Greentech Technology International Limited, an investment holding company, engages in the exploration, development, and mining of tin and copper bearing ores in Australia. It holds 50% interests in the Renison underground mine comprising Renison Bell mine, concentrator, and infrastructure; the Mount Bischoff open cut tin project; and the Renison tailings retreatment project located in Tasmania. The company was formerly known as L'sea Resources International Holdings Limited and changed its name to Greentech Technology International Limited in October 2017.

Greentech Technology International Limited was incorporated in 2008 and is based in Tsim Sha Tsui, Hong Kong.