CiiAr. XXXVI.] 
NAGPIIR, : KODEGAON. 
849 
1 907 it had been lengthened to 300 feet, and liad reac.lied a niaxiiniini 
deptli of 25 to 30 feet.] The bottom of tlie quarry "was very uneven 
because tlie best ore had been extracted leaving the inferior portions 
standing up in irregular n.asses. This deposit is much inferior to that 
of mine 1 , as it contains many patches and bands of quartz, dark grey 
({uartzite, spessartite-quartz-rock and some magnetite-spessartite-quartz- 
rock. The ore is the same mixture of braunite and psilomelane with 
exactly the same physical characters as in the other qiiarry. But it is 
sometimes more (;oarsely crystalline ; a fine crystal of braunite from this 
quarry was presented to the Geological Museum by the late Mr. A. M. Gow 
Smith (see page 60). In addition to this ore there is also a very jointed 
variety which is found in the lower parts of the pit, suggesting that the 
quality is deteriorating in depth : for it will be seen from analysis 5 below 
that this type of ore is distinctly inferior to that represented by analysis 4, 
In December 1907 a large mass of decomposed, and presumably intrurive, 
granitic rock was exposed about the middle of the ore-body. 
By November 1903, 6,500 tons had been quarried from mine ] and 
Nature and quality ^>500 from mine 2, and of thie 3,000 and 4,000 tons 
of the ores. respectively were still lying at the mine in stacks. 
The material in the stacks was very well cleaned, though there was often 
a little adherent clay, especially on the ore found as loose debris on top 
of the ore in situ. A sample taken by me from all the stacks of both 
quarries gave the following result on analysis at the Imperial Institute, 
London : — 
Sample No. 1. 
Manganese peroxide (Mn02) ..... ... 57 '05 
Manganese protoxide (AInO) . ....... 21 ".35 
Ferric oxide (Fe203) 10 -86 
Alumina (A1203) 2-34 
Baryta (BaO) O'OO 
Lime{CaO) 1-33 
Magnesia (MgO) 0-28 
iSilica (combined) 7 o (-v . ...... 3 '91 
Silica (free) > '^'^^ Q.^r. 
Phosphoric oxide (P2O5) 0-23 
Arsenic oxide (AS2O5) ......... O'Oll 
Water (combined) ......... 1 '65 
Moisture at lOO'C 0-28 
Carbon dioxide ! . .0-22 
99-681 
This is equivalent to : — 
Manganese ........... 52 '54 
Iron 7 -60 
Silica 4-08 
Phosphorus . . . . . . . . . . . O'lO 
Moisture 0 "28 
