Black Mountain Mining Company · Tipo de accidente, sin lesiones
ROOF FALL OCCUR9ED IN CROSSCUT BETWEEN NO 3 & NO 2 ENTRIES AT ABOUT 70FT INBY STATION NO 63 FALL MEASURED APPROX 17FT WIDE X20FT LONGX6FT HIGH IT CONSISTED OF UNCONSOLIDAT ED SOAP STONE & SHAL E THIS AREA WAS3SUPPORTED WITH 5FTX(IN CROSSBARS & LEGS ON 3-31/2 CENTERS ALSO 5FT RESIN BOLTS 2IN EACH BAR & SPOKE & BETGWEEN BARS