Mined Land Reclaimation

Perhaps they don't currently accept those types of groups due to the potentially hazardous environment. Acidic water runoff, the safety stair retrofitted mill itself, and the hill the mill is on could pose risks to overly curious individuals. The informative part of the tour, provided by the guide and signs, involves a considerable amount of chemistry and history; I believe the experience would be overall more enjoyable at an older age.

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