Chap. XXIX.] 
SINGHBHUM DISTRICT. 
62i 
Chaibasa manganese to have been derived from micaceous hematites 
containing manganese, as in the case of the Jabalpur ores. And although 
I noticed no iron-ore, other than lateritic, near Chaibasa, yet such 
micaceous-hematite schists may exist in the neighbourhood — if not 
exposed, then concealed by alluvium or lateritic outcrops. It is 
interesting to note that such rock, identical in every lithological 
character with that of Jabalpur, has been found by Mr. C. .4ubert in 
the Dharwar area of Singhbhum at Hakigora Hill near Kalimati, about 
30 miles east-north-east of Chaibasa. l 
As these ores often occur on the tops of hillocks, it seems probable 
, ^ that they were formed before the present contours 
Time of fonn.ition ' 
of the ores. of the country were carved out, or perhaps during 
the process of weathering and denudation of the 
rocks to their present shape. 
Considering the above facts, it is not surprising that these ores are 
Commercial value ^^^J patchy and irregular in their mode of distri- 
of the deposits, and bution, and it is not to be expected that more than 
analyses of the ores. ^ thousand tons of manganese-ore will ever 
be collected from all the localities combined. 
The samples taken by me — which were analysed by Messrs. J. & H. S. 
Pattinson, and are inserted in the following pages in the accounts of the 
respective deposits — show the following range and average values for 
the various constituents : — 
Analyses of manganese-ores and manganiferous iron-ores from Singhhhum. 
Samples. 
Hand-specimens. 
KaturB of ores. 
Manganese-ores, 
Manganiferous iron-ores. 
Manganese-ores. 
Number of analyses. 
.3 
3 
3 
Limits. 
Mean. 
Limits. 
Mean. 
Limits. 
Mean. 
54-47 
0 18 
0-07 
0-31 
0-42 
Manganese . 
Iron .... 
Silica 
Phosphorus 
Moisture 
46-89— 48-08 
1- 22— 6-10 
2- 45— 8-30 
0-27— 0-42 
0-55— 0-80 
47-66 
2-90 
4-63 
0-34 
0-63 
4-23—20-66 
25-60—41-30 
14-70—18-10 
0- 35— 1-18 
1- 00— 1-40 
11-84 
34-97 
16-46 
0- 74 
1- 17 
50-66— 57-14 
0 05— 0-35 
0-05— 0-10 
0-29— 0-32 
0-35- 0-45 
1 Since I wrote this I have seen the deposits of Sandur and Mysore and I now think 
that, although the manganese may have been derived from micaceous hematite, yet the 
small amount of manganese probably present in the other Dharwar rocks, such as the 
phyllites, may have been sufficient for the purpose, after concentration by circulatirg 
waters. 
