"The new Morningstar review PDF of RIO which I received is quite interesting. They have given Rio a 5 star rating. They have set fair value at $23.00 and rate it a sell at $ 46.00 because of a more tempered outlook for iron ore prices, which they expect to ease from recent highs."
Morningstar is always after the thought. They are poor predictors. Morningstar will miss the turnaround and then after the fact raise their fair value. However, the market is usually 6 months ahead of actual results. Morningstar's fair value is a poor predictor of future stock performance.