Federal impact inspections at U.S. mine operations in May resulted in 172 citations and 21 orders.
The Mine Safety and Health Administration conducted the inspections at 10 coal mines in West Virginia, Virginia, Ohio, Kentucky, Illinois and Utah.
Inspections also were done at two metal and nonmetal mines in Georgia and California.
The impact inspections began in 2010 after the Upper Big Branch mine explosion in West Virginia killed 29 coal miners.
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