2014 Preshift Contest Exam Questions taken from the 2014 Ohio Valley Mine Rescue Contest, Moundsville, WV Progress Indicator: Question 1 of 10 1.  Each underground coal mine operator shall ensure that at least 2 miners in each working section on each production shift are proficient in the use of all fire __________ equipment available on such working section, and know the location of such fire __________ equipment. Choices: retardant, suppression combative, fighting suppression, suppression