The dwarves of the Dwarven Mine are an industrious bunch and get through a lot of pickaxes. Nurmof, the pickaxe sales-dwarf, has always had trouble keeping up with demand and, as RuneScape shops have limitless stock, he can't possibly make enough pickaxes on his own.
Being a dwarf, Nurmof has solved his problem the dwarven way: through automation! His cave in the Dwarven Mine is now home to a machine that churns out pickaxes night and day. Powering it has become something of a problem, so Nurmof has commissioned a power station on the surface, near the mine.
Projects of this scale are rarely without their problems: a hapless dwarf has lost part of a delivery to the power station, and an adventurer is needed to recover it. As is customary on RuneScape, this may not be the end of that adventurer's involvement...