Surmount is a related term of the mount.

As verbs the difference between surmount and mount is that surmount is to get over; 

overcome while the mount is to go up; climb; ascend: to mount stairs.

As a noun, mount is a mountain or mount can be an animal, usually, a horse used to ride

on, unlike a draught horse.

Or mathematically let us understand the concept by an example:

Suppose there is a cone lying above the cylinder.

Then we can say that cone is mounted on cylinder or cylinder is surmounted by a cone.