Chap. XLT.] 
SHiMOOA : KUMSI. 
1137 
on the assumption that only ono-thinl of tlic ore wouhl he found up to the 
grade at present being shippech and that tlie average specific gravity of 
the ore is 4. A depth of 50 feet woukl therefore give 250,000 tons of ore. 
As about U)0,000 tons of ore had already been extracted by September 
1907, 1 think that the foregoing figure may be too pessimistic, owing per- 
haps to a larger proportion of the ore than one-third being despatched. 
Perhaps 300,000 tons of ore may be given as the probable maximum 
output of this deposit down to 50 feet, with a bare possibility of 500,000 
tons. Of course, should the deposit be found to continue productive 
to a greater depth, the foregoing figures would have to be increased. 
This deposit is the only one in the whole of Mysore, of those I exa- 
mined, that showed indications of any large quantity of ore. 
The ores of this deposit, as noticed on page 1130, are largely psilo- 
melane with wad. The ore as seen in the sun 
th^oI-eT ^"^^'^y of i^^g^ when composed largely or entirely of psilo- 
melane, a beautiful light blue colour, which is 
of course light grey in the shade. It often contains veinlets and patches 
of the bright crystalline mineral noticed on page 1131. At the eastern 
end of the deposit there is a considerable amount of soft pyrolusite, 
associated with decomposed quartzite and yellow ochre. There is also 
a considerable amount of yellow ochre associated with the psilomelanic 
ores. On the northern side of the deposit tliere is a large quantity of 
the oolitic ore noticed on page 1131. 
As regards quality, the ores of this deposit are very variable, owing 
to the replacement of manganese by iron. The best ore could possibly 
be selected to run over 50 per cent., but the majority of the ore as shipped 
runs between 45 and 50 per cent. Mn (see page 1132). The deposit 
also yields a considerable quantity of ore of lower grade than this, prob- 
ably ranging down to 35 per cent. Mn ; but such ore is not at present 
made use of. 
In addition to the analytical figures given on page 1132, 1 give below 
11 analyses by Mr. Fawcitt of selected specimens of the Kumsi ores ; 
their physical characters are given in the note to the analyses. The pho- 
phorus w^as not determined, but according to Mr. Fawcitt can be taken 
as averaging 0'05. The chief features of these analyses are the very 
variable proportions of manganese and iron in specimens all of which 
look like manganese-ore. The iron, it will be seen, tends to be lowest in 
the pyrolusites, fairly high in the wads, and highest in the pisolitic or 
oolitic psilomelanes, in which there is also an exceptionally large amount 
