Luacano-Jimbe Branch Line — Unlocking Angola's Diamond and Rare Earth Deposits

Branch Line Overview

The Luacano-Jimbe branch line is a proposed railway spur that would extend northward from the Benguela Railway mainline at Luacano, in Angola's Moxico Province, into the diamond- and mineral-rich Lunda provinces of the country's northeast. The branch represents one of the most strategically significant expansion options for the Lobito Corridor, connecting some of Africa's most valuable mineral deposits — including the world's fourth-largest diamond mine and one of the continent's most advanced rare earth projects — to an Atlantic export route for the first time.

At present, Angola's Lunda Norte and Lunda Sul provinces are among the most economically productive yet infrastructurally isolated regions on the African continent. The Lunda provinces account for the vast majority of Angola's diamond output, which reached a record 14 million carats in 2024, making Angola the world's fourth-largest diamond producer by value. Yet the region has no railway connection whatsoever. Diamonds, along with every other commodity produced in the Lundas, must travel by road — over hundreds of kilometres of poorly maintained laterite and gravel tracks that become impassable during the rainy season from October to April. This isolation adds enormous cost, limits the scale of extractive operations, and effectively prevents the development of bulkier mineral resources such as iron ore that cannot bear high road transport costs.

The Luacano-Jimbe branch would solve this problem by extending approximately 550 to 600 kilometres of new-build railway from Luacano junction northward through Lunda Sul and into Lunda Norte, terminating at or near Jimbe. This would place the Catoca diamond mine, the Lulo alluvial diamond concession, multiple kimberlite exploration targets, and significant iron ore deposits within the corridor's catchment area. When combined with the Longonjo rare earth project near Huambo on the existing Benguela mainline, the branch line would transform the Lobito Corridor from a predominantly copper-cobalt transit route into a multi-mineral logistics system of continental importance.

The branch line concept has been included in Angolan national transport planning documents since at least 2018 and has received renewed attention as the Lobito Corridor attracts international investment. Endiama, Angola's state diamond company, has expressed support for the project, as have several international mining firms with exploration concessions in the Lunda provinces. However, the branch remains in the conceptual and pre-feasibility stage, with no construction timeline formally announced and significant engineering, financing, and institutional challenges to overcome before ground is broken.

Proposed Route

The Luacano-Jimbe branch line would originate at Luacano, a station on the existing Benguela Railway mainline located in the eastern reaches of Moxico Province, approximately 1,100 kilometres from the Port of Lobito. Luacano sits on the high plateau of eastern Angola at an elevation of approximately 1,200 metres and currently serves as a passing point on the mainline between Luena and the border town of Luau. The junction would require the construction of marshalling yards, switching infrastructure, and potentially a small logistics platform to manage the interchange of freight between the branch and mainline services.

From Luacano, the proposed route runs generally north-northeast, descending from the Moxico plateau into the drainage basin of the Kasai River system. The line would cross several significant watercourses, including tributaries of the Chicapa and Luachimo rivers, requiring substantial bridge construction. The terrain transitions from the relatively open miombo woodland of the central plateau to denser gallery forests along river valleys and eventually to the savanna-woodland mosaic of the Lunda provinces.

Key Waypoints

While detailed route engineering has not been published, the alignment would logically pass through or near several strategically important locations:

• Saurimo — The provincial capital of Lunda Sul, with a population of approximately 200,000 and the administrative centre for Angola's diamond industry. Saurimo has an airport capable of receiving medium-sized aircraft, a modest road network, and serves as the regional hub for Endiama's operations. A rail connection to Saurimo alone would transform the logistics economics of the entire Lunda Sul province.
• Catoca — Located approximately 35 kilometres from Saurimo, the Catoca kimberlite pipe is the world's fourth-largest diamond mine by output and Angola's single most valuable mining asset. A spur or siding connecting Catoca to the branch line would provide the mine's first rail access, enabling the transport of heavy mining equipment, fuel, consumables, and potentially bulk mineral exports at dramatically lower cost than current road transport.
• Lucapa area — Farther north in Lunda Norte, the Lucapa area hosts alluvial and kimberlite diamond deposits, including the Lulo concession operated by Lucapa Diamond Company in partnership with Endiama. The Lulo concession has produced several of the largest diamonds found anywhere in the world in recent years, including stones exceeding 400 carats.
• Jimbe — The proposed northern terminus, located in Lunda Norte Province. Jimbe lies in a zone of known iron ore deposits and is positioned to serve as a collection point for minerals from across the northern Lunda region. The choice of Jimbe as terminus reflects both the mineral potential of the area and the practical engineering consideration that extending the line farther north into the dense tropical forest of the Congo Basin would exponentially increase construction costs.

