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In page Centralia mine fire:

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The Department of Mines and Mineral Industries (DMMI), who originally believed Bridy would need only to excavate 24,000 cu yd (18,000 m3) of earth,[2] informed them that they were forbidden from doing any exploratory drilling in order to find the perimeter of the fire or how deep it was, and that they were to strictly follow plans drawn up by the engineers who did not believe that the fire was particularly large or active. Instead, the size and location of the fire was estimated based on the amount of steam issuing from the landfill rock.[citation needed]