He has acquired 183,500 shares in two on-market trades for total consideration of almost $52,000.
Derwin holds an indirect interest in Aeris through super fund Elephant Hills 202 of which he is a beneficiary.
The company produced 7,592 tonnes of copper in the June quarter from its Tritton project in New South Wales, an 11% increase on the previous quarter and the best quarter for FY2018.
Costs for the June quarter were $2.10 per pound for C1 cash costs and $2.79 per pound for all-in sustaining costs (AISC).
Aeris finished the 2018 financial year with total copper production of 26,686 tonnes after delivering a number of major capital investment projects at the project in the west of the state.
The company is also exploring for a large-scale iron oxide copper gold (IOCG) deposit within the Torrens joint venture copper-gold project in South Australia.
Recent airborne gravity surveys have resulted in 28 anomalies being identified.