Hi there, Katie....There are three conveyor belts that have to be in the "on" position and moving rocks before the crusher puzzle will work properly. Following are Chris Scott's instructions about how to find em' and turn em' on, from the point where you have just solved the Paddle Wheel puzzle in the Mines:
WARNING SPOILER:
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5.Walk across the stream and turn right.
6.Pull the switch, but don't proceed into the mine shaft, yet.
7.Turn right, cross back over the stream and walk to the end of the tunnel.
8.When you reach the end, turn left and continue forward two positions.
9.Turn right and proceed to the end of the passage, bearing right when the tunnel does so.
10.You have reached the end when you reach the conveyor belt.
11.Activate the controls for the conveyor and turn around.
12.Proceed along the passage until you reach the end, where you will turn left and move forward.
13.When you return to the junction alcove with three archways, move into the middle passage and activate the conveyor
belt you find there.
14.Exit close-up and proceed along the right tunnel branch until you reach another junction alcove, bearing left when the
tunnel does so.
15.At this junction, proceed through the center archway and activate the controls for this conveyor belt. Rocks should
be moving along the belt as did the other two conveyor belts.
16.Exit this close-up and turn around.
17.Head back down the corridor and after the tunnel bears right, turn right, but only go forward one more position and
turn left.
18.You should see the entrance to the mine shaft at the other end of the tunnel.
19.Advance to the entrance to the mine shaft near the paddle wheel and to the end of the tunnel.