By Patryk Wasilewski And Martin M. Sobczyk 

WARSAW--The Polish government said it would close four coal mines to stave off bankruptcy at Europe's largest coal producer, a plan that was met with labor-union protests on Thursday.

Several hundred miners stayed underground after their shifts on Thursday to protest the plan that would see four mines belonging to Kompania Weglowa SA in the south of Poland closed down and 10 bailed out by state-controlled companies. Kompania Weglowa is owned by the government and isn't publicly traded.

Coal-rich Poland, which uses the resource for almost all of its power generation, has for years struggled to put its mining sector on a solid footing. While Kompania Weglowa's woes have stretched over most of the past year, global coal prices have been hit hard recently by the rapid fall in the global price of oil. The low prices in global markets have meant imports are cheaper than domestically extracted coal, pushing Kompania Weglowa to the brink of bankruptcy.

The company posted a loss equivalent to about $110 million for January through November last year, and the loss it is taking on every metric ton of coal produced is around $18, government officials said this week.

A radical restructuring is the only alternative to a bankruptcy, Prime Minister Ewa Kopacz said on Tuesday. Kompania Weglowa is projected to post a loss of another $260 million through May even if it unloads four of its most troubled mines to a special entity that will liquidate them, the government said.

To prevent an uncontrolled failure of the company that has 49,000 employees, the government wants other companies to save the most promising coal mines, while some $630 million would be spent on severance packages over two years.

Coal trader Weglokoks and state-controlled power utilities are at the heart of the rescue plan for the 10 coal mines the government wants to save. Weglokoks, supervised directly by the government, will inject capital into a new company that will continue to operate the mines. Listed power companies will be given offers for injecting capital "on market terms," according to the government.

Poland's biggest power company, PGE Polska Grupa Energetyczna SA, as well as the second-largest utility, Tauron Polska Energia SA, declined to comment on the government proposal. Both are controlled by the Polish government.

A trade union operating in the coal industry said it would organize large-scale protests, including a general strike, if the government doesn't drop the plan. Trade unions at another coal miner, Jastrzebska Spolka Weglowa SA, refused to discuss measures aimed at cutting costs and benefits, the company said on Thursday.

Even with the worst-performing mines spun off, the new coal company taking over from Kompania Weglowa will be in dire need of restructuring and capital. The new owners will foot the bill and oversee the necessary changes, with most of the financial burden likely to go to coal trader Weglokoks and power utility PGE, said Artur Iwanski, director at PKO BP brokerage.

PGE and Tauron, the two state-controlled utilities in Warsaw's blue-chip WIG 20, were the only components of the index in the red on Thursday, with WIG 20 finishing the day 2.3% higher. PGE closed 0.2% lower and Tauron was 0.6% lower.

"For the utilities, the plan is slightly negative," Mr. Iwanski said, with the acquisition price being the key factor for the companies' future earnings.

The Polish government said it plans to rush the restructuring plan through parliament.

It also said it plans to consolidate the power generation sector into a bigger company that will include PGE and Tauron, as well as two other state-controlled companies Enea SA and Energa SA.

"The future of energy is competition on a European scale," said Treasury Minister Wojciech Karpinski, whose ministry supervises the companies. "Today, Polish energy firms are small compared with the largest European players. Our goal is to increase the role and weight of Polish electricity players in the European market."

Poland hopes the economies of scale will enable the new bigger venture to cut production costs, the government said. The four companies it plans to tie up together are a product of an earlier consolidation of regional power distributors.

Write to Patryk Wasilewski at patryk.wasilewski@wsj.com

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