Underburdened

Tasks may be taken from the overburdened and given to the underburdened; certain tasks may be shared; some additional (new) tasks may be assigned the underburdened; perhaps employees who are overburdened can have some of their tasks simplified, combined with others, or outright eliminated.

Probably one or more of the holes was underburdened, causing an ignition of methane and coal dust.

Detonation of underburdened or overburdened explosive charges is extremely dangerous.

A blown-out shot of explosives that was stemmed with coal dust, or an underburdened shot of explosives could have ignited the coal dust.