Iron ore mining giants BHP Group Ltd BHP.AX and Rio Tinto Ltd RIO.AX slid 1% and 1.5%, respectively. By John Biju June 13 (Reuters) - Australian shares logged small gains on Tuesday on the back of technology and banking stocks, offsetting heavy losses on the mining index, while investors await key U.S. inflation data and the Federal Reserve's interest rate decision. Meanwhile, investors will closely monitor U.S. inflation data for May, due later in the day, to assess the impact of the Fed's rate hiking cycle and also for clues on the central bank's future policy path.