It is quite a late answer, sorry.
Often I say to myself that I should be more active in this forum, but ....
Yes, I found very nice minerals in the past: galenite, siderite, millerite with annabergite, coloured stalagtites ...
I have been in this region in spring 2022 again.
Interestingly there is a gallery belonging to the Mina Regia that is still accessible.
We didn't explore it entirely. there was some galenite, not many other things. But you have access to the main shaft.