By Peter Willard
The existence of a reef near the mouth of the Amazon River threatens to derail Brazil's biggest bet to expand oil production.
Petrobras is halting a drillship's activity at the Amazon River mouth exploration block and will put it to work at other offshore sites in the country's southeast, the company said in an e-mailed statement.
Meanwhile, the company is appealing a decision earlier this month by Brazil's environmental agency Ibama to block drilling near the 9,500-square-kilometer reef.
Petrobras has been waiting for approval to use the platform since . . .
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