Canada-based Northern Dynasty Minerals Ltd. (NAK, NDM.T) plans to begin the permitting application process for its $4.7 billion Alaskan copper and gold project by the end of this year even after its major project partner, Anglo American PLC (AAL.LN), suddenly withdrew from the project, Northern Dynasty's chief executive said Monday.

"Everything will be under review by NDM," Ron Thiessen, Northern Dynasty's CEO, told The Wall Street Journal in a telephone interview. However, he noted that "not too much work is left on the project other than to go to permitting."

Anglo American Monday said it has taken an impairment charge of $0.3 billion after withdrawing from Pebble, a massive, environmentally challenging Alaskan copper-and-gold venture, in favor of prioritizing high-value, low-risk projects. Anglo American's CEO Mark Cutifani, who had this summer vowed to pare back Anglo American's $17 billion of projects, said Pebble would now proceed under the sole ownership of Northern Dynasty.

Mr. Thiessen said Anglo American informed Northern Dynasty on Friday about its decision to pull out of the partnership. He added that Northern Dynasty would now review its project plan but effectively wouldn't have to compensate Anglo American for the amount Anglo had invested to date because Anglo didn't invest above an undisclosed threshold. Anglo American had invested $540 million out of the $1.5 billion it committed to spend on the project as of the end of June, Mr. Thiessen said.

He added that Anglo American's decision to withdraw was due to the FTSE-100 miner's decision to reprioritize its project pipeline rather than any concern about the project.

"Despite our belief that Pebble is a deposit of rare magnitude and quality, we have taken the decision to withdraw following a thorough assessment of Anglo American's extensive pipeline of long-dated project options," said Mark Cutifani, who took over as CEO of Anglo American in April.

"We wish the project well through its forthcoming permitting process and express our thanks to all those who have supported Pebble and who recognise the opportunities and benefits that such an investment may bring to Alaska," said Mr. Cutifani in a statement.

Anglo American and Northern Dynasty will embark upon a 60-day process to unwind their partnership, Mr. Thiessen said.

Write to Alex MacDonald at alex.macdonald@wsj.com

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