| Check weight man | A man appointed and paid by the miners to check the weighting of the coal at the surface |
| Chock or Cog | A square pillar for supporting the roof constructed of timbers laid up crosswise in alternate layers the center being filled with waste material |
| Chock | A tapered piece of wood placed in the kerf to keep it open until ready for blasting |
| Cleat | Vertical cleavage in coal seams |
| Coal Cutter | A machine used to undercut a coal seam one who operates such a machine |
| Coal Dust | Very finely powered coal |
| Coke | Carbon left after the volatile materials in the coal have been driven off this was done eon in coke ovens where the coal was roasted to produce coke. Coke was used in smelting. |
| Colliery | The whole mine plant including the mine and all adjuncts |
| Congolmerate | A sedimentary rock often found in the strata often found in coal fields consists of pebbles and rounded rocks cemented together with finer materials sometimes called millstone grit |
| Coursing the air | Conduction air through the workings by means of doors and brattices |
| Creep | the upheaval of the floor due to tender or floor or the sagging of the roof of the mine due to the weight of the unsupported rock |
| Crosscut | A tunnel driven through or across the rock strata from one seam to another a small passageway drive at right angles to the main entry to connect to a parallel entry or counter entry |
| Curtain | A sheet of brattice cloth used to deflect an air current |
| Cutter bar | That part of a cutting machine that works its way into the coal carrying the cutter chain with its cutter bits |
| Damps | See Blackdamp, Firedamp, Whitedamp, and Afterdamp |
| Dead work | work that is not directly productive such as cleaning up rockfalls and re timbering airways etc |
| Detaching hook | A self acting mechanical device for releasing the winding rope from a cage when the latter is raised beyond a certain point in the head frame the rope being released the cage remains suspended in the frame |
| Dip | A down slopping entry tunnel |
| Dobson Hoist | A small compressed air hoist used on Vancouver Island built in Nanaimo |
| Dog | A short heavy iron bar used as a drag behind a car or trip of cars when ascending a slope to prevent them running back in case of an accident |
| Downcast | The opening through which the fresh air is drawn or forced into the mine: the intake |
| Drift | A tunnel driven into the rock from one seam to another |
| Drippers | Water percolating through the roof of the mine into the working areas |
| Driver | The worker who drives horses from a gathering point to the mechanical haulage (Northern England) on Vancouver Island used more generally for anyone who drives mules or horses underground |
| Droopers | Water dripping from the roof |
| Drummy | When the roof of a min sounds loose open or weak when struck by a tool to test the condition of the roof |
| Engine Plane | An incline where the hoist is at the top and the trips are hauled up by power and loaded by gravity pulled the rope after them |
| Entry | A main haulage road, gangway or airway; an underground passage used for haulage or ventilation |
| Face | The place where the coal is actually being worked either in a room or in longwall |
| Fault | A fracture that breaths the continuity of the seam of coal |
| Fire Boss | A section foreman responsible for blasting and supervising a loading crew, haulage, and several brushers on a longwall face the total crew might be sixteen men; also inspects the mine for gas |
| Fire Damp | A mixture of air and methane gas (CH4) |
| Friable Roof | Very unstable materials in the roof of the workings's easily crumbled rock material in the roof |
| Gathering Point | Place in the mine were trips of cars are made for their journey to the shaft bottom |
| Gob or Goaf | That part of the mine from which coal has been mined; the space that is left usually filled with waste |
| Hang the Monkey | Term applied when the mine cage is lifted too high the safety hooks leave it suspended in the head gear above its normal level |
| Head Frame | A structure of wood or steel erected over a shaft to support the pulley wheels by which the cages are raised and lowered also called head gear |
| Heaving | The gradual lifting of the floor of a seam where coal has been removed |
| Helper | A miners assistant or one who works under a trained man |
| Hewer | A collier who cuts coal by hand pick |
| Hoist | A machine used to hoist coal under ground or to haul the cages in the shafts normally driven by electricity or compressed air |
| Holing | The portion of the seam removed by hewing or cutting to ciliate the breaking down of the coal |
| Inbye | In a direction inward toward the workings or away from the shaft bottom |
| Incline | A raising entry level tunnel (haulage road) |
| Iron Man | A cutting machine |
| Keps or Keeps | Catches to hold the cage when it is at a landing other then the shaft bottom |
| Kerf | The undercut made to assist the breaking of the coal |
| Kneepads | Leather or rubber protection worn over the knees when working in thin seams |
| Lagging | Timber planks or slabs used for immediate support at the face used as crosspieces on longwall timbering (see strap) |
| Latches | A synonym for railway switches or turn about's used in the mine trackage |
