This agreement between Burwill and subsidiary of China Minmetals may provide a clue.
China Minmetals Corporation is China’s largest and the world’s leading metal mineral conglomerate, ranking 120th in the world’s top 500 enterprises.
http://www.hkexnews.hk/listedco/listconews/SEHK/2018/0212/LTN20180212654.pdf