The production of a number of mining commodities and export earnings in Australia were down in the March quarter, according to new figures.

A report by the Australian Bureau of Agricultural and Resource Economics showed copper, zinc and nickel production fell below the previous quarter’s figures.

Australia’s mineral resource export earnings dropped by 18% to A$38.7bn.

Copper and zinc production fell at Xstrata’s Mount Isa operation, while Australia’s uranium output was down because of lower grade ore processed at Energy Resources Australia’s Ranger operation and BHP Billiton’s Olympic Dam.

Nickel mine production fell 10% in the March quarter to 44,000t following a number of mine closures in the previous half of the year.