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ENCI (Eerste Nederlandse Cement Industrie - First Dutch Cement Industry) is a Dutch company based in Maastricht. Their core business activity consists of the digging of marl out of St Pietersberg, which they use to make cement. The company uses the dug-up earth to make a new hill, called d'n Observant. Furthermore, there are plans to fill parts of the quarry holes with water for the creation of a water recreation area.

A pair of Eurasian eagle-owls have been nesting at the ENCI quarry since 2001, making the quarry one of the most well-known nesting sites for the bird in Western Europe.