Several Mining Modifiers trigger at random during the base game. Mystery Blast will place Mystery TNT boxes on the board that will explode and reveal identical symbols. Boomer Bonus Add will add gold nuggets to the board and trigger the bonus game. With Boomer Lose to Win, Boomer Lose to Win will turn a losing spin into a winning one.
The main feature of this game is the Gold Hold & Win Respins bonus game. It is triggered when five or more gold nuggets land on the board. The Hold & Win game gives you three respins, which are reset when a new gold nugget or a modifier hits the board. Modifiers are Reels Boosts, Extra Lives, Boost Values, and Multiplier Boosts. Sometimes Boomer will come along and dig up some gems to help keep the game going.
The bonus game is where you can also trigger the three static jackpots. The Mini jackpot is worth 25x, the Mega is worth 50x, and the Mega jackpot is worth 100x. Respins continue until the counter reaches 0 or you fill the board.
A Buy Feature also allows you to purchase the bonus game for 75x your bet.