By Alex MacDonald And Scott Patterson 

Anglo American PLC said Thursday that it would shave up to $4 billion off the value of its mining assets, in another sign of the U.K. resources giant's struggle to execute a turnaround plan launched by Chief Executive Mark Cutifani.

Most of the write-down will come from the Minas-Rio project in Brazil, a person familiar with the matter said, an $8.8 billion bet on iron ore launched last year as prices for the steelmaking ingredient spiraled toward historic lows. The company cited weak, volatile prices for iron ore and metallurgical coal for the post-tax, noncash impairment charges.

The write-off comes about a week before Anglo is due to release financial results for the first half of 2015 that analysts expect to be weaker than last year, when it posted a net profit of $1.46 billion. Mr. Cutifani is likely to face pointed questions next Friday about the storied miner's long and painful fall from grace that has accelerated since he took over in April 2013.

"We will certainly engage [management] on the company's poor performance and their proposed turnaround strategy," said Sekgoela Sekgoela, a spokesman for Anglo's largest shareholder, South Africa's Public Investment Corp., the country's state-owned investment fund.

Mr. Cutifani had gained a reputation as a turnaround expert in his five years leading AngloGold Ashanti Ltd., a company that Anglo American created in 1998, began selling out of in 2006 and completely exited in 2009.

Investors had looked to the 57-year-old to fix things when he took over what the British press has long called "the toughest job in mining" because of the company's sprawling empire and its large operations in South Africa, whose government happens to be its largest shareholder.

Mr. Cutifani's job was made even more difficult by a commodities price slide that has smacked the entire industry. From copper to nickel to coal, prices have fallen sharply in the past year, hurt by a slowdown in Chinese demand. Top competitors like BHP Billiton Ltd., Rio Tinto PLC, and Glencore PLC have also taken large write-downs and watched their share prices dive.

But none of the big, independent miners has been hit quite as hard as Anglo. Halfway into Mr. Cutifani's three-year turnaround plan, the company hasn't been successful by its CEO's own measures.

Mr. Cutifani said he would turbocharge profit by boosting the operational efficiency of its mines and cutting costs. Instead, profit has declined as commodity prices collapsed. He said he would shed poor-performing assets, such as the miner's struggling South African platinum mines, but he has struggled to strike any major deals.

The company has lost $16.5 billion in market value since he took over--a 46% drop--continuing a slide that began years before. Its London-listed shares are hovering near a 13-year low.

Now, investors and analysts are predicting that Anglo's cash flow will be so crimped that it may have to cut its dividend--a drastic move in an industry where shareholders have been clamoring for long-term investment yields.

"Management has little choice but to focus on balance sheet preservation in order to navigate a sustained downturn," said Marc Elliott, mining analyst at Investec Securities.

Anglo declined an interview request for Mr. Cutifani, who has remained upbeat in past public statements. He has said he has been successful in making several of Anglo's mines more efficient, reducing headcount and cutting operating costs.

"We are exactly half way through a three-year turnaround program that is fundamentally repositioning Anglo American--operationally, structurally and culturally--with progress on all fronts despite the sharply weaker price environment," said James Wyatt-Tilby, spokesman for Anglo American.

Mr. Cutifani's critics acknowledge he inherited a host of problems following six years of underperformance during the tenure of his predecessor, Cynthia Carroll. Among the biggest: overspending at Minas-Rio.

Anglo American acquired Minas-Rio in 2007 to capitalize on China's once-insatiable demand for iron ore. But the project fell more than five years behind schedule and costs ballooned to $8.8 billion from an initial $2.7 billion estimate, prompting the company to write down the value of the project on two separate occasions--to the tune of $7.5 billion after iron-ore prices fell.

The company started shipping iron ore from Minas-Rio in October, but Barclays says the mine may be running at a loss. Its break-even price for iron ore was $63.50 a metric ton during the ramp-up phase and $50 a ton at normal production, according to the bank. The comparable spot price was $50 a ton on Thursday. Meanwhile, competitors like BHP and Rio are producing a glut of iron ore at a lower cost, further hurting prices.

Mr. Cutifani, who can't do much more about Minas-Rio, has had limited success containing the fallout from that and other problems.

He has also struggled to reduce head count quickly in part due to tricky labor relations in South Africa, where it had to step back from proposed job cuts at Anglo Platinum, its majority-owned unit, following government-brokered negotiations with unions. Anglo is one of the largest employers in a country where unemployment is at an 11-year high of 26%.

The company got some good news with the closure of the Holcim SA and Lafarge Ltd. merger. That would help Anglo unload a construction venture with Lafarge that the miner wants out of and net the company $1.37 billion, possibly staving off concerns about its dividend.

Some experts say Mr. Cutifani remains the best-qualified person to shepherd the company's turnaround.

"I can't pinpoint anything bad that he has done apart from being overly ambitious," said Ben Davis of Liberum Capital, a London broker. "Also, who else would want the job in the current market environment?"

Write to Alex MacDonald at alex.macdonald@wsj.com and Scott Patterson at scott.patterson@wsj.com

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