Danger Mine Shaft Risk Sign. Shaft Mining Or Shaft Sinking Is Excavating A Vertical Tunnel From The Top Down, Where There Is Initially No Access To The Bottom

KEYWORDS

abandoned access attention australia australian background beware black bottom business caution coal commercial commodity danger dangerous dig economy environment excavating excavation finance fossicking geology hazard hole industrial industry information initially material metal mine mineral mineshaft mining notice old outback outdoors red risk safety shaft sign signage sinking site symbol top travel triangle tunnel underground vertical warning western white work