Each dose of the potion lasts for one hour. While the potion is in effect, each ore mined gives a 10% chance of finding an enhanced stone spirit, which does the same thing as the regular juju mining potion (automatically banking ore), and also will smelt ore that the player mines. The stone spirit will not appear while mining rune essence, pure essence, crablets, or stardust. However, the stone spirit will appear but will not smelt anything for smithing experience while mining clay, limestone, coal, sandstone, gem rocks, granite, red sandstone, and crystal-flecked sandstone.