Instructions
Find one of the many "Dig Site" signs around Club Penguin and click on it to travel to the Mine.
Click on the free box of helmets at the entrance of the Mine to pick up a mining helmet.
Enter the Secret Cave. It will have a large caution sign next to the entrance that reads: "CAUTION! Digging in Progress"
Throw a snowball into the power generator to light the cave.
Equip the helmet and dance in the designated spot to dig for buried treasure.