One of the miners was taken to a hospital with non-life-threatening injuries, while the other six were treated at the scene, Hecla Mining Co. spokeswoman Melanie Hennessey said.
The miners were working about 5,900 feet underground when they were injured about 7:40 p.m. by a rock burst, which is an explosion of rock caused by excessive pressure from the weight of the ground above. They were working in the Lucky Friday, one of the nation's deepest underground mines.
Initial reports indicated that the miners could be trapped, but that wasn't the case, Hennessey said.
"Everyone in the mine has been accounted for and the mine is currently closed," she said.
The federal Mine Safety and Health Administration will investigate the incident, which comes after two Lucky Friday miners died in separate instances at the mine this year.
A roof collapse in a tunnel more than a mile underground trapped a 53-year-old silver miner in April. Crews recovered Larry Marek's body nine days later.
Last month, miner Brandon Gray was buried in rubble after trying to dislodge a jammed rock bin. He died from his injuries two days later.
Shortly after Gray's death, Mine Safety and Health Administration regulators criticized Hecla for safety failures that led to Marek's death. The mine received four citations and faces nearly $1 million in penalties, the Spokesman-Review of Spokane, Wash., reported.
The incident happened more than a mile underground at the Lucky Friday Mine in Mullan, according to Melanie Hennessey, a company vice president. Twenty-five miners were in the area at the time, she said.
The injured miners were treated for non-life threatening injuries.
The Global InfoMine website describes a rock burst as "an explosive failure of rock which occurs when very high stress concentrations are induced around underground openings."
The Lucky Friday is a deep underground silver, lead, and zinc mine, according to its website.
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