Route Summary

The entire branch would be built to Cape gauge (1,067 mm), matching the Benguela mainline and the broader southern African rail network. This ensures interoperability with existing rolling stock and avoids the expense and complexity of gauge-change facilities at the junction. Design specifications would likely call for 30-tonne axle loads to accommodate mineral freight, moderate gradients not exceeding 1.5 percent to manage the plateau-to-valley descent, and passing loops at regular intervals to allow bidirectional traffic on what would initially be a single-track line.

Mineral Deposits Served

The economic justification for the Luacano-Jimbe branch rests on the extraordinary mineral wealth of the Lunda provinces and, more broadly, the eastern Angolan interior. The branch would serve three distinct categories of mineral resource: diamonds, rare earth elements, and iron ore. Each has different logistics requirements, market dynamics, and development timelines, but together they create a compelling multi-commodity case for the railway investment.

Mineral Deposits Overview

The table above illustrates the diversity of mineral resources that would fall within the branch line's catchment area. However, three commodities — diamonds, rare earths, and iron ore — dominate the economic case and deserve individual analysis.

Diamond Mining Connections

Angola is one of the world's most important diamond producers, ranking fourth globally by value and fifth by volume. The country's diamond output is overwhelmingly concentrated in the Lunda provinces, where a geological formation known as the Kasai Shield hosts dozens of kimberlite pipes and extensive alluvial deposits spread across river systems draining northward into the Congo Basin. The Luacano-Jimbe branch would, for the first time, connect this diamond-producing heartland to a modern railway.

Catoca Diamond Mine

The Catoca kimberlite pipe, located approximately 35 kilometres from Saurimo in Lunda Sul, is the anchor mining asset for the branch line. Catoca is the world's fourth-largest diamond mine by output, producing approximately 10 million carats annually, of which roughly 35 percent are gem quality. The mine has been in continuous operation since 1997, having survived the final years of Angola's civil war, and represents Angola's single most valuable non-petroleum mining asset.

Catoca is operated by Sociedade Mineira de Catoca, a joint venture between Endiama (the Angolan state diamond company, holding 41 percent), Alrosa (the Russian state diamond producer, holding 41 percent), LL International (a Chinese entity, holding 18 percent), and Odebrecht (a Brazilian construction firm, nominal stake). The Alrosa shareholding has become a subject of international scrutiny following Western sanctions on Russian entities after 2022, though Angolan authorities have maintained that Catoca's operations are not directly affected by the sanctions regime. Endiama's position as the largest shareholder and the Angolan government's strategic interest in maximizing diamond revenue make Catoca a natural champion of any infrastructure project that reduces its operating costs.

Currently, all supplies entering Catoca — including heavy mining equipment, fuel, explosives, spare parts, food, and construction materials — arrive by road from Saurimo, which is itself supplied by road from Luena or by air. The mine's diesel fuel, consumed in vast quantities by haul trucks and processing equipment, travels overland from Lobito or Luanda in tanker trucks across hundreds of kilometres of deteriorating roads. This logistics chain is expensive, unreliable, and imposes a hard ceiling on the scale of operations. A rail connection would reduce the cost of inbound supplies by an estimated 40 to 60 percent and dramatically improve supply chain reliability, particularly during the rainy season when roads become impassable for heavy vehicles.

Diamond output itself is lightweight and high-value, meaning the branch line's freight revenue from outbound diamond shipments would be modest. The real economic benefit for Catoca lies in the reduction of inbound logistics costs and the ability to sustain and expand operations that would otherwise be constrained by the limits of road-dependent supply chains.

Lulo Alluvial Diamond Concession

The Lulo concession, located in Lunda Norte along the Cacuilo River, is one of the world's most remarkable alluvial diamond deposits. Operated by Lucapa Diamond Company in partnership with Endiama (holding 32 percent) and Rosas & Pétalas (a private Angolan entity, holding 6 percent), Lulo has consistently produced exceptional stones. Multiple diamonds exceeding 100 carats have been recovered from the concession, including several stones exceeding 400 carats that rank among the largest gem-quality diamonds found anywhere in the 21st century.

Beyond alluvial production, Lucapa has identified multiple kimberlite pipes within the Lulo concession that are in various stages of exploration and evaluation. The discovery of the Luaxe kimberlite, located beneath the alluvial workings, has been described as potentially one of the largest kimberlite discoveries in Angola in decades. If Luaxe advances to production, it would require the kind of heavy infrastructure — processing plants, power generation, water management, bulk supply delivery — that is most efficiently supported by rail access.

Broader Diamond Industry Impact

Beyond Catoca and Lulo, the Lunda provinces host numerous other diamond concessions operated or held by Endiama and its joint venture partners. Kimberlite exploration across the Kasai Shield remains in its early stages, with geological surveys suggesting that only a fraction of the province's diamond-bearing geology has been systematically explored. The arrival of railway infrastructure would lower the threshold for developing smaller deposits that are currently uneconomic due to road-dependent logistics. It would also support Endiama's stated ambition to increase Angola's annual diamond output toward 15 to 20 million carats by 2030, an objective that requires improved infrastructure as much as it requires geological luck.

