On a daily chart, it appears as though RIO has broken a head and shoulders pattern. That takes us to about $62 if we extrapolate out a target. Alternatively, if we view RIO as now pulling back in 3 waves from its high on 12 August, where the "c" leg is 1.6 times the size of the "a" leg, then that also takes us to about $62.
So $62 appears to be a good short term support level for the share price of RIO.