The Gold Mine Stacks Bonus within Gold Mine Stacks online slot can deliver some powerful results. In fact, it can deliver wins in the vicinity of 50,000X your bet amount. To set it off, look to land three Bonus Symbols within the base game. There are different Bonus Symbols you could land: 5, 10, 15, 25, 35, 50, 125, or 250. Also, there are four different levels you can access. If you don't manage to land a single Bonus Symbol over three consecutive spins, the Bonus Game will come to an end.