Our Burning Planet


Lesotho communities blame diamond mine pollution for trail of sickness, death and ‘poisoned pasture’ 

Lesotho communities blame diamond mine pollution for trail of sickness, death and ‘poisoned pasture’ 
Villager Mapontso Lematla explaining the real-time damage from Letšeng Diamond Mine into the stream in March this year. (Photo: Retselisitsoe Khabo)

Residents in Patising and Maloraneng live downstream from Letšeng Diamond Mine and rely on surrounding natural water sources for drinking and other household chores. They tell dark stories of blue and black water — toxic contamination they allege is caused by the mine.

Sitting in her modest hut in the rural enclave of Patising in Mokhotlong, Lesotho, the 52-year-old Mapontso Lematla says she first spotted the discoloured water in the local stream decades ago. 

“This water causes stomachaches and diarrhoea,” the soft-spoken Lematla said in an exclusive interview with MNN Centre for Investigative Journalism.  

Many residents in the Patising and Maloraneng communities, who live downstream from Letšeng Diamond Mine and rely on surrounding natural water sources for drinking and other household chores, tell stories of the blue and black water and believe this pollution is the cause of illness and death. 

Lematla describes how the Patising stream sometimes overflows with mine tailings (motoro in local language). 

The World Health Organization (WHO) says: “contaminated water and poor sanitation are linked to transmission of diseases such as diarrhoea…”

A Letšeng Diamond Mine dam upstream the Patising village. (Photo: Retselisitsoe Khabo)

‘The water is making us sick’

Clad in her purple blouse, dark sweater and white sunhat, Lematla says her Patising community is always battling diseases such as diarrhoea. She has lost count of how many times she’s fallen ill from drinking the contaminated water. 

“I am one person who has serious difficulties using this water; it upsets my system,” says Lematla who had diarrhoea and severe stomachache for two weeks between January and February this year. 

“I had diarrhoea for whole two weeks, constantly running to the toilet. We have discussed water contamination issues with Letšeng many times,” adds Lematla, who also explains that some residents living in the older residential side of Patising, Ka Lithakong, depend on the stream for daily water needs.

While the Letšeng Diamond Mine has constructed a borehole in the new village, for Lematla this is a ten-minute walk away.  

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She says accessing the borehole Letšeng constructed for Patising is not always easy for those staying at Ka Lithakong due to distance and sometimes, overflowing streams.  

Scared of being swept by the sometimes overflowing stream or running out of water at awkward times forces her and others to use the stream for drinking water. 

Sephapo Moletsane is a 72-year-old ex-miner-turned-unionist. Moletsane worked at Letšeng mine when it was owned by De Beers, a mining company that was asked by the Lesotho government to re-evaluate the Letšeng kimberlites in December 1976. It was later granted an eight-year mining lease.

“The contaminated water causes diarrhoea, a rash that I don’t know what name I can give to but there is that rash which forces people to scratch themselves, particularly small children. It also causes something similar to flu, people cough a lot, causing us to think that maybe they have tuberculosis,” Moletsane said.

Phase 2 of the Lesotho Highlands Water Project will be built at the confluence of the contaminated Khubelu (left) and Senqu rivers. This place will be submerged at the completion of this project. (Photo: Pascalinah Kabi)

In March this year, a Maloraneng father, Reboneng Matubatuba, blamed the death of his 13-year-old son on the mine. 

Matubatuba says his son, who was crippled shortly after his fifth birthday, succumbed to diarrhoea and sharp stomachache after inhaling polluted air coming from a Letšeng blasting operation.  

Matubatuba’s son inhaled the “odour from the smoke coming from Letšeng”. The next day, the deceased had diarrhoea that lasted for a month, leading to his death. 

“A dark emission came towards the village and an odour was smelled all over the place. He complained about the odour. The following day, he woke up with diarrhoea. 

“We thought this was the result of the smoke and the water since we drew it from the stream. The water was blue and salty. We didn’t have any access to clean water and depended on the stream water. I thought the smoke and the air were a cause of his sickness — the diarrhoea that went on until he died.

“He complained of a severe stomachache before he died. The suspicion is that the cause of his death is the smoke and the water from the stream,” Matubatuba said. 

A postmortem was not done as this is expensive and not something that is an option for poverty-stricken Patising and Maloraneng communities. 

In a statement to MNN, Letšeng Diamonds chief executive officer, Kelebone Leisanyane said: “Any suggestion of the company’s activities having adverse impacts on the health of the community members is baseless”. 

Maluti Community Development Forum (MCDF), an interest group that defends the rights of the poor communities in the Lesotho’s mining areas, claims there have been at least two deaths suspected to be associated with the water contamination in Patising and Maloraneng villages. 

