A miner smiles as he comes above ground after his shift at the Sima coal mine near the city of Changzhi, in China's west Shanxi province, May 9, 2006. The Sima coal mine produces about 10,000 tons of coal per day with around 1,300 employees.The Chinese government has vowed to close all small coal mines operating without proper safety standards in the next three years, Xinhua News Agency reported. REUTERS/Reinhard Krause