Zambia’s $80 Billion Lawsuit Over Copper Mine Dam Collapse

Zambia’s $80 billion lawsuit over the copper mine dam collapse is a constitutional petition filed in September 2025 by 177 farmers in the High Court in Lusaka against Sino Metals Leach Zambia and NFC Africa Mining, two Chinese state-linked subsidiaries blamed for a February 2025 tailings dam failure that poured acidic waste into the Kafue River system. The plaintiffs want $80 billion placed in a government-managed fund for environmental remediation and compensation, plus $20 million for emergency health and environmental relief.¹ As of mid-2026 the case is pending before Zambia’s Supreme Court, which has ordered the Zambian government to be joined as a party before the appeal can proceed.²

What Happened at the Dam

On February 18, 2025, a tailings storage facility at Sino Metals’ operation near Chambishi, in the Copperbelt, failed. Acidic slurry overtopped and breached successive compartments and then flowed into the Chambishi Stream, the Mwambashi River, and downstream reaches of the Kafue, which supplies drinking water to around five million Zambians, including residents of Lusaka.³⁴

How much was released is contested. Sino Metals initially put the figure at roughly 50,000 cubic meters.⁵ Drizit Environmental, a South African firm hired to assess the spill independently, concluded that more than 1.5 million tons of toxic material had been released — roughly 30 times the company’s figure — after analyzing over 3,500 samples that showed dangerous levels of cyanide, arsenic, copper, zinc, lead, chromium, cadmium, and uranium in soil and riverbanks. Sino Metals fired Drizit one day before its final report was due, citing a “contractual dispute,” and formally disputed the findings.⁶ Testing by the Embassy of Finland in July 2025 detected 24 heavy metals in the Mwambashi Stream and the Kafue River, with 16 exceeding World Health Organization thresholds at points nearly 100 kilometers downstream.⁴

Who Was Harmed

The spill tore through subsistence farming communities around Kitwe and Chambishi. Fish died off. Maize, tomatoes, onions, cabbage, and other crops were flooded with acidic water and had to be abandoned or burned. Village wells became undrinkable, and cattle, goats, and poultry died after drinking contaminated water.⁷¹⁸

Residents reported headaches, coughs, diarrhea, muscle cramps, skin sores, chest tightness, and blood in their urine.⁹ A leaked consultant’s report warned of risks of “birth defects, cancers, liver and lung disease, heart conditions” in affected areas.¹⁰ A government-commissioned health risk assessment found the Kafue itself diluted the contamination at distance, but that vegetables grown in contaminated soil had accumulated heavy metals at levels posing cancer and non-cancer health risks. The assessment recommended the immediate relocation of residents in Kalusale.¹¹

A study in Nature found that within a month of the collapse, household income losses ranged from 200 to 70,000 kwacha, with a median of about 15,000 kwacha (roughly $525).⁸

Inside the Lawsuit

The petition is docketed as Cause No. 2025/HP/1285. The 177 named residents are backed by the Southern Africa Litigation Centre and say they represent roughly 300,000 households in the Copperbelt who depend on farming.²¹ Both defendants are subsidiaries of Chinese state-owned firms, with Sino Metals linked to the China Nonferrous Metal Mining Group.¹⁰

The suit alleges that the dam failed because of engineering flaws, construction defects, and operational mismanagement, violating the plaintiffs’ constitutional right to a clean environment and destroying their livelihoods. It also alleges the companies failed to warn residents, leaving them to live in a contaminated environment for months.¹²

The $80 billion exceeds Zambia’s entire GDP. The plaintiffs frame it as the long-term cost of cleaning up a toxic watershed that serves millions, to be held in a government-managed account for remediation and compensation. The additional $20 million would seed an emergency fund for immediate health and environmental relief.¹ China Nonferrous Mining, Sino Metals’ Hong Kong–listed parent, has called the lawsuit “unfounded,” denied any “significant impact” on the environment, and said it has “fully fulfilled its restoration and remediation obligations.”¹⁰

Other Claims Running in Parallel

The $80 billion petition is not the only legal action. Malisa & Partners sent a formal demand in late August 2025 on behalf of 47 households, seeking $220 million in interim compensation plus $9.7 billion for a “Victims and Environmental Compensation and Rehabilitation Fund.”⁶ Malambo & Co., representing several Kalusale residents, sought $200 million for an emergency fund.¹³ Together, the various actions seek over $90 billion in long-term funds plus hundreds of millions in immediate relief.

The Settlement Agreements Controversy

While litigation moved forward, Sino Metals began paying some residents directly. In July 2025 the Zambian government ordered interim compensation for 454 farmers, and the company issued payments ranging from $17 to $2,000.⁴ By September 2025 Sino Metals said it had paid about $748,000, although community members told reporters they had “never seen the money.”¹⁴

According to the law firm Leigh Day, 27 petitioners signed agreements in July 2025 that included payments as low as $100 in exchange for waiving all rights to legal action, along with non-disclosure clauses and a promise never to speak about the spill. Some were reportedly signed in the presence of police and without independent legal advice.¹⁵ The lawsuit separately alleges Sino Metals coerced residents by claiming to monitor them with drones and asserting their phones had been tapped by Zambia’s telecommunications authority.¹⁰ The validity of those agreements is being challenged under the doctrine of unconscionable bargains.

