Mole Gap to Reigate Escarpment and there are well developed river cliffs where alluvial fans have diverted the River Mole against the valley sides. Mole Gap to Reigate Escarpment Mole Gap to Reigate Escarpment is a biological and geological Site of Special Scientific Interest west of Reigate in Surrey. It is a Geological Conservation Review site and a Special Area of Conservation. Part of it is a Nature Conservation Review site, Grade I. Two small private nature reserves in the site are managed by the Surrey Wildlife Trust, Dawcombe and Fraser Down. This eight mile long site on the North Downs contains an outstanding range
De Hiemerter Mole, Burgwerd diesel engine was removed in the mid-1970s and an automatic pumping station built. In 1973, the mill was bought by De Hollandsche Molen. In 1976, the mill was restored to working order. On 16 May 1988, the mill was sold to Stichting De Fryske Mole (English:"Frisian Mills Foundation"). "De Heimerter Mole" is what the Dutch describe as a "spinnenkopmolen" (English: "Spider mill"). It is a small hollow post mill winded by a winch. The four Common sails, which have a span of , are carried in a wooden "windshaft". The "windshaft" also carries the "brake wheel" which has 29 cogs.