Are you brave enough to ride the Mine Train Coaster? Take a trip through this Gold Mine, but watch out for the explosion. Get to sluicing with the other prospectors or have Golden Popcorn at the stand. This set is quite similar to the Egyptian coaster, but this one is chained. A mine theme works a lot better with a mechanical theme. For inspiration I looked at the game RollerCoaster Tycoon by Chris Sawyer.
This set would make for an excellent Lego set because it combines greatly with old-school Western Lego Sets, it has a lot of play features, the 8 shaped track makes it small yet exciting, the supports make it sturdy yet low in pieces and the set has a lot of height.
The set exists from modular sections:
The mountain mine
The explosion drop (a variation on the water drop of the Pirate Coaster)
The chain lift
The ticket booth/miners cottage
The mine/shaft with crane wheel/cactus
The mine/shaft with roof/sluicing section
The set has about a 1000 pieces. Have fun!