Quick Facts
| Location | Lunda Sul Province; -9.29°S, 20.36°E |
| Ownership | Endiama EP (Angola state) 59%, Taadeen Holdings (Oman sovereign wealth) 41% |
| Production | ~10 million carats annually; 35% gem quality; Angola produced record 14M carats in 2024 |
| Workforce | ~5,000+ |
| Primary Minerals | Diamonds |
| Corridor Connection | Lunda Sul Province; ~1,500km northeast of Lobito; separate from corridor route but significant Angola mining asset |
| Operator Website | www.endiama.co.ao |
Overview
The Catoca Diamond Mine is the fourth-largest diamond mine in the world and the largest in Angola, responsible for approximately 75% of the country's diamond output. Located on a massive kimberlite pipe covering 64 hectares near Saurimo in Lunda Sul Province, Catoca has been in production since 1997 and represents Angola's most significant non-petroleum mineral asset.
The mine's ownership underwent significant restructuring in 2024-2025 following international sanctions against Russia. Alrosa, the Russian state diamond company that held 41% of Catoca since the mine's inception, divested its stake. In May 2025, Taadeen Holdings, a subsidiary of Oman's sovereign wealth fund (Oman Investment Authority), replaced Alrosa as minority partner. Endiama, Angola's state diamond company, increased its stake to 59%, maintaining national control.
Catoca's diamonds are notably high quality: 35% gem quality compared to a global average of 20%, with an average value of USD 75-100 per carat. The mine's proven and probable reserves are estimated at 130 million carats with an expected mining life exceeding 30 years. The current open pit exceeds 200 metres depth, with plans to reach 600 metres by 2034.
Angola produced a record 14 million carats in 2024, becoming the world's third-largest diamond producer behind Russia and Botswana. The neighbouring Luele mine, also operated by Catoca with a 50.5% stake, commenced production in 2023 and is ramping up to full capacity. Together, Catoca and Luele accounted for 91% of Angola's diamond production in the first half of 2025. Angola targets 14.8 million carats for 2025.
Community Impact
Catoca employs thousands of workers and provides significant economic contribution to Lunda Sul Province. The mine operates a hydroelectric power plant on the Chicapa River that serves both the mine and the city of Saurimo.
However, the mine's environmental record includes a serious incident in July 2021 when waste material leaked into the Tshikapa River, a tributary flowing into the DRC. The contamination turned the river red, killed large numbers of fish, and according to DRC authorities, caused 12 deaths and sickened more than 4,000 people downstream. Independent testing found nickel and uranium contamination despite Catoca's claims that no heavy metals were involved. The DRC pursued monetary damages but resolution remained incomplete.
Environmental Profile
The 2021 Tshikapa River contamination event represents the most significant environmental incident in Catoca's history. European Space Agency Sentinel-2 satellite imagery confirmed the extensive water quality impact downstream. The incident highlighted the transboundary environmental risks of large-scale mining operations and the inadequacy of self-reporting by mining companies.
The mine's expansion to 600 metres depth will generate increasing volumes of waste material, heightening the importance of tailings management and water treatment infrastructure.
ESG Assessment
Status: Under Assessment
This mine has not yet received a formal Lobito Corridor ESG rating. Our assessment team is compiling baseline data from public sources, field observations, and stakeholder consultations. ESG ratings, when issued, will be verified through the source library.
Timeline
| Date | Event |
|---|---|
| 1965 | Kimberlite pipe discovered by Diamang |
| 1994 | Sociedade Mineira de Catoca joint venture formed |
| 1997 | First diamonds recovered from processing plant |
| 2005 | Processing capacity expanded to 10 million tonnes per annum |
| 2012 | Peak production of 6.7 million carats |
| 2021 | Tshikapa River contamination incident; DRC reports 12 deaths |
| 2024 | Taadeen (Oman) replaces sanctions-hit Alrosa as 41% shareholder |
| 2024 | Angola produces record 14 million carats |
| 2025 | Angola targets 14.8M carats; Catoca and Luele account for 91% of output |
Related Pages
This profile is produced independently by Lobito Corridor and does not represent the views of Sociedade Mineira de Catoca or any government. Data sourced from public filings, government reports, and independent research. Last updated: May 19, 2026.
Independent ESG Assessment
Our independent ESG assessment evaluates this operation's environmental management, social impact, governance quality, and disclosure transparency. Environmental assessment covers water management, waste handling, air emissions, biodiversity impacts, and mine closure planning. Social assessment examines community relations, employment practices, local procurement, benefit-sharing, and human rights performance. Governance assessment evaluates corporate transparency, anti-corruption measures, and stakeholder engagement quality.
Assessment findings are incorporated into our quarterly Corridor ESG Scorecards, providing stakeholders with comparable, independent ratings across all major corridor mining operations. Operations meeting our assessment thresholds are eligible for verified ESG ratings issued from our evidence archive — verifiable reputation signals that differentiate responsible operators from those whose ESG claims are unsubstantiated. Rating publication requires demonstrated performance, not just policy commitments.
Community Impact Monitoring
Community impact monitoring around this operation tracks the full spectrum of mining effects on surrounding populations. Employment and procurement spending quantify direct economic benefits to local communities. Environmental monitoring tracks water quality, air quality, and ecosystem health in areas affected by operations. Community consultation processes are evaluated for meaningful participation versus performative compliance. Grievance mechanisms are assessed for accessibility, responsiveness, and outcome fairness.
Our monitoring provides the independent verification that enables stakeholders — investors, regulators, civil society, and affected communities themselves — to assess whether this operation delivers the community benefits that its social licence to operate requires. Documentation is preserved on our source evidence archive, creating permanent records that support long-term accountability and prevent the revisionism that undermines community claims when corporate memory proves conveniently selective.
Labour Practices Assessment
Labour practices at this operation are assessed against both national labour law requirements and international standards including ILO conventions and the Voluntary Principles on Security and Human Rights. Our assessment covers wage levels and payment practices, working hours and overtime compensation, occupational health and safety conditions, freedom of association and collective bargaining, contract terms and employment security, and subcontractor labour standards. Subcontractor labour conditions receive particular attention as subcontracting relationships can create distance between the operating company and workers that enables standards erosion.
Our assessment includes worker consultation that captures perspectives not reflected in corporate compliance reporting. Workers face barriers to reporting concerns through company channels including fear of retaliation, distrust of management-controlled grievance mechanisms, and language barriers. Our independent worker consultation provides confidential channels through which labour concerns can be documented and, where appropriate, escalated through advocacy or referral to labour rights organisations. All worker consultation documentation is handled with strict confidentiality to protect worker anonymity and prevent retaliation.
Supply Chain and Market Position
This mine's position within global mineral supply chains determines the economic dynamics that shape its operational decisions and community impact. Copper and cobalt prices, processing locations, end-user industries, and supply-demand dynamics create the commercial context within which environmental and social management decisions are made. When commodity prices are high, operators may invest more in community development and environmental management; when prices fall, these investments face pressure. Our monitoring tracks the relationship between market conditions and ESG performance to assess whether responsible practices are maintained through market cycles or only during profitable periods.
The corridor's logistics infrastructure — railway capacity, port throughput, transport costs — directly affects this mine's export economics. Improved corridor logistics reduce transport costs, improving mine profitability and potentially creating space for increased community benefit-sharing. Conversely, logistics bottlenecks increase costs and reduce the economic surplus available for community investment. Our strategic analysis evaluates how corridor infrastructure development affects this mine's economics and, consequently, the resources available for community benefit and environmental management.