Safety violations at the Upper Big Branch mine spiked in 2009. Federal regulators ordered miners out of portions of the mine for repeated serious violations at nearly 19 times the national rate.
"Why wasn't it made to shut down?" asked Gary Quarles, a miner who formerly worked in the Upper Big Branch mine and whose son Gary Wayne Quarles died in the accident.
Ten days after the explosion, Obama told federal officials that action was necessary to "tackle the backlog of cases" that allowed some companies "to evade their responsibilities" for safety by taking advantage of delays.
Officials of the Mine Safety and Health Administration said Upper Big Branch should have been flagged for shutdown well before the explosion. A preliminary report on the explosion suggests that a serious safety violation — failure to deal with combustible coal dust — may have contributed to the deadly blast.
Massey did not accept those findings. M. Shane Harvey, Massey's general counsel, said safety had been a company priority.
"We treat citations seriously and we are working diligently to constantly improve safety at our operations," Harvey said. "Massey has urged Congress to provide the resources to clean up the appeals backlog. The backlog does not benefit Massey or any other operator."
Nearly 300 citations issued at Upper Big Branch between January 2008 and the time of last year's explosion are still pending review by the appeals board.
GOP members of Congress argued that Miller's proposal was too sweeping, and premature. After all, they said, the official final report on the explosion had not yet been completed.
Industry lobbying against the bill was intense. The National Mining Assn. alone reported spending $3.2 million on lobbying last year, a portion of it to oppose Miller's bill. That effort was joined by hundreds of other companies and trade associations including the U.S. Chamber of Commerce. Overall, the mining industry made $6.4 million in political donations in the 2010 cycle, according to data provided by the nonpartisan Center for Responsive Politics, which developed a detailed history of mining industry lobbying and campaign expenditures in collaboration with The Los Angeles Times.
The industry coalition targeted vulnerable moderate Democrats in swing districts, warning them that the legislation could cost jobs.
Concerned about the fraying prospects, Miller removed sections of his bill governing construction workers and sand and gravel mines. But he insisted on including underground gold, copper and other hard-rock mineral mines after two workers died in an accident at a Nevada gold mine last August.
Nevada Democratic Reps. Shelly Berkley and Dina Titus were among those who had expressed support for Miller's effort — in part because it initially included provisions to protect construction workers — but ultimately voted against the amended bill.
Titus said in a recent interview that the legislation should have focused only on coal mining.
"If the bill was not as far-reaching, it would have had a better chance," she said.
Berkley did not respond to requests for comment.
Titus received $21,000 in campaign contributions from mining interests during the 2010 cycle, and Berkeley received $22,000.
Just before the House voted last December, the Chamber of Commerce designated the bill as a "key vote," a signal that it could be used to help determine which candidates to support or oppose in upcoming elections.
The bill failed to win the two-thirds majority necessary to pass in the House during the hectic lame-duck session.
The Obama administration's mine safety chief, Joseph Main, said that despite the legislative failure, his division launched its own surprise-inspection initiatives, issued unprecedented shutdown orders and obtained funds for increased personnel to help reduce the backlog at the Federal Mine Safety and Health Review Commission, which considers appeals from his division.
The agency issued 20 withdrawal orders at another Massey mine last month after a surprise inspection revealed conditions that "place miners at serious risk to the threat of fire, explosion and black lung."
While Main said he believed mines were safer today than they were a year ago, he acknowledged that his effort had had only a limited effect. In part that's because of the backlog: Increased enforcement produced more citations, which produced more appeals, contributing to longer delays.
Among family members of the dead miners, the inaction in Washington has brought a mixture of disappointment and despondency.
Last year's 48 mining deaths represented the highest fatality rate in coal mining since 1992.
"How many lives is it going to take before Congress realizes that these miners need more protection than what they've got?" asked Clay Mullins, a miner whose brother died inside the Upper Big Branch mine.
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Hamburger reported from Washington and Smith from Los Angeles.