At least 37 people suspected of illegal mining have died while held at a detention facility run by Nigeria's civil defence corps in Niger State, a large, mineral-rich state in central Nigeria. The deaths, which occurred in the early hours of Thursday, prompted police to launch an investigation, triggered street protests in the state capital Minna, and drew expressions of grief from the state's governor.

The Nigeria Security and Civil Defence Corps (NSCDC), a paramilitary agency that works alongside police to protect public infrastructure and national assets, said it had rounded up scores of suspected illegal miners on Tuesday and Wednesday before discovering the deaths the following morning. The corps attributed the fatalities to a suspected disease outbreak, but an intelligence report reviewed by journalists pointed to a different cause: overcrowding and inadequate ventilation within the detention facility. A survivor gave a harrowing first-hand account to the Associated Press, describing how roughly 65 detainees were crammed into a poorly ventilated cell. "Suddenly we noticed we could no longer breathe and were pushing each other to get fresh air," he said, adding that prisoners banged on the cell door to alert guards. Bodies have been transferred to a hospital for an official determination of cause of death.

Governor Mohammed Umaru Bago, speaking at a press conference in Minna broadcast by Nigerian television, called the incident "so sad, so tragic" and announced three days of mourning. He also postponed the start of campaigning for elections scheduled for January and said a committee of inquiry had already begun its work. The deaths sparked protests by miners and their supporters in Minna, during which vehicles and other property were damaged.

The broader context is one of intense, often dangerous competition over Niger State's substantial mineral wealth. The state — more than twice the size of Belgium — sits atop deposits of gold, tantalite, copper, and lithium, the latter in growing global demand for electric vehicles and clean energy technologies. Thousands of artisanal miners work the area informally, many drawn by the prospect of finding gold. Criminal gangs, known locally as bandits, exploit this activity by taxing miners and demanding cuts from extracted ore. According to a 2024 report by the development organisation SwissAid, most illegally mined gold is smuggled to the United Arab Emirates, from where it enters the global supply chain reaching Europe, the United States, Asia, and South Africa.

The deaths raise urgent questions about detention conditions for those arrested in crackdowns on informal mining — a sector that, while technically illegal, provides livelihoods for large numbers of people across Nigeria and much of West Africa.