
A fire boss is a person employed at a mine or state certified official, responsible for examining a mine for dangers, particularly explosive, poisonous or suffocating gases. Usually the fire boss is the first person to enter a mine, to verify its safety, before a shift crew enters. It may also loosely refer to a foreman or shift manager. ==Origins...
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http://en.wikipedia.org/wiki/Fire_boss

a person who inspects a mine for the presence of noxious gases, dangerous roofs, and other hazards. Also calledCf. mine examiner.
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https://www.infoplease.com/dictionary/fire-boss
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