IRONORE/ BHP Group BHP.AX joined Rio Tinto in warning about labour shortages and inflationary pressures. July 19 (Reuters) - Australian shares drifted within a tight range on Tuesday as losses in technology and financial stocks offset gains in the resources sector, after recession worries increased due to warnings from Apple Inc AAPL.O and Goldman Sachs GS.N. .N Investors are also awaiting minutes of the Reserve Bank of Australia's July meeting for more clarity on its policy tightening stance.