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Pin Dale is near Castleton and is a Site of Special Scientific Interest because of its nationally important limestone geology. It also has historic lead working remains, and rare habitats for unique plants and flowers. It’s particularly vulnerable because it has an unsurfaced track that is legal for cars and trail-bikes. The problem has been irresponsible drivers and riders who have used it as a race-track or rubbish dump – and driving off road. English Heritage, working with Natural England and Lafarge, have now fenced and blocked off the sensitive areas but damage is still occurring.