Rubaya, North Kivu: The Mine That Feeds Tesla's Battery. The Children Who Work It.

The boy is perhaps eleven, perhaps thirteen—it is hard to tell when a child has been working underground for years. His name is Emmanuel. He carries a sack of coltan ore that weighs nearly as much as he does, climbing out of a pit forty meters deep with no ladder, only footholds carved into red earth that crumbles under his bare feet. He makes this climb sixteen times a day. He earns two dollars.

This is Rubaya, North Kivu province, Democratic Republic of Congo, April 2026. The hillsides are honeycombed with artisanal mines—pits dug by hand, worked by men and boys with shovels and buckets. The ore they extract is columbite-tantalite, known as coltan. Refined, it becomes tantalum, a metal essential to capacitors in smartphones, laptops, electric vehicles, and military hardware. Without tantalum, the global electronics industry stops.

Emmanuel does not know this. He knows the Chinese buyers pay cash for full sacks. He knows the men with Kalashnikovs take a share before the sacks reach the buyers. He knows his mother needs the money because his father was killed two years ago when a tunnel collapsed in a cassiterite mine fifteen kilometers from here.

Who Controls the Ore

Rubaya's coltan mines are not controlled by the Congolese government. They are controlled by the M23 rebel group, which has held territory across North Kivu since resuming military operations in November 2021. M23—Mouvement du 23 Mars—is a predominantly Tutsi militia that the United Nations Group of Experts has repeatedly documented as receiving support from the Rwandan Defence Force, including weapons, ammunition, and officer-level personnel.

Rwanda denies this. President Paul Kagame has called the allegations "a narrative designed to obscure DRC's internal failures." But the UN Group of Experts, in its December 2025 report to the Security Council, presented satellite imagery, intercepted communications, and testimony from captured M23 fighters identifying Rwandan officers by name. The report named Colonel Richard Kanyingi and Major Alexandre Mugabo as operational commanders embedded with M23 units in the Rubaya mining zone.

M23 taxes every kilogram of coltan leaving Rubaya. Miners pay to enter the pits. Diggers pay a percentage of what they extract. Transporters pay roadblock fees. The armed groups running eastern Congo's mineral economy operate as de facto states: they collect revenue, enforce contracts, and eliminate competitors. In Rubaya, this system generates an estimated $800,000 per month in coltan revenue alone, according to analysis by the Congo Research Group at New York University.

The Supply Chain to Kigali

The ore Emmanuel carries out of the pit travels north. It is bought in Rubaya by Congolese traders, who sell to larger brokers in Goma, the provincial capital. From Goma it crosses into Rwanda, typically through the Rubavu border post. Once in Rwanda, the coltan is processed, rebagged, and exported with Rwandan certificates of origin.

Rwanda produces almost no coltan domestically. Its geology is not suited to tantalum-rich deposits. Yet Rwanda is the world's fifth-largest exporter of tantalum ore, according to the U.S. Geological Survey. In 2024, Rwanda exported 710 metric tonnes of tantalum concentrates, worth approximately $42 million. Nearly all of it originated in eastern DRC.

The tantalum reaches global markets through processing plants in China, primarily operated by Ningxia Orient Tantalum Industry and Guangdong Rising Tantalum Industry. These firms refine the ore into tantalum powder and capacitor-grade metal, which is sold to component manufacturers supplying Samsung, Apple, Tesla, Panasonic, and dozens of other technology and automotive companies.

What the Companies Say

Apple publishes an annual Supplier Responsibility Progress Report. The 2025 edition states that the company "does not directly source minerals" but requires its suppliers to conduct due diligence under the OECD framework. It lists 38 tantalum smelters in its supply chain that have been validated by the Responsible Minerals Initiative, an industry-funded audit program.

Tesla's 2025 Impact Report states that the company is "committed to responsible sourcing" and requires its battery suppliers to source cobalt and other minerals only from "conflict-free" operations. It does not publish a full list of tantalum suppliers.

The Responsible Minerals Initiative audits smelters, not mines. It certifies that a processing facility in China has "adequate procedures" for tracking the origin of ore. It does not send auditors into Rubaya. It does not verify whether the ore came from a government-controlled mine or a militia-controlled pit. It accepts Rwandan export documentation at face value.

Cobalt: A Parallel Economy

Three hundred kilometers south, in Haut-Katanga and Lualaba provinces, the mineral is cobalt. The stakes are higher. Congo holds 48% of the world's cobalt reserves. Cobalt is essential to lithium-ion batteries—the kind that power electric vehicles and grid-scale energy storage. Without Congolese cobalt, the global energy transition does not happen at its current pace.