Rare Earth Connections

While the Luacano-Jimbe branch is primarily aimed at the Lunda provinces' diamond and iron ore deposits, its strategic value to the Lobito Corridor must be understood in the context of Angola's broader mineral development ambitions — and the rare earth element (REE) story is central to that picture.

Longonjo Rare Earth Project

The Longonjo rare earth project, owned by Pensana plc (listed on the London Stock Exchange), is located approximately 15 kilometres from the city of Huambo on the existing Benguela Railway mainline. Longonjo is one of the most advanced rare earth projects in Africa and is designed to produce a mixed rare earth carbonate (MREC) concentrate for downstream processing into separated rare earth oxides, particularly neodymium-praseodymium (NdPr) oxides critical for permanent magnets used in electric vehicles, wind turbines, and defense applications.

Longonjo sits directly on the Benguela mainline rather than on the proposed branch, meaning it does not depend on the Luacano-Jimbe spur for rail access. However, the project is deeply relevant to the branch line discussion for two reasons. First, Longonjo demonstrates the viability of Angola as a rare earth province and validates the Lobito Corridor as a rare earth export route. Pensana's development plan explicitly relies on the Benguela Railway and the Port of Lobito for exporting MREC concentrate to processing facilities, likely in the United Kingdom where Pensana is developing a separation plant at Saltend, near Hull. Second, geological reconnaissance in the Lunda provinces has identified carbonatite complexes and alkaline igneous intrusions that may host additional rare earth mineralization, though these occurrences are at a very early exploration stage. If any of these targets prove viable, the branch line would be their only practicable route to export.

Strategic Significance of a Rare Earth Corridor

The global rare earth supply chain is dominated by China, which controls approximately 60 percent of world mine production and more than 85 percent of processing capacity. Western governments, particularly the United States and the European Union, have identified rare earth supply diversification as a national security priority. Angola's emergence as a potential rare earth producer — with Longonjo as the first mover and the geological potential for additional discoveries — aligns directly with the Lobito Corridor's strategic rationale as a Western-oriented supply chain alternative. The Luacano-Jimbe branch, by expanding the corridor's geographic reach into under-explored mineral terrain, increases the probability that additional rare earth (and other critical mineral) deposits will be discovered and developed within the corridor's catchment area.

Economic Case

The economic feasibility of the Luacano-Jimbe branch depends on three variables: the capital cost of construction, the operating revenue from freight traffic, and the broader economic multiplier effects that railway infrastructure generates in remote regions. Each variable carries significant uncertainty at the current pre-feasibility stage, but preliminary analysis suggests a plausible, if challenging, investment case.

Capital Cost Estimates

New-build railway construction in sub-Saharan Africa typically costs between $2 million and $6 million per kilometre, depending on terrain, gauge, design standards, and the availability of local materials and labor. The Luacano-Jimbe route presents moderately challenging construction conditions: the terrain is not mountainous but includes significant river crossings, the climate is tropical with a long wet season, and the remoteness of the area means that construction materials, equipment, and workforce accommodation must be brought in from considerable distances. A reasonable estimate for a 550-to-600-kilometre single-track Cape-gauge line with passing loops, basic signaling, and modest station facilities would fall in the range of $1.5 billion to $2.5 billion.

Revenue Projections

Freight revenue on the branch would derive from a mix of inbound and outbound traffic. Inbound traffic — fuel, mining equipment, construction materials, consumer goods for Saurimo and other towns — would likely constitute the majority of tonnage in the line's early years, given that diamond output is physically lightweight. Over time, if iron ore deposits near Jimbe are developed to production scale, outbound bulk mineral traffic could eventually dominate, potentially reaching several million tonnes per annum. At a tariff rate of $0.04 to $0.06 per tonne-kilometre (consistent with southern African mineral rail tariffs), a mature branch carrying 3 to 5 million tonnes annually could generate $80 million to $150 million in annual freight revenue — sufficient to service debt and fund maintenance, though unlikely to produce commercial returns without sovereign guarantees or concessional financing for the initial construction.

Passenger traffic, while not the primary economic driver, would also contribute to the line's revenue and social justification. Saurimo's population of approximately 200,000 and the broader Lunda region's population of over 1.5 million people currently lack any rail connection. A basic passenger service would significantly improve mobility, reduce travel times, and lower the cost of personal and commercial travel between the Lunda provinces and the rest of Angola.

