1026 
MANGANESE DEPOSITS OF INDIA : DESCRIPTIVE. [ PaRT IV : 
replaced two portions of the same beds of rock, although they were 
separated by an intervening break. The former alternative seems the 
more likely. 
Group II.— The Kannevihalli Deposits. 
The second locality noticed by Foote l :— 
' occurs 2 miles south of Kannevihalli on the western flank of a small spur 
extendint; northward from the south western apex of the cvirve cf the Kumara- 
swaini 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 ' 
This is probably not one of the deposits mapped by Mr. Ghose, for 
it is doubtful if anyone would consider such nodule deposits worth 
working under present conditions. It must be somewhere near the 
Iruku Kolla deposit in the Kumaraswami group. 
I did not visit any of the Kannevihalli deposits myself, except for 
a few outcrops I crossed on the way from Ramandrug to the mouth of 
the Narihalla. The occurrences T crossed were none of them of any 
value and were exposures of phyllites and fine-grained sandstone-like 
quartzites impregnated and partly replaced by manganese oxide. 
In the bed of the Narihalla leading through the Oblagandi gorge to 
Sandur there are to be seen many good expo- 
The Narihalla. i t_ . r r .^^ 
sures of rock ; but, as tar as i noticed, none were 
of manganese-ore. In the bed of the stream, a considerable proportion 
of the pebbles and boulders of every description of rock were coated with 
a shiny black glaze, which, at least in the one specimen I tested, seems 
to be due to manganese oxide. Many of the fragments when broken 
open were found to be manganese-impregnated and replaced rocks of 
various descriptions. Some of these specimens were very interesting, 
showing every stage in the metasomatic replacement of phyllites, slates, 
and fine-grained quartzites, by manganese oxide. Several of the 
partly-replaced specimens were beautifully variegated in various shades 
of white, brown, red, purplish, and black, due to different combinations 
of iron and manganese with the original colours of the rocks. 
1 Log cit., p. 195. 
