C.1 Development not permitted
Development is not permitted by Class C 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 rearranged, replaced or repaired, whichever is the greater;
(c)any building erected (other than a replacement building) would have a floor space exceeding 1,000 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 1,000 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)it would be carried out on land to which the description in paragraph F.2(1)(b) applies, and a plan of that land had not been deposited with the mineral planning authority before 5th June 1989.