Cloncurry junior miner CuDeco is looking for a new managing director.
The company released a short statement this morning saying Dr Dianmin Chen had announced his resignation.
The board expressed its thanks to Dr Chen for taking the business from an explorer into production.
A replacement is yet to be named.
The company is developing the Rocklands lease about 20km west of Cloncurry.
It achieved shipments of 600 wet metric tonnes native copper and 5000 WMT copper concentrate from the operation in December 2016 and is on target to complete scheduled shipments this month of 4500 WMT of copper concentrate and 500 WMT of native copper.