For the purposes of Part 19—
“active access” means a surface access to underground workings which is in normal and regular use for the transportation of minerals, materials, spoil or men;
“ancillary mining land” means land adjacent to and occupied together with a mine at which the winning and working of minerals is carried out in pursuance of planning permission granted or deemed to be granted under Part III of the Act (control over development);
“minerals” does not include any coal other than coal won or worked during the course of operations which are carried on exclusively for the purpose of exploring for coal or confined to the digging or carrying away of coal that it is necessary to dig or carry away in the course of activities carried on for purposes which do not include the getting of coal or any product of coal;
“the prior approval of the mineral planning authority” means prior written approval of that authority of detailed proposals for the siting, design and external appearance of the building, plant or machinery proposed to be erected, installed, extended or altered;
“underground mine” is a mine at which minerals are worked principally by underground methods.