Quarry Prospèr

“Carrière Prosper” is the name of the place that now houses around twenty climbing routes ranging from level 4C to 7A (more for experienced climbers). Adapting the quarry took around five hundred hours of work. “We have to remove the unstable stones, carefully inspect the quality of the rock and possibly fix it, and only at the end do we start drilling holes to install what we call ‘the pins’, i.e. the belay points,” explains Koen Hauchecorne, head of rocks at the Flemish Climbing Federation (this federation manages this site and a dozen others, and it’s more or less the same for its French-speaking counterpart).

In the Viroinval region there are many silent witnesses from days long gone, including tombs from the Bronze Age, the remains of a Roman villa and the cemeteries of Merovingians and Carolingians. People lived here since the old stone age, but the real development of the area only started in the Middle Ages. At that time the wood industry was flourishing; afterwards the iron industry flourished until the mid-nineteenth century. After that, quarrying was the main industrial activity until 1954. Today tourism is an important source of income.

He is talking about "Carrière Prospèr", also known as the Olloy climbing massif, located in the nature reserve "Natura 2000".
Mount Coach and the Belgian Rebolting Team realized 20 hooked longitudinal routes and about 10 boulders here under the umbrella of KBF.
For the sake of completeness: The climbing levels are mainly in the 5th and 6th degrees.