 RTT News | Rio Tinto approves $3.7 bln Australia iron ore expansion Reuters * Rio Tinto okays $3.7 bln to boost iron ore output 25 pct * Says mindful of short-term economic uncertainties * Faith in long-term demand from China for more ore * Also earmarks $501 mln for Simandou iron ore project in Guinea * Bingham Canyon copper ... Rio Tinto To Invest $4.2 Billion in Iron Ore, But Cautions on Spending Rio Tinto ramps up iron ore output Rio Tinto To Commit $4.2 Bln For Iron Ore Expansion |