A woman walks past make-shift homes located near chimney stacks from a power station on the outskirts of the Mongolian capital city of Ulan Bator April 6, 2012. Mongolia is expected to be one of the world's fastest-growing economies over the next decade as a result of a mining boom and billions of dollars in foreign investment. REUTERS/David Gray (MONGOLIA - Tags: BUSINESS ENERGY COMMODITIES SOCIETY)