B. Any development required for the purposes of a mine which is carried out on an authorised site at that mine by the British Coal Corporation, their lessees or licensees, in connection with coal industry activities.
B.1. Development is not permitted by Class B if—
(a)the external appearance of the mine would be materially affected;
(b)any building, plant or machinery structure or erection or any deposit of minerals or waste—
(i)would exceed a height of 15 metres above ground level, or
(ii)where a building, plant or machinery would be rearranged, replaced or repaired, the resulting development would exceed a height of 15 metres above ground level or the height of what was replaced, rearranged or repaired, whichever is the greater;
(c)any building erected (other than a replacement building) would have a floor space exceeding 1000 square metres;
(d)the cubic content of any replaced, extended or altered building would exceed by more than 25% the cubic content of the building replaced, extended or altered or the floor space would exceed by more than 1000 square metres, the floor space of that building;
(e)it would be for the purpose of creating a new surface access to underground workings or of improving an existing access (which is not an active access) to underground workings; or
(f)from a date 6 months after the coming into force of this order, it would be carried out on land within the definition in paragraph F.2(1)(b), and a plan of that land has not, before that date, been deposited with the mineral planning authority.
B.2. Development is permitted by Class B subject to the condition that before the end of the period of 24 months from the date when the mining operations have permanently ceased, or any longer period which the mineral planning authority agree in writing—
(a)all buildings, plant and machinery, structures or erections or deposits of minerals or waste permitted by this class shall be removed from the land unless the mineral planning authority have otherwise agreed in writing; and
(b)the land shall, so far as is practicable, be restored to its condition before the development took place or to such condition as may have been agreed in writing between the mineral planning authority and the developer.