JUNEAU, Alaska (AP) — A Canadian company that was courted as a potential partner in a proposed copper-and-gold mine near one of the world's largest salmon fisheries in Alaska has backed away from the project.

Northern Dynasty Minerals Ltd., which is seeking to develop the Pebble Mine project in southwest Alaska, said Friday that it was unable to finalize an agreement with First Quantum Minerals Ltd., the potential investor.

It was not immediately clear what that means for the project, which has a permit application pending with the U.S. Army Corps of Engineers. Neither company offered immediate comment.

When the two companies announced talks in December, Philip Pascall, chairman and CEO of First Quantum Minerals, said in a release that the Pebble project is widely seen as "one of the outstanding unmined copper projects in the world."

He said his company was "very aware of the environmental and social sensitivity of this project."

Critics of the project, which is located in Alaska's Bristol Bay region, hailed news of the fizzled deal. Bristol Bay produces about half of the world's sockeye salmon.

Joel Reynolds, Western director of the Natural Resources Defense Council, said in a statement that First Quantum Minerals did the right thing.

"We hope First Quantum's decision closes the door, once and for all, on this ill-conceived and uniquely reckless scheme," Reynolds said.

Northern Dynasty had been looking for a new partner since Anglo American PLC announced it was pulling out in 2013.

Northern Dynasty owns the Pebble Limited Partnership, which last year settled a long-running lawsuit with the U.S. Environmental Protection Agency that cleared the way for the company to seek permits for the mine project.

But the EPA has left open the possibility for future restrictions on development.

Tom Collier, CEO of the Pebble partnership, earlier this year said the company will demonstrate that it can "successfully operate a mine without compromising the fish and water resources around the project."