quest-Rich mine (Randall) (Gothic 3)

Killed all the crawlers in the mine, but the quest is not performed, Randall anywhere them mine is not. The whole mine is 25 times already climbed(there is only a left turn where Randall ore is mined and right, and then up, where there was one slide, pole stands and a chest of iron). Maybe something not so do?
PS is patch 1.6.3