|back||term used for the area overhead. The roof of the working place.|
|back holes||the shot holes drilled across the top of a round|
the method of extracting the lode by means of benches being drilled and blasted, with the extraction proceeding upwards, the miners standing on the broken ore from previous blasts. Periodically the broken ore requires ‘pulling’ to make sufficient room for work to proceed, broken ore taking up 50% more room than before it is broken out.
|bagging||air hose (Wheal Jane)|
|bal||old term for a mine or mine working.|
the surface part of a shaft also known as the collar, the area around the shaft head.
the person responsible for carrying out the duties and operations required at the shaft head.
|bar||length of steel rod, used for many lifting and prising operations.|
|baring down||(same as scaling down) bring down loose rocks, making safe.|
|bar & arm||
a method of holding a rock drill in a specific position, comprising a substantial screw jack bar between the floor and the roof with a moveable horizontal bar clamped to it. The rock drill is mounted on a screw feed cradle that is clamped at the required position on the arm.
a substantial brattice or fence to prevent inadvertent access to a danger area, for instance a hole in the floor, stope edge, or old unventilated workings etc..
the common wheel barrow, used extensively up to the 1970’s for mucking out small or inaccessible workings, i.e. long inters.
a mass of plutonic rock, such as the granite masses in and around which the main ore bearing lodes occur in Cornwall.
|battery||What an exploder was usually called|
|bearer||Steel or timber joist on which other timbers are supported|
The step in any sort of stope, generally the length of the drill steel being used.
The part of the rock drill that is in direct contact with the rock being drilled. The action of which is to pulverise the rock.
a) Button bit: A bit in which are set a number of
hemispherical pieces of tungsten carbide
The term used for the use of explosives to shatter rock in mining operations
Once a chute was no longer required the extraneous timber work was removed to leave the stulls and brow. Planks or half pieces were then used to fill in the remaining area to prevent rock dropping through from above, with the drive cleared of the box part of the shute.
A line of, generally, stope chains hanging from eye pegs in the back to which are attached planks, steel sheeting, lengths of old conveter belting etc., to protect more sensitive areas from rocks thrown during blasting operations.
A term for a detonator (also known as a ‘DET’) though in Cornish mines it was generally called a cap.
A length of square section timber up to 4 metres long, either used alone, or attached to others, to which a bomb is securely attached. The staff is then pushed up into inaccessible places to bring down hung up rock in boxholes, drawpoints, or passes.
|blasting using mud||
Mud Blasting is a term used in secondary blasting when, after an explosive charge was placed on a rock, a cap of thick mud was slapped over it to enhance and direct the force of the explosion into the rock.
|blasting long holes||
A number of long holes in a ring or rings blasted using millisecond delay detonators. The mine was generally cleared of all other personnel at this time. Some blasts comprised of up to a tonne or more of explosives loaded into 30 or 40 holes up to 25m long.
|blind cover||solid wood cover, above, below or to the side.|
|block & tackle||
generally a pair of three sheave blocks rove with good quality rope to facilitate lifting heavy materials & equipment in remote places.
|blowpipe||metal pipe for blowing holes clean, with compressed air, also plastic version for washing clean should explosives be present.|
|bomb||explosive charge usually to bring down a ‘hang up’.|
these are used as a set of three. Each ‘rod’ is a short length of lath with another piece set at right angles on one end. All are the same length and are used by looking through the three over a distance to enable a straight line to be accurately sighted
the arm on which a hydraulic or large compressed air drill and cradle is mounted. The boom can be hydraulically adjusted to position drill.
a term rarely used at South Crofty, for a timber chute.
|boxhole||a hole about 6’ x 5’ x 25’ mined upwards in a lode drive.|
|brattice||another term for a secure fence or barricade.|
|break out clean||
‘Break out arse’, Expression used to indicate a round has broken out to the full extent of the hole depth, leaving few or no sockets.
|breast||a term for the area in the middle of the working face.|
the holes in a development round at chest height outside the cut and easers and within the side holes.
a term sometimes used for a rill stope, whereby the stope face was advanced from the rearing, with the drilling generally horizontal.
The edge over which broken rock moved to enter the box part of the chute.
Most timber chutes had a length of GWR held by heavy duty staple like spikes to act as a wear resistant brow piece.
A term for anything that holds water, rock or
|buddle||A device used in the separation and concentration of ore|
|bullring||a solid collar left after blast|
|bullnose||Point of ground where two drives separate|
|burn cut||see under ‘Cut’|
a bundle of short, thin and stiff wires in a small holder, carried by most mineworkers in the days of carbide lamps. It was used to clear the gas jet of the lamp if it became clogged.
|burra||Burrow, Barrow, - Terms used for waste heaps on the surface|
|butt||the body of a mine wagon, or any other vehicle which carries the payload|
Peter Hughes has
supplied words of this colour
D.C.Williams at Exeter University, better known as Gus. has supplied words of this colour
The remainder are supplied by Michael Davis