Yunnan Tin Group Company Limited is the largest tin producer and exporter in China and the world. It is headquartered in Kunming, Yunnan. It involves in the production, processing and export of tin metal, and also for the production of tin-based and arsenic-based chemicals. It was established in 1883 by the Government of Qing Dynasty as the Gejiu Manufacture & Commercial Bureau. It owns two listed subsidiaries, Yunnan Tin Company Limited and Sino-Platinum Metals Company Limited. It was established in 1998 and listed on the Shenzhen Stock Exchange in 2000. It is the only stock company in the Chinese tin industry. In 2016, China Construction Bank, a major Chinese lender, entered into a debt-for-equity swap agreement with Yunnan Tin Group. This deal was valued at nearly 5 billion yuan. Wikipedia