There is no Mining Mayhem bonus available. At least not one specifically promoted as such. Stake, if you’re familiar with the crypto casino, while superior on just about every front, does not really give cash bonuses.
But we do! A 100% up to $500 welcome bonus no less, with the promo code: “casinoguide“. If you need more info, you can find it here.
This bonus can then be used to play Mining Mayhem or any number of Stake slots or other casino games.