The stone spirit sends ore to bank for you and gives you a small chance of receiving higher level ore, sent directly to your bank. After each dose of Juju mining potion is consumed a five minute period begins during which each ore mined has a 10% chance of finding a stone spirit.
When you find a stone, you will get a message "A stone spirit appears and offers to carry your next few loads of ore to the bank."
When mining "The stone spirit magics your ore straight to the bank." A swirling colour effect will appear above the player's head and shoulders when this occurs.
When the spirit disappears you get the message: "The stone spirit burrows down at your feet."
The stone spirit will send all ores mined directly to the bank for 30 seconds, including extra ores obtained with the Varrock armour and bonus ores gathered from concentrated coal and gold rocks. More than one stone spirit may appear during the 5-minute window. Up to six stone spirits have been recorded, but in theory, eight or nine are possible.