Australia’s mining and heavy construction industry may decline in 2011 for first time in seven years, according to Bis Shrapnel.

The segment, which accounts for one-third of Australia’s A$25bn ($21bn) building sector, is expected to drop 3% over the next 12 months ending June 2011, although it is expected to rebound next year with double-digit growth.

The decline is driven by the completion of alumina refineries, coal and iron ore projects, according to Bloomberg.

Coal and iron ore projects will gain momentum by 2012-13 and by 2015 base metals investment will increase.