yesterday i put 1 manuscript in the skill 'quality copper mineshafts' of my jolly geologist, which means 15% chance of finding copper deposits that can be mined faster (twice as fast). since then all copper deposits he found (6 so far) are with this feature.
am I that lucky or is it a bug ? can someone confirm ? because I remember from test server, I was not so lucky there.
when my copper mines deplete and geologist finds new ones I'll post more info.