There is the Gripps level, north of Leadhills, in the valley floor. You will see a large iron pipe, and slightly upstream a shaft with one side collapsed. However, I am told that the adit upstream is blocked and there is a huge head of water behind the blockage.
You can at least look down one of the shafts at about NS885140. Concreted wire mesh bars the way in, but as it drains through Gripps, expect deep water anyway.
Drainage adit (the lowest) at about 860138, but the portal is sagging somewhat, the sides of the exit cutting have slumped, raising the water level, and I have heard that it is blocked not very far in.
Bay Mine drainage adit at 866135, under the road. Grille may not be impassable. Those who don't care about vandalising things could get into the shaft above, there is already a very small hole in the side of the brickwork below the concrete cap. Maybe someone will have already enlarged it.
Whyte's Cleuch drainage adit somewhere around 862138, under the road has collapsed, The fenced hole just across the road may provide access.
Allegedly the Horse Level somewhere near 863133 (west side of valley) is only closed by a few stones. There may be other entrances nearby. Warning! Very deep stopes, possibly unstable. There are some collapses showing at the surface, usually fenced.
Upstream of the Bay Mine, about 867137, east side of valley, is one adit, possibly two.
I know of a few others where entry might be possible, but as they have been walled or bulldozed, I think the landowners would not be amused. Anyway, I am sure none of us would encourage vandalism. Sad, because at least one did give access to quite extensive workings as recently as about 1970. But I have not seen the entire area.
By the way, the hills are a no-go area in the grouse season.
Alan