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Molycorp Inc., the Greenwood Village-based owner of the largest rare-earth deposit outside China, said a proposed doubling in production would need as much as $200 million of extra investment, and it may pursue joint ventures to raise the cash.
Molycorp is considering raising the 2012 output target for its Mountain Pass mine in California to 40,000 tons from 20,000 tons. That would add $100 million to $200 million to the project’s estimated $531 million cost, chief executive Mark Smith said.



