CiiAP. XXXII.] 
UAf-AGUAT : PONIA. 
701 
arms of the belt, so that Thirori South Hill and the Janirapani outcrops 
form three sides of a quaquaversal. In Ponia and the Thircjri North- 
Hillocks, however, the dip is to the east side, indicating an overturn, 
'rhere is a very large quantity of merchantable ore in each of the 
three village area.s of Fonia, Thirori, and Jamraj)ani. The workable 
parts of the belt are the two hillocks of I'oiiia, the north end of Thirori 
Bast Hill, the whole length of the West Hill, the South Hill chiefly at 
its north end, and along the whole Jamrapani outcrop at intervals. 
There are apparently two ore-bands, which consist at the south-west 
, end of spessartite- quartz-rock ; but a little to tlie 
north-east, where the Government forest clearing 
crosses the outcrop, these bands give rise to two ore hillocks corresponding, 
apparently, one to each band. The hillock corresponding to the south- 
east band is dome-shaped and perhaps 80 feet high, and both it and 
the second hillock contain a large quantity of good hard grey ore, occasion- 
ally coarsely crystalline. The north-west band can be followed as a low 
ridge for about ^ a mile, good-quality ore being seen at intervals for nearly 
this whole length. These two bands may continue further to the north- 
east. A sample (No. 51) was taken along the outcrop of the north-west 
band and consisted entirely of the fine-grained hard grey braunite-psilome- 
lane mixture. It was analysed at the Imperial Institute with the result 
shown on page 704. This analysis shows a very high grade ore consisting 
of about 4-.3 per cent, braunite and 57 per cent, psilomelane. 
In the most northern of the Thirori hillocks the ore-band consists of 
Thirori North Hil- the speckled variety of manganese-ore, in some 
^0^^^- places of good quality ; while in the low hillock due 
east of Hirapur the ore-band consists of interbanded ore, quartzite, and 
spessartite-quartz-rock (gondite), with some intrusive quartz-felspar-rock 
containing a brown mineral (either spessartite or pyroxene) altered in 
places to manganese-ore. The second band, marked to the south-east 
of this band, is obscurely exposed. 
Two ore-bands traverse the length of this ridge in a north-north-east 
^, . . „ „ direction, the eastern one occupying the crest. 
Thuon W.'st Hill. r^,- 1 1 , ■ , ^ 
ihis band shows m one place a very steep westerly 
dip and consists throughout its whole length of merchantable ore, the 
speckled variety predominating at the southern end and the hard grey 
variety at the northern. The greatest outcrop width seen was 6 yards. 
The other band is about GO to 70 yards to the west of this and at a slightly 
