Shenzhen Zhongjin Lingnan Nonfemet…suspended output at its Shaoguan smelter after authorities found that excessive levels of thallium were discharged by the plant into a river…The effects of the toxic spill into the Beijiang River have been controlled and measures have been taken to ensure the safety of drinking water, the company said…Thallium is a highly toxic byproduct metal collected in residues from smelting copper, zinc and lead ores…[Also refers to Zijin Mining Group]