its on the right of the train station in rocky ridge
The mines near Seers, it's a coal mine and there are trucks nearby that can hold up to 400 coal, after the cart is full, go back to seers and there's a cart station just near bank, take out your coal and bank it, simple, rinse and repeat.
They can be found when you search the mine cart at the mine location in the District 12 area
finish the mine cart
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).
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)
For a full explanation, see related link.
To get in a mine cart you just left click the cart to get in. To get you you left click the cart again.
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.
you find it in the mine that says "MINE not yours!" you go on the cart and get to the end. hope that helped!
Left click the mine cart.
On the Xbox360 edition you press left trigger to get into a mine cart.
A coal mine is typically referred to as a coal mine.