The above photo of the Magnsite mill that includes an updated crusher. It is on the far right side of this image. The following photo is a cropped blown up version of that image.
It is lamely the framework for the crusher contained a Blake Crusher as shown in the following photo. Ore was fed into the top, crushed with the crushed ore coming out the bottom.
While it would be possible to scratch build this crusher, another alternative would be to bash a coaling tower kit. Campbell Scale Models has a coaling tower that has the same feel as the crusher at the mill.
The hoist and the top portion of the coaling tower would n red to be removed in modeling the crusher.