For the second time in recent weeks, the Obama administration's environmental policies have clashed with its efforts to boost American jobs.

The U.S. Export-Import Bank, a federal body charged with promoting U.S. exports with loan guarantees, decided against backing a sale of coal-mining equipment to an Indian company. The guarantees were denied amid the agency's concerns about the mine's environmental impact.

Bucyrus International Inc. said it was likely to lose orders totaling as much as $600 million for mining machinery from a subsidiary of Reliance Power Ltd. of India because of a decision by the Ex-Im Bank against providing loan guarantees to help finance the purchase. The orders were contingent on obtaining the guarantees, which would cut the cost of financing for Reliance, part of a conglomerate headed by Anil Ambani.

A person familiar with the situation in India said Reliance has chosen not to purchase the mining equipment from Bucyrus because of the bank's decision.