“One of those incidents, in Maloraneng, concerns a one-year-old infant who died on the back of his grandmother while walking twelve kilometres to access public transport to health services,” reads a MCDF report. 

Leisanyane, however,  says that MCDF president Advocate Thabo Lerotholi “persists on making false and damaging allegations against the Company” instead of availing himself for a “constructive dialogue”.

Two years ago, 19 Patising villagers asked the Lesotho high court to order the Letšeng Diamond Mine to relocate them because they fear being engulfed by the mine’s slime dams in case of flooding. They also claimed the stream water was no longer safe for consumption. 

In response, Leisanyane told the high court that: “Letšeng’s investigations have disclosed that people from Patising use the water they collect over and over again. In the process, bacteria gets into the water. This in turn, after many uses, renders it unsafe for washing purposes”.

The MNN has since learnt that community members are divided on issues of water contamination, with others coming to the defence of Letšeng. 

Patising chief, Tseko Lematla says the mine last polluted the water early into the mine’s operations.  

“We reprimanded the mine harshly because that issue (water contamination) was happening at an alarming rate due to the carelessness from the slime dam. It is now a thing of the past,” Tseko said. 

Tseko’s statement, however, contradicts what is happening on the ground. For instance, just a few hours after the interview with Tseko, the MNN crew witnessed blue water from the Letšeng mine gushing into Feeane — one of the three streams originating from Letšeng Diamond Mine that flows into Khubelu River. 

Maloraneng subchief Lentsoete Mohai says there is no longer fish in this stream owing to water contamination by Letšeng Diamond Mine. (Photo: Pascalinah Kabi)

No more fish in the water

Maloraneng sub-chief, Lentsoete Mohai, says the contaminated water kills everything, from livestock to plantations, and fish. 

“Our association planted trees here,” Mohai said, adding “the dust (from the mine) left trails on the topsoil”. 

He thinks that, at that time, there was just too much of that blue dust in the environment affecting the ecosystem in the area. 

“When watering the trees, there would be a blue colour in the small hole made for the tree. The tree would then display undesirable results like its leaves drying up,” Mohai said. 

With the blue dust settling on grazing grass, Maloraneng livestock grazed from the “poisoned pasture”. Mohai says: “We don’t know what killed them (livestock) but one thinks they are dying from this thing because they never died before its arrival”. 

Before and shortly after the mine started its operations in 2004, Mohai claims there was plenty of fish in the Maloraneng stream which also helped feed the community. 

“We used to have lots of fishes and the mine (stocked) fishes for us at the beginning of its operations, big-sized, beautiful fishes similar to those (stocked) in the Katse Dam. 

“We used to catch plentiful fishes until the Letšeng mine started doing their operations resulting in this type of water, we no longer have fishes here. Those beautiful fishes have gone extinct. We have now learned that this polluted water is killing us,” Mohai said. Leisanyane denies these claims. 

Patising villagers say polluted water makes them sick. (Photo: Retselisitsoe Khabo)

Contamination spills into Lesotho, SA water project

Patising and Maloraneng streams feed into the Khubelu River, one of the two critical rivers feeding in Phase II of the Lesotho Highlands Water Project (LHWP) in Mokhotlong. 

According to University of Dar es Salaam Master’s graduate, Masetsabelo Moqekela, the Khubelu wetlands are also vital for the sustainability of this Phase II project.

LHWP is a multi-phased binational project providing water to Gauteng, South Africa while generating hydroelectricity for Lesotho. Phase II of the project, Polihali Dam, will be built at the confluence of Khubelu and Senqu rivers in Mokhotlong. 

In 2016, Moqekela undertook a study evaluating the monetary value of the Khubelu Wetlands. 

In an interview with MNN, Moqekela said: “Human activities like mining pose a threat of pollution and destruction to the wetland”.  

She estimates that the Khubelu wetlands, fast degrading, value M7.6-million, 58% of the M12.8-billion Lesotho got from selling 17,503 million cubic metres of water to South Africa between 1996 and 2021. 

Failure to rehabilitate these wetlands could mean that: “Both the quality and quantity of water (in Polihali Dam) will be affected”, according to Moqekela.  

Cape Peninsula University of Technology student, Bokang Shakhane says: “The results obtained in the present study indicated that there was a definite pollution in the Khubelu River Catchment with respect to (heavy metals) HMs and nutrients studied”. 

Leisanyane told MNN that the mine is not “getting into these research-related questions because we do not have time, they are highly academic”. 

South African High Commissioner Sello Moloto appealed to the Lesotho government about the contamination of water by mining activities at Polihali, about four years ago. 

“The continuing issuing of mining licenses within the environmentally sensitive areas of the dams poses a danger of environmental degradation and ultimately the contamination of water,” Moloto said. DM/OBP

Pascalinah Kabi is a Bertha Foundation Fellow.  


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