Rep. Darrell Issa (R-Calif.), chairman of the House Committee on Oversight and Government Reform, has threatened subpoenaing the Environmental Protection Agency (EPA) for documents regarding a potential Alaska mine.

Issa, along with Rep. Jim Jordan (R-Ohio), said he wants to know more about the intentions behind a water impact test EPA is conducting near a discussed mine site in Bristol Bay, Alaska.

The lawmakers said in a Thursday letter that EPA’s actions have “bordered on the absurd” by since the committee’s initial May 10 inquiry about the matter.

“It strains credibility that EPA has been unable to provide a full response to the Committee more than seven months after the initial request,” Issa and Jordan wrote to EPA Administrator Lisa Jackson.

“If EPA fails to provide the documents as requested, the Committee will consider use of the compulsory process.”

At issue is the proposed Pebble mine, which developers say could produce sizable amounts of copper, gold and molybdenum, which is used in alloys.

Native tribes, commercial fishermen and some Alaska state lawmakers are concerned the mine would harm Bristol Bay’s sockeye salmon population, which accounts for 46 percent of the world’s supply.