Archean Group
Economic
- The Archean Group of rocks, of which Dharwar system forms a very important sub-group, are regarded as the most important economic-mineral-bearing groups of Indian stratigraphy.
- Baring Coal and Petroleum, most other economic minerals like those of Iron, Copper, Manganese, Lead, Zinc and Gold etc. have come from rocks which broadly belong to Archean time.
Manganese
- Almost the whole of manganese annually produced in India is derived from Archean rocks.
- The chief manganese bearing rocks are: Gondites developed in Balaghat, Bhandare, Chinddwar, Gangapur and Chhotta-Nagpur. These are typically sedimentary rocks that show prominent structure and are highly manganiferous.
- Kodurites, those are ....
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