Disc Cutter

The application relates toa method of mining a rock formation 2 using a cutting system comprising a cutting assembly 10 and a rock breaker tool, the method comprising: providing a cutting assembly comprising a plurality of disc cutters 18 arranged spaced apart on a spindle 16; providing a rock breaker tool with a tool head; advancing the cutting assembly into an operational position; cutting into the rock formation using the disc cutters to create a series of linear cuts spaced apart by rock pillars; retreating the cutting assembly from the operational position; inserting the rock breaker tool into one of the cuts created by the disc cutters such that the tool head is fully positioned within the cut; activating the rock breaker tool, thereby triggering the tool head to make contact with at least one adjacent rock pillar. A rock breaker tool (fig. 18) comprising an elongate tool body and a tool, a rock breaker tool (fig. 21) comprising a tool head, the tool head comprising an elongate disc carrier, a base mount, and one or more mini disc cutters supported by the disc carrier, the disc carrier being moveable relative to the base mount and a cutting system comprising a disc cutter and a rock breaker tool are also as claimed.