Help with the quest

[Jat]

Hi everyone, I have a quest for a miner:
"Bring schrifteiz to Meroski".
I carried ore, coal, tools, but he doesn't accept anything. Is this a bug, or do I just not understand what I need to bring?

[gravesmerch]

schrifteiz is kinda uncommon ore, I'd usually drop that quest

but if you really have it, left-click item to pick it up, then right-click quest giver