 Complete the following phrase:  In 1802, after passing the necessary state exams at Freiberg, von Herder embarked on his professional career, taking a position as Mining Services Inspector Bergamtsassessor with responsibilities covering the mines in Marienberg, Geyer, Ehrenfriedersdorf and Schneeberg. Promotion during the ensuring twenty years was unusually rapid. In 1804 he was returned to Freiberg as Senior Mining Services Assessor Oberhüttenamtsassessor, which seems to have involved Mines Services Commissioner duties and wider oversight powers than before. 