Most cobalt is extracted by industrial-scale mining operations run by Glencore and China Molybdenum Company (CMOC). But an estimated 15-20% of Congolese cobalt comes from artisanal and small-scale mining—hand-dug pits where safety standards are nonexistent and child labour is pervasive. Amnesty International documented children as young as seven working in artisanal cobalt mines in Kolwezi district in its 2023 and 2024 field investigations.

The artisanal cobalt is sold to traders who sell to processing facilities, most of them Chinese-owned. Congo-DongFang Mining (CDM), a subsidiary of China's Zhejiang Huayou Cobalt, operates cobalt processing plants in Kolwezi. The refined cobalt is shipped to China, where it is manufactured into battery cathodes by companies including CATL, BYD, and LG Energy Solution. Those batteries go into vehicles made by Tesla, Volkswagen, General Motors, and Ford.

Huayou Cobalt, after sustained pressure from human rights organizations, committed in 2020 to end purchases from artisanal mines where child labour could not be ruled out. In 2024, an investigation by the Lowwy Institute documented continued purchases of artisanal cobalt by CDM from suppliers in Kolwezi operating unregistered mining sites. Huayou disputed the findings but did not release supply chain documentation.

The Legal Framework That Does Not Function

The United States tried to fix this. Section 1502 of the Dodd-Frank Act, passed in 2010, required U.S.-listed companies to disclose whether their products contain "conflict minerals" from the DRC or adjoining countries. The law was intended to cut funding to armed groups by forcing supply chain transparency.

It did not work. The law created an entire audit industry—the Responsible Minerals Initiative, the International Conference on the Great Lakes Region certification scheme, the OECD Due Diligence Guidance—but it did not stop the flow of minerals from militia-controlled zones. It displaced it. Traders became more sophisticated. Armed groups laundered ore through Rwanda, Uganda, and Burundi. Companies hired consultants to produce compliance reports. The mining continued.

The European Union's Conflict Minerals Regulation came into force in 2021, modeled on Dodd-Frank. It requires EU importers of tin, tantalum, tungsten, and gold to exercise due diligence. But like Dodd-Frank, it relies on self-reporting and third-party audits. Enforcement is minimal. Between 2021 and 2025, the EU issued zero penalties for violations.

What Nobody Is Saying

The international community knows all this. The UN has documented it for fifteen years. Human Rights Watch has documented it. Amnesty International has documented it. Investigative journalists have traced the supply chains, interviewed the miners, photographed the children.

Nothing changes because the incentives do not align. Rwanda profits from its position as the laundromat. Chinese processors profit from cheap ore. Technology companies profit from compliant suppliers who provide clean audit reports. Western governments profit from stable relations with Kigali, which they consider a strategic partner in a volatile region.

The Congolese government lacks the capacity and, in many cases, the will to enforce its own mining laws. Provincial officials in North Kivu and Lualaba profit from the informal mineral trade. Military officers operate their own mining rackets. The Ministry of Mines in Kinshasa issues decrees that are ignored three hundred kilometers away.

This correspondent has covered eastern Congo on and off since 2012. The mines look the same. The armed groups have different names—CNDP became M23, FDLR splinters and regroups, Nyatura factions merge and split—but the fundamental economy has not changed. Boys dig. Men with guns tax them. Traders move the ore across borders. Smelters in China process it. Technology companies buy it.

What Will Happen

Emmanuel will keep digging until the tunnel collapses or his lungs give out or he earns enough to leave, which he will not. The M23 will keep taxing the ore until a rival militia takes Rubaya, at which point the new militia will impose the same taxes. Rwanda will keep exporting tantalum it does not produce. Chinese processors will keep refining it. Apple and Tesla and Samsung will keep publishing sustainability reports that say they have "zero tolerance" for conflict minerals.

The UN Group of Experts will issue another report. The Security Council will hold another session. No sanctions will be imposed on Rwanda because Rwanda is considered too strategically important. No technology company will face meaningful penalties because the audit system provides legal cover. No mining company will lose its license because the Congolese state cannot enforce its own laws in its own territory.

The system works exactly as it is designed to work. It extracts maximum value from Congolese minerals while distributing minimum risk to the buyers. It allows technology companies to claim ethical sourcing while avoiding the cost and complexity of actually verifying mine-level origin. It allows Rwanda to profit from war while maintaining its reputation as a development success story. It allows China to secure the raw materials for its battery industry without diplomatic complications.

And Emmanuel keeps climbing out of the pit, sixteen times a day, carrying ore that will end up in a device you are probably holding right now.