It is legitimate, in this connection, to refer to the expanded definition of the word "coal mine" in section 2(b) of the Coal Mines Provident Fund and Bonus Schemes (Amendment) Act, 1965 (Act 45 of 1965) which reads as follows: "(2) for clause (b), the following clause shall be substituted, namely: (b) 'coal mine ' means any excavation where any operation for the purpose of searching for or obtaining coal has been or is being carried on, and includes (i) all borings and bore holes , (ii) all shafts, in or adjacent to and belong to a coal mine, whether in the course of being sunk or not; (iii) all levels and inclined planes in the course of being driven: 263 (v) all conveyors or aerial rope ways provided for bringing into or removal from a coal mine of coil or other articles or for the removal of refuse there from; (vi)all adits, levels, planes, machinery, works, railways, tramways and sidings, in or adjacent to and belonging to a coal mine; (vii).all Workshops situated within the precincts of a coal mine 'and under the same management and Used for purposes connected with that coal mine or a number of coal mines under the same management; (ix). all power stations for supplying electricity for the purpose of working the coal mine or a number of coal mines under the same management; (x) any premises for the time being used for depositing refuse from a coal mine, or in which any operation in connection with such refuse is being carried on, being premises exclusively occupied by the employer of the coal mine; (xiii). .any premises in or adjacent to and belonging to a coal mine, on which any plant or other machinery connected with a coal mine is situated or on which any process ancillary to the work of a coal mine is being carried on;" It should be noticed that in sub cl.