Before Volcano, the Mountain did incorporate three attractions: 
 
1) The mine ride you reffer to was in actuallity a dark ride of some sort, and when I was there in 1994 they had some signage about a dinosaur themed dark ride going in its spot.  I guess that never happened :)  
 
2) Haunted River or Forbidden River something like that, it was sorta like Splash Mountain at WDW.  The same two across logs, and the first half was a dark ride then you went up a hill, and as you went down the big drop you exited the mountain, again sorta like Splash Mountain. 
 
3) Time Shaft - a celverly themed indoor Rotor. 
 
I deeply regret that they evicted all three residents of the mountain.   
 
 
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David Bowers 
Mayor, Coasterville