Oz Minerals' copper-gold project, Carrapateena, is on track with construction nearing completion and the first saleable concentrate on schedule for November.
Situated north of Port Augusta, the site is one of the country's largest undeveloped copper deposits and the mine is expected to have a life of 20 years.
The company provided an update on the project, as well as other operations across the world, in its third quarter report.
Chief executive officer, Andrew Cole, said 180,000 tonnes of development ore was stockpiled on the surface.
"Production drilling has commenced on the first production level and underground decline development has moved beyond the fifth production level access," he said.
"The site is now connected to the grid network and staged energisation of the minerals processing plant is underway.
"Underground crusher chamber works are well advanced and the conveyor decline installation is tracking to plan."
A total of 3,173 development metres was achieved during the quarter with total development reaching 18,300 metres (4,573 metres to the face of the Tjati decline) and a vertical depth of 662 metres.
In its report, Oz Minerals said Carrapateena's high voltage reticulation system was well progressed with permanent underground power expected shortly.
"Portal conveyor steelwork and conveyor module works are underway and completion is on track for Q1 2020. The 3.2km conveyor decline belt installation and commissioning is expected to be completed in Q1 2020 as planned," the report read.
"The minerals processing plant has progressed to the completion and commissioning phase. All major structural components and equipment are constructed with the balance of piping and electrical being finalised. The site is connected to the state grid power network and staged energisation of the plant is underway."
"The Tjungu accommodation village is connected to permanent power with diesel generation now re-allocated for backup service.
Also in South Australia's outback, the company's Prominent Hill operation is on track with production.
"Prominent Hill production is expected to end the year comfortably within guidance," Mr Cole said.
"Looking ahead to the end of the year, we are firmly focused on delivering first saleable concentrate at Carrapateena and achieving our forecast production, cost and other targets at Prominent Hill."