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Martin Marietta mine among 18 cited during MSHA monthly inspection in April
MSHA issues citations to seven metal/non-metal mines during impact inspections in March
MSHA issues citations to five metal/non-metal mines during impact inspections in February
Sand and gravel mine cited for 8th time
MSHA issues 43 citations during May impact inspections
MSHA issues 66 citations, 3 orders in February impact inspections
Louisiana revokes Explo Systems' explosives license for improper chemical storage