B. Lewis (Benjamin Lewis) Rice.

Mysore: a gazetteer compiled for government (Volume 1) online

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a strongly-marked bed of jaspery haematite quartzite forming a distinct ridge.
This strip of schists is faulted against the gneiss along its eastern boundary
about half a mile to the east. The noithern extension of the schists crosses
the Shimsha and is lost sight of in the broken ground east of the river, but the
southern extension can be traced to the high ground north of Ankanhalli.

1 The strike of the schistose beds here lends considerably eastward, and they
appear to extend towards Kunigal, instead of running nearly due south down to
Nagamangala, as I had formerly assumed on imperfect information.


South of Ankanhalli the highly characteristic ha;matite band reappears and
forms a marked feature, continuing for several miles till almost abreast of
the Narasimhaswami pagoda hill. The western boundary of this band of
Dharvvars is in all probability also a faulted one, several hundred feet in
thickness of chloritic and hornblendic schists lying between the haematite
bed and the gneiss near Nalkundi, while to the north, where the haematite
bed crosses the Bangalore road {\h miles west of the Yediyur bridge), it
shows close up to the gneiss. The schistose rocks appear to spread out over
a considerable area eastward of the Narasimhaswami hills, and ma)' very
likely reach as far as the line of granite-gneiss hills east of the Shimsha. A
line of considerable hills, showing all the characteristics of the auriferous
series, is seen to stretch southward for many miles some little distance west
of Kunigal. These rocks, if really belonging to the auriferous series, repre-
sent the beds deflected eastward or south-eastward near Kadaba, and as such
are worth examination. The old workings on Honnebagi hill, near Chik-
nayakanhalli, lie a few yards down the eastern slope and just within the
boundary of the auriferous schist area, the crest of the ridge being formed
by gneiss on which rests the basement bed of the schist series, which is here
a quartzite. The old workings, which consist only of small shallow pits sur-
rounded by dumps, extend southward for nearly a mile along the watershed,
and at the south end of the area they occupy have followed some east and
west reefs across the boundary into the gneissic area. The reefs are white
and " hungry-looking," and the old miners seem to have found no great
encouragement, for they have made no extensive excavations. The principal
reef on Honnebagi hill runs N. i5°-20° W., but trends southward ; at the
south end of the ridge it is about 5 feet thick. Overlying the basement
quartzite on Honnebagi hill comes a series of schists, horneblendic, chloritic
and micaceous, which occupy the space up to the foot of the hills, where they
are overlaid by argillites and a great thickness of ha:niatitic schists, locally
very rich in iron, and giving rise to the formation of sub-aerial breccias
which assume a lateritic appearance from the action of percolating rain-
water. Quartz reefs of rather more promising appearance than those on
Honnebagi hill occur here and there in the schists, and are probably the
source of the gold obtained from the streams draining this tract. A set of
washings made l

Online LibraryB. Lewis (Benjamin Lewis) RiceMysore: a gazetteer compiled for government (Volume 1) → online text (page 8 of 98)