There used to be three attractions housed in and around the volcano. As mentioned above, there was an indoor rotor housed entirely inside the volcano. There was also a family ride (mine type ride I believe) based on the Smurfs (thus is was called Smurf Mountain). The last ride was a haunted log flume ride that meandered inside the mountain and ended with a splashdown going down the side of the mountain. I am not sure exactly what you saw, but it could have been air gates for any of those 3 rides.
Happy Coastering!
Sean
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"Have fun stormin' the castle!"
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