(CNN) -- A rock burst at a mine in northern Idaho Wednesday evening injured seven miners, a company spokeswoman said.
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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