The mine cart ride is the final challenge at the Diamond Mine on Nabooti Island. The only thing you need to do is duck down when you are close to the ceiling, and jump up to avoid the boards immediately after that (repeats three times).
(see related question)
In the Diamond Mine on Nabooti Island, you have to DUCK DOWN into the cart when the ceiling is low, and JUMP over the rocks that stick up. You should jump no later than the time you see the "jump" sign.
All you need to do in the Diamond Mine cart is to duck down into the cart when the ceiling gets close, then jump over the wooden barriers (it says "Jump" a little late).
you push the cart till you see the tilt on the track then hop on
On the mine carts you duck jump duck jump duck jump then stay
There are three sets : 1 duck and 1 jump each with the same spacing.
In the diamond mine is the White Jewel.
you get a gem in the mine
There is no oil can on Nabooti Island. For the Diamond Mine, see the related question below.
Once you are in the mine cart, you have to "duck down" when the cart goes up close to the ceiling, then JUMP when you come to a rock sticking up (you should jump "before" you reach the sign that says "jump"). This repeats three times. (see related question)
You have to dodge one, then jump from one cart to another until you reach the top. Then wait for one to pass and quickly duck into the mine.
Dodge the mine carts, go down the elevator, blast the rock and the wall, ride the mine cart, and get the White Jewel from the diamond pile. (see related question)
the white jewel.