I have an abandoned quarry near my house, in which I would like to make a hiking route.
Almost all of it is enjoyable hiking and easy scrambling, except one part, which requires climbing (estimated French grade - 4) up about 5 metres, on a wall with mostly unstable holds. So I wonder whether it would be possible to remove (with bare hands or tools like crowbar) all the unstable rocks, and leave a rock face that would be safe to climb.
The rock at the quarry is limestone with varying quality. We have a climbing wall with bolted routes not far from there (I mention that to make it clear that the rock itself is climbable).
So, is such "cleaning" possible? Does the answer depend on whether explosives were used in the quarry?
(BTW I am not interested right now whether this is legal)
For reference, here is a picture: