4   Certain things are part of a coal operation

For the purposes of this Act, any building, structure, pit, shaft, drive, level, drift, excavation or work within a colliery holding:

(a)  that is in the course of construction and that is intended to be part of a coal operation, or

(b)  that is a part of a coal operation and that is in the course of being abandoned, or

(c)  that is a part of a coal operation the operations at or in which are in the course of being discontinued,

is taken to be part of a coal operation.