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Brazil Minerals discovers alluvial material with potential for diamonds

25 september 2018
Brazil Minerals has discovered alluvial material with a high probability for diamonds in over 57 percent of the holes drilled in one of its mineral rights north of the Minas Gerais state.
The mineral rights were located in the Jequitinhonha River Valley, which had been a well-known source of gem-quality alluvial diamonds for over two centuries.
The company said it had drilled 35 holes spaced 30 to 50 meters apart utilising a Banka 4-inch percussion rotary drill.
“Our identification of an initial diamond-rich zone within a gold mineralization area is a very good outcome,” said company chief executive Marc Fogassa.
“It is relevant to note that this particular mineral right has 1,310 acres and this drilling campaign covered only a small portion of such area.”
 All drill holes were previously found to be positive for fine gold and further inspection of collected samples indicated that there was a diamond-rich zone in the area as well.
Satellite markers for diamonds, such as limonite, rutilite and tourmalinite, among others, were observed in all samples recovered within this diamond-rich zone.
The Jequitinhonha River Valley had been a well-known source of gem-quality alluvial diamonds for over two centuries.

Mathew Nyaungwa, Editor in Chief of the African Bureau, Rough&Polished