Zambia's government says it will seek more compensation for communities affected by a toxic spill from a Chinese-owned copper mine, if this is needed following a full assessment. The spill of highly acidic mine-waste laden with toxic heavy metals happened in February when a dam that held waste from the Sino-Metals Leach Zambia copper mine collapsed, polluting a key river that is a major source of drinking water. The firm apologised and pledged to compensate the victims but Zambia's Vice-President Mutale Nalumango says that 'may not be all', adding that the safety of Zambians was 'non-negotiable'. Some embassies have warned their citizens to avoid the area due to the health risks. Sino-Metals Leach Zambia mine is a subsidiary of China Nonferrous Metal Mining Group, which is owned by the Chinese government. The company had initially reported that only 50,000 tonnes of waste material had spilled into waterways that connect to the Kafue River, near the northern city of Kitwe. But a South Africa-based environmental company, contracted by Sino-Metals to investigate the extent of the spill, found that the disaster resulted in the release of 1.5 million tonnes of toxic material. After its two-month investigation, Drizit company said approximately 900,000 cubic metres of toxic tailings were still present in the environment. These materials were found to contain dangerous levels of cyanide, arsenic, copper, zinc, lead, chromium, cadmium, and other pollutants posing significant long-term health risks, including organ damage, birth defects, and cancer, according to the report. The US embassy also issued a health alert, ordering the immediate withdrawal of its personnel in Kitwe town and nearby areas due to concerns of 'widespread contamination of water and soil'. However, Zambia's government downplayed the threat, saying there were no longer any serious implications for public health. Authorities have since imposed a fishing ban on the Kafue River and deployed the air force and speedboats to drop lime to reduce acidity levels in the affected waterways.