Has China's largest reserve of strontium (China has the world's 2nd biggest strontium deposit). Manganese is mined in the Xiushan area. Although the mining sector has been denounced as heavily polluting and unsafe.[89] Chongqing is also planned to be the site of a 10 million ton capacity refinery operated by CNPC (parent company of PetroChina) to process imported crude oil from the Sino-Burma pipelines.