Iron ore giants BHP Group BHP.AX, Rio Tinto RIO.AX, and Fortescue Metals Group FMG.AX tumbled between 1.4% and 1.7%. By Ayushman Ojha April 5 (Reuters) - Australian shares closed little changed in range-bound trade on Wednesday, with gains in gold miners countering losses in base metals and energy firms, while New Zealand stocks fell after the central bank delivered a bigger-than-expected rate hike. A day after the Reserve Bank of Australia (RBA) left its cash rate unchanged, Governor Philip Lowe said a pause did not imply an end to tightening, which could be needed to contain inflation.