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Saturday's small earthquake was not caused by and did not affect mining operations at Twentymile Mine, according to mine owner Peabody Energy and the federal agency that overseas mine safety.

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Twentymile Mine unaffected by Saturday earthquake

Mild temblor detected 12 miles southwest of Steamboat

The last time the U.S. Geological Survey reported a small earthquake in the vicinity of Twentymile Mine on March 30, the cause of the seismic activity proved to be the settling of a column of coal supporting the ceiling of a mine shaft. That was not the case this time, according to mine owner Peabody Energy.

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