The approvals will allow the company to modify its original expansion plan, already permitted and now 44 pct complete, which seeks to add another mine level.
The world's largest mining and construction equipment maker beat market expectations for fourth quarter earnings and said its sales growth momentum is expected to continue in 2018.
DRC's proposed mining code, which industry has warned will stifle investment in the copper and cobalt-rich nation, sailed through Senate without opposition.
Global zinc stocks falling to "critically low levels" by second half of 2018, propelling prices above $4,000 a tonne predicts Wood Mackenzie in new research.
