

 ferous varieties containing as high as 41-03% of metallic manganese 

 (specimen 15*227). Mammilary concretions probably best designated, 

 wad were found containing cobalt. A partial analysis of specimen, 

 15*226 gave the following result: — 



Insoluble in HC1 . 



Mn calculated to MnO. 



BaO 



Fe 2 3 



CoO 



Loss on ignition 



Constituents of the soluble portion not determined 



Total 



29*41% 



43*3o% 



4-5i% 



7**4% 



•82% 



1046/i 

 3-66% 



IOO'OO 



This cobaltiferous wad approaches the New Caledonian and 

 Australian asbolites in composition. The sample assayed is not rich 

 enough in cobalt oxide to be of any commercial value, but it would not 

 be surprising if an ore of such variable composition were locally 

 richer than these samples, and in that case be rich enough to be worth, 

 exploiting 



(w). — Mica. 



Occasional outcrops of mica bearing pegmatites were observed in 

 Tundla and surrounding villages, but I have not seen any muscovite in 

 -heels huge enough to cut into merchantable sizes. 