How the Case Has Moved Through the Courts

Sino Metals tried to have the petition thrown out. In November 2025 the High Court rejected the company’s application to dismiss, letting the claims proceed. Sino Metals appealed on April 6, 2026 (Appeal No. 8/2026).²

On June 3, 2026, the Supreme Court in Kabwe heard the appeal. Instead of ruling on the merits, it directed that the Government of Zambia be joined as a party before the appeal could continue, observing that environmental harm from mining can remain hidden for a decade or more and that the government’s involvement as “custodian of the public interest” was essential. The case remains pending while the government is formally added.¹⁵

The Government’s Position

Copper mining accounts for roughly 72% of Zambia’s export earnings and up to 44% of government revenue, and the government has set a target of raising annual copper output from around 800,000 metric tons to 3 million by 2031–2032.¹⁶¹⁷ That reliance on Chinese investment has shaped the response.

The Zambia Environmental Management Agency suspended Sino Metals’ operations after the spill, issued an Environmental Restoration Order, and fined the company 1.5 million kwacha, which it paid in full. Critics have called the fine trivial given the scale of damage.⁵ By early 2026, the government said investigations had concluded and an independent environmental consultant had submitted findings to ZEMA.¹⁸

At the same time, officials downplayed the severity. At an August 2025 press conference, government spokesperson Cornelius Mweetwa said there was “absolutely no need to press the ‘panic button'” and that water quality had returned to normal. One day earlier, on August 6, 2025, the U.S. embassy had ordered the evacuation of all American government personnel from the Kitwe area, citing “hazardous and carcinogenic substances.”¹⁹ Sino Metals accused the U.S. of politicizing the spill.¹⁰

By June 2026, ZEMA had authorized the resumption of operations at the Sino Metals processing plant and the company was preparing to restart within months, while affected residents in Kalusale remained without farmland or clean water. The company has described those residents as “illegal settlers” on mine land.¹⁴

What the Earlier Mining Cases Established

Zambian communities have sued mining operators before. In 2015, 1,826 villagers from Chingola filed suit in the UK High Court against Vedanta Resources and its subsidiary Konkola Copper Mines, alleging toxic runoff from the Nchanga mine had contaminated water supplies and farmland since at least 2004.²⁰ Vedanta argued the case belonged in Zambia; the villagers said they could not get justice there. In April 2019 the UK Supreme Court held that English courts had jurisdiction, setting a precedent for holding multinational parent companies answerable for the conduct of overseas subsidiaries.²¹ The case was settled in January 2021, without an admission of liability, on behalf of more than 2,500 villagers.

Earlier still, in 2011 the Lusaka High Court ordered Konkola Copper Mines to pay $2 million in damages after finding it had discharged untreated toxic waste into the Mushishima River.²² One difference in the Sino Metals case: it is being pursued inside Zambia, under the country’s constitutional right to a clean environment, rather than in a foreign court.

Where Things Stand

The $80 billion lawsuit remains active, with the Supreme Court having ordered the Zambian government to join before the appeal moves forward. Sino Metals has admitted responsibility for the spill and issued a public apology, while characterizing the lawsuit’s demands as unfounded and the environmental damage as limited.¹³ Total compensation payments stood at roughly 14 million kwacha (about $592,000), which community groups and the Catholic charity Caritas Zambia have called “a drop in the ocean.”⁷ Residents in Kalusale remain displaced from their farmland without a sustainable water source as the company prepares to restart operations.¹⁴

1
BBC News. Zambian Farmers File $80bn Lawsuit Over Mine Pollution
2
Makanday. Chinese Mining Firm Faces Supreme Court Test Over Zambia Toxic Spill
3
EOS. Chambishi TSF Failure
4
ADF Magazine. Zambia Still Grappling With Impact of Chinese Mining Disaster
5
Government of Zambia Ministry of Water Development and Sanitation. Ministerial Statement on the Sino Metals Spillage
6
InsideClimate News. China Sino Metals Zambia Toxic Spill
7
Dialogue Earth. The Communities Paying the Price for Zambia’s Toxic Mining Disaster
8
Nature. Tailings Dam Collapse at a Chinese-Owned Copper Mine in Zambia
9
Human Rights Watch. Zambia Acid Spill Jeopardizes Residents Health
10
InsideClimate News. Chinese Mining Firm Downplays Toxic Waste Spill in Zambia
11
Zambia Environmental Management Agency. Health Risk Assessment Report
12
South China Morning Post. Lawsuit Targeting Chinese Mining Companies Poses Dilemma for Zambian Government
13
China Global South. Zambia Sino Metals Environmental Lawsuits
14
The Africa Report. Zambia Farmers Still Awaiting Compensation a Year After Sino Metals Mine Spill
15
Leigh Day. Zambia’s Toxic Spill Settlement Agreements in the Aftermath of Environmental Disasters
16
EITI. Zambia Country Page
17
Deutsche Welle. Zambians Pay Price Amid Copperbelt Mining Boom
18
Government of Zambia Ministry of Mines and Minerals Development. Update on Sino Metals Spillage Investigations
19
BBC News. US Embassy Issues Health Alert Over Zambia Mine Disaster
20
ActionAid. ActionAid Zambia Mining Companies Must Not Be Allowed to Pollute With Impunity
21
IISD. Zambian Villagers Win Right to Sue Mining Company in United Kingdom
22
EJIL Talk. Critical Minerals Environmental Harm and the Kafue River Spill in Zambia