An adjustable scaling bar may feature a two-piece handle design with two coaxial tubes which may be variably lengthened and secured. A neck portion of the handle supports a scaling chisel while the outer handle portion supports the neck portion. The scaling bar may be collapsed to a smaller length when needed for transport but may also be extended to a longer length for use. A collar may be added to support other tools.

An adjustable scaling bar may feature a two-piece handle design with two coaxial tubes which may be variably lengthened and secured. A neck portion of the handle supports a scaling chisel while the outer handle portion supports the neck portion. The scaling bar may be collapsed to a smaller length when needed for transport but may also be extended to a longer length for use. A collar may be added to support other tools.

This disclosure relates to a method of mining a rock formation using a disc cutter and a rock breaker tool. Several examples of rock breaker tool are provided, including mini disc cutters and a form of hydraulic striker. The tool is inserted into slits cut into the rock by the disc cutter and activated, causing crack initiation and propagation in the rock.

There is provided a method of mining rock using a disc cutter comprising a cutter body with a diameter, d, and a thickness, t, a plurality of tool holders mounted about a peripheral surface of the cutter body and a plurality of cutting elements attached to the tool holders, the method comprising the steps: cutting a first slot in the rock at a first cutting position of the disc cutter, moving the disc cutter to a second cutting position which is to the left or right of the first cutting position, and cutting a second slot in the rock, such that the second slot is spaced apart from the first slot by distance S, at least one of the first and second slots having a depth of slot D, and wherein a ratio of depth of slot D, to distance S, is in the range of 2 to 16.