.. just wanted to say else that Luka does not mean any name Luke nor Lukáč in Slovak, but it's a meadow just like in your language. So there are mines under meadows? That sounds more logical than a mine of some unknown Lucas.

Well luka nowdays means port, often word for meadow is "livada", about mines under meadows, maybe, I'm not sure.

I'm sorry, I'm like a blind…