Chap. XIX.] 
MANGANESE IN LATERITE. 
385 
spread over many square miles of country, has thus, although from 
its position low-level, probably been formed, at least in part, by 
replacement of the underlying rocks accompanied by the usual segre- 
gative changes. From this we see that this low-level laterite is of the 
same origin as the rock I have called lateritoid. 
In the following list I classify the occurrences of manganese-ore 
List of ocouirences of found in association with lateritic rocks :— 
la tontic in iiiganese -ores. 
Table 23. 
Classification of the deposits of lateritic manganese-ores. 
I. — In low-level laterite : — - 
1. Goa. 
2. Chengalput. 
II. — In high-level laterite : — 
(a) On the Deccan Trap : — 
1. Bidar. 
2. Bijapur (Ingleswara),. 
(6) On the Dharwars : — 
1. Talevadi in Belgaum. 
III. — In lateritoid (always on the Dharwars j : — 
1. Bengal : — Singhbhum. 
2. Bombay : — Dharwar, North Kanaia. 
3. Central Provinces : — Jabalpur. 
4. Goa. 
5. Madras : — Bellary, Sandur. 
6. Mysore : — Chiialdrug, Kadur, Shimoga, TtimJcur. 
IV. — In lateritic soil resting on the Deccan Trap : — 
] . Satara. " 
V. — Exact mode of occurrence unknown : — = 
1. Morbhanj. 
The Talevadi occurrence should really be classified with the lateritoid. 
The Satara occurrences are noticed under the heading of ' Deccan 
Trap ' (page 369). All the occurrences of manganese-ore in lateritoid 
noticed above have been made the object of prospecting operations. 
In all these areas the work has revealed the presence of deposits that 
Economic value of the are of value when the price of manganese is 
^'-"P"^'*^- as high as it was in 1906 and 1907 ; but 
under ordinary circumstances most of these deposits are of too irregu- 
lar occurrence and too low grade to be of much value, unless a 
demand for manganiferous iron-ores can be found at the same time. 
II I. 
