A Chinese miner walks past a coal heap outside a mine near Datong in this February 22, 2005 file photo. Chinese coal miners are raising spot prices in a domestic market struggling to recover from seven-year lows, desperate for an edge in annual negotiations to supply power plants, key buyers in the world's biggest consumer of coal, industry sources say. REUTERS/Reinhard Krause/Files (CHINA - Tags: BUSINESS ENERGY)
A Chinese miner walks past a coal heap outside a mine near Datong in this February 22, 2005 file photo. Chinese coal miners are raising spot prices in a domestic market struggling to recover from seven-year lows, desperate for an edge in annual negotiations to supply power plants, key buyers in the world's biggest consumer of coal, industry sources say. REUTERS/Reinhard Krause/Files (CHINA - Tags: BUSINESS ENERGY)