Ice wall, a barrier of frozen ground formed by the ‘freezing method’ of shaft sinking.

Idle rope, the return rope on an endless rope haulage. The rope that does not bear a load. (Scot.).

Idlers, -see ‘Rollers’.

Ill air, a stagnant atmosphere underground due to lack of ventilation. Noxious gas from an underground fire or chokedamp. (Scot.).

Impact ripper, a ripping machine using a boom mounted impact unit to deliver repeated high energy blows at the rip by means of a reciprocating pick.

Immediate roof, the strata immediately above a coal seam. -see Nether roof.

In-bye or Inbye. To travel into a mine is to go ‘in-bye’, i.e. in a direction away from the shaft. The opposite is ‘out-bye’.

Ingaunee, i.e. ‘ingoing eye’, the mouth of a drift mine; or a coal seam that outcrops at the surface. Also called a ‘Day Level’. (Scot.).

Inrush, a sudden, unexpected large make of water or other flowing material, such as sand or peat, into the mine, very often of serious proportions, causing casualties and disruption to coal production.

Inset, the entrance to underground roadways at the bottom or part way down the shaft where the cages are loaded and there is access for men and materials. Also called a ‘porch’.

Intake, any roadway underground through which the fresh air from the downcast is conducted to the working faces.

Interaction, the effects on underground workings from old workings either above or below due to the re-distribution of stress in the ground.

Iron balls, ironstone nodules.

Iron timbers, a term used by older miners for steel supports when they were introduced into mining.

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