The country's first alumina plant in Lam Dong province is now due to get its first product on September 20, the report said, quoting Tran Duong Le, deputy director of the complex's management board.
Last October officials said the $460M Tan Rai alumina plant, invested by state mining group Vinacomin, would start operations in February 2011 and begin exporting in March.
"Construction progress has been far behind initial plans because of unfavourable weather with much rain, prolonged power shortages, a lack of labour and slow procedures for importing equipment," Le said in the report.
The Tan Rai refinery is slated to produce 600kt/y of alumina.
Construction, equipment installation and test-runs have almost been completed in connection with a thermal power plant that serves the complex, the report said.
Vinacomin, or the Vietnam National Coal and Mineral Industries Group, has also been developing the Nhan Co project in Lam Dong's neighbouring province of Dak Nong, with projected initial output of 600kt/y of alumina.