Galena Mining managing director Tony James said construction was 87% complete at Abra, a 60:40 joint venture in WA's Gascoyne with Japan's Toho Zinc.

"It's both exciting and extremely rewarding for everyone involved to see several areas progressing quickly into commissioning at the mine," he said.

"With the site power station, power-on scheduled for the second half of October, the processing plant commissioning plans have been finalised and these plans will be executed at the same time and then continue to roll through to January."

James said process plant engineering, procurement and construction had reached 93% complete while structural steel was 98% complete.

Mechanical installation was 73% done and piping and electrical works were 48% and 36% complete respectively.

Commissioning of the Pacific Energy hybrid liquid natural gas-solar power station was also nearly finished, with dry commissioning of the crushing and screening areas in the processing plant to start in the second half of October.

James said the focus was on finishing the processing facility and underground development of the mine, which accounted for $19.2 million of the remaining budget forecast of $30.6 million.

"Record development metres underground in September has taken us down to the top of the orebody and work has started on the first access drives," he said.

"In recent days the completion of the first stage of the tailings storage facility is also a significant milestone."

Mine decline development in the East decline hit 285m to reach the 1300m level.

This was the highest level of development in a month since the first cut was fired in the portal in 2021.

The decline is 250m vertically below the surface and 13m vertically below the top of the orebody.

James said grade control and infill diamond drilling continued during September with the introduction of a second underground drill.