By Praveen Menon (Reuters) – A report released by Rio Tinto on Tuesday outlined a culture of bullying, harassment and racism at the global mining giant, including 21 complaints of actual or attempted rape or sexual assault over the past five years. Nearly half of all employees who responded to an external review of the miner’s workplace culture commissioned by Rio said they had been bullied, while racism was found to be common across a number of areas. Rio Tinto Chief Executive Jakob Stausholm said the results were “disturbing” and the company would implement all 26 recommendations from the re…