Strange rocks obtained by training Smithing are part of the Dahmaroc statue. 2 are required each to complete the statue each week. Strange rocks may be stored inside a statue collection bag.
Smelting normal ores, corrupted ore, smithing items from normal bars, making Cannonballs out of Steel bars, or working at the Artisans Workshop.
It does not matter what is smithed, so if a player is on a budget, it is advisable to smith with cheap materials such as bronze bars or gold ore.
Activities that do not yield rocks: Superheating, smelting ores in the Blast Furnace and protean bars smithing.