For fans of this game, I'd like to recommend Candy Box 1 & 2. It has a similar feel, except Candy Box's active component becomes quite engaging later in the game.
This is similar to an old game called MinerVGA for DOS. I had fun with that, and I enjoyed this, although I would have liked to see a highscore chasing version mode where there is some limit to how long you can play, like increasing energy costs or a limited number of trips to the surface.
This uses many copywrited images that belong to Electronic Arts, if I'm not mistaken... and they aren't the friendly type that allow people to use anything they own.
 "Idle Mine"){kind=icon}
 "Earn to Die 2012: Part 2"){kind=icon}
 "Utopian Mining"){kind=icon}
 "Multitask"){kind=icon}
 "Defender"){kind=icon}