Primarily an issue in coal mines, where carbon monoxide (which is also very toxic) and methane are released from the coal, so even a spark can be dangerous and cause catastrophic explosion.
There isn't the same acute risk in tin mines, However there is still a risk of fire if a carelessly sited candle sets light to rubbish or timber. There was a disaster in Snaefell lead mine on the Isle if Man where a fire caused bad air which overcame miners in the lower levels. The ventilation had been marginal in the first place and the toxic gases (carbon monoxide and low oxygen) could not safely dissipate even though the fire itself was not that big. You'd still happily use naked flames in a metal mine but (almost) never in a coal mine.
(Apparently a small minority of coal mines were classed as "naked light" mines due to good ventilation and very low concentrations of CO or methane from the coal)
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