JHird,
If you read up on Groote you will see that the deposition is Lower Cretaceous in age. Not Proterozoic. There is a massive age difference.
Only the besement rocks are Proterzoic, the cretaceous sediments unconfomably overlie.
The deposit wasn't upgraded. It was deposited insitu as a stratiform consisting of concentric manganese pisolites by microbial activity precipitating the Mn. Fossil evidence is still intact.
Geologically speaking these deposits are chalk and cheese.
JHird,If you read up on Groote you will see that the deposition...
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