At the site in Maastricht, limestone (marl) is extracted from the 135-hectare quarry and burnt in a kiln to make clinker, which is then ground into cement.
The ENCI company, the City of Maastricht and the Province of Limburg have agreed on the termination of the limestone quarrying in 2018 and the future development of the area from 2010 onward. The quarry will be transformed into different zones for the countryside and recreation, including 60 hectares of natural biotopes. In October 2010, ENCI already transferred the ownership of several smaller parts of the area to the nature conservation organization Natuurmonumenten.
The whole surrounding of the quarry is an official nature protected area and appointed as Nature 2000 area.
The quarry includes at first a wide range of wet biotopes of very high quality, some of which are uncommon, especially in the Netherlands.: springs on rocky walls, small puddles on chalk, puddles and lakes with nice reed-beds, shores with rushs and with Bidens tripartite. 24 species of Dragonflies were recently inventoried there, but 28 were already observed there by diverse observers. Some are registered on the Dutch red list.
This quarry also have nice fallow lands on limestone, sands and gravels of ancient beds of the Maas river. The vegetations found are from practically naked grounds until afforestation, including calcic vegetations and agricultural fallow lands. Some highly endangered butterflies for the Netherlands where already found there, like Erynis tages.