How Rio Tinto, Fortescue and BHP shares stacked up in July

Rio Tinto Ltd (ASX: RIO), Fortescue Ltd (ASX: FMG) and BHP Group Ltd (ASX: BHP) shares all underperformed the 2.3% gains posted by the S&P/ASX 200 Index (ASX: XJO) in July.

Of the three ASX 200 mining stocks, only BHP managed to finish the month just past in the green.

On 30…