By Alex MacDonald

LONDON--Anglo American PLC (AAL.LN) said Monday it will take an impairment charge of $0.3 billion after withdrawing from Pebble, a massive, environmentally-contentious Alaksan copper-and-gold venture, in favor of prioritizing high-value, low risk projects.

"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.

He said that Anglo is focused on prioritizing capital to projects with the highest value and lowest risks. He also said it wants to reduce the capital required to maintain projects in its pipeline. Anglo American said it expects to record a post-tax impairment charge of $0.3 billion this year as a result of its withdrawal from the project.

The globally-diversified miner, which owns Pebble in equal share with Canada-based Northern Dynasty Minerals Ltd. (NAK), had invested just over $500 million of the $1.5 billion it committed to in 2007.

The FTSE-100 company made the investment at a time when a near-decade long mining boom had pushed miners to look for new deposits in more remote areas of the world. However a recent downturn in prices for many commodities, including copper, have prompted many large miners such as Anglo and Glencore Xstrata PLC (GLEN.LN) to review their project pipeline with a view to cutting costs and prioritizing those projects that generate the most attractive returns the quickest.

Pebble, one of the world's largest undeveloped gold-and-copper deposits, has already faced several years of protests from activists who allege it could harm an important spawning habitat for wild sockeye salmon, as well as damage communities around Bristol Bay that depend on fishing.

Anglo and Northern Dynasty Minerals had countered by saying that the project would bring significant economic benefits to the region and could co-exist with Bristol Bay's fisheries without environmental harm. Anglo American had also previously said it would only go ahead with the project if it was environmentally sound.

A preliminary assessment detailed in a June presentation by Northern Dynasty showed that Pebble would cost about $4.7 billion to develop, with construction possibly starting in 2017 and commercial production starting in 2021. Pebble is expected to produce an average of 678 million pounds of copper and 673,000 troy ounces of gold over a 45-year lifespan, according to Northern Dynasty.

The initial estimate includes a plan to build an open pit mine, although no decision has been taken to go ahead with the project.

Rio Tinto, which holds about a 10% indirect stake in the project through its 19.8% holding in Northern Dynasty, had previously said it would only support Pebble if it were an underground mine, not open pit. Sam Walsh, Rio Tinto's new CEO, said in April that a "huge amount...needs to be done to prove or disapprove that the project can be built in a way to meet our standards."

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

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