Financing Models

Given the scale of investment and the early-stage nature of several potential freight sources, the Luacano-Jimbe branch is unlikely to attract purely commercial financing. Viable financing models would likely involve a combination of Angolan sovereign investment (potentially through oil-backed infrastructure bonds), concessional lending from development finance institutions such as the African Development Bank or the World Bank / IFC, export credit financing tied to equipment procurement, and off-take agreements with anchor mining tenants such as Endiama and Catoca. The US Development Finance Corporation, which has already committed more than $500 million to the Lobito Corridor, could potentially extend its support to the branch line if it is structured as an integral component of the broader corridor system.

Development Timeline

The Luacano-Jimbe branch line remains in the early conceptual and planning stage. No formal construction schedule has been announced, and critical prerequisites including detailed engineering design, environmental and social impact assessments, land acquisition, and financial close have not yet been completed. Based on the development trajectory of comparable African railway projects, the following indicative timeline can be projected.

This timeline is highly indicative and subject to significant acceleration or delay depending on political will, financing availability, and the pace of mineral development in the Lunda provinces. A phased approach — building the Luacano-to-Saurimo segment first to serve Catoca and the provincial capital before extending northward — is the most probable construction strategy, as it delivers economic benefits earliest and allows revenues from Phase 1 to partially support Phase 2 financing.

It is worth noting that Angola has recent experience with large-scale railway construction: the Chinese-built reconstruction of the Benguela Railway between 2005 and 2014, covering 1,344 kilometres, was completed in approximately nine years despite the challenges of post-conflict reconstruction. The Luacano-Jimbe branch, at roughly half the length and traversing terrain that has not been mined or damaged by conflict, could theoretically be constructed more quickly given adequate financing and political commitment.

Challenges

The Luacano-Jimbe branch line faces a set of challenges that are significant but not unprecedented for African railway construction. Understanding these obstacles is essential for any realistic assessment of the project's prospects.

Terrain and Climate

The route crosses a landscape characterized by seasonal watercourses, extensive wetlands during the rainy season, and river valleys that require substantial bridge engineering. The Chicapa and Luachimo river systems, which drain northward into the Kasai and ultimately the Congo River, present multiple crossing points where bridges of 100 metres or more in span will be needed. The tropical climate imposes a construction window of approximately six months per year, as the wet season from October to April renders unpaved construction access roads largely impassable and makes earthworks impracticable. Laterite soils, common in the region, can provide reasonable formation material when properly compacted but are susceptible to erosion and waterlogging without adequate drainage engineering.

Remote Location and Limited Infrastructure

The Lunda provinces are among the most infrastructurally deficient regions of Angola. Paved roads are scarce: the road from Luena to Saurimo is largely unpaved, and the route beyond Saurimo toward Lunda Norte is in poor condition. Electrical grid coverage is minimal outside Saurimo itself. Telecommunications are limited to mobile coverage in and around major towns. Water and sanitation infrastructure is rudimentary. These conditions mean that a railway construction project would need to establish its own supply chains, worker accommodation, power generation, and logistics from virtually zero baseline — adding significantly to project costs and timelines.

Construction contractors would likely need to establish forward operating bases along the route, import virtually all steel, cement, and mechanical equipment, and develop quarries for ballast and aggregate locally. The mobilization phase alone — before any track is laid — could take 12 to 18 months and consume a significant portion of the project budget.

Financing Complexity

At an estimated $1.5 billion to $2.5 billion, the branch line represents a capital commitment roughly equivalent to one-third of Angola's annual non-oil government revenue. The project does not have a clear single anchor shipper capable of underwriting the investment through a long-term take-or-pay contract in the way that, for example, iron ore railways in Australia or West Africa are financed against specific mine outputs. Diamonds are high-value but low-volume; iron ore deposits near Jimbe are not yet sufficiently delineated to support bankable reserve estimates; and Longonjo's rare earth output transits the existing mainline rather than the branch. Assembling a financing package that satisfies lenders' requirements for revenue certainty will require creative structuring, likely involving sovereign guarantees from the Angolan government and concessional terms from development finance institutions.

Endiama and Institutional Capacity

Endiama, Angola's state diamond company, is the natural institutional champion for the branch line. However, Endiama's capacity to lead a large-scale infrastructure project of this nature is uncertain. The company's core competencies lie in diamond mining and marketing, not railway construction or operation. Coordination between Endiama, the Angolan Ministry of Transport, Caminhos de Ferro de Benguela (the state railway company), the Lobito Atlantic Railway consortium (which operates the mainline), and international financing institutions will require institutional alignment that does not currently exist. Establishing a dedicated project entity or special-purpose vehicle for the branch line, with clear governance and decision-making authority, would be a necessary early step.

Geopolitical Considerations

The ownership structure of the Catoca mine, with its 41 percent Alrosa (Russian) shareholding, introduces geopolitical complexity. Western development finance institutions that might otherwise support the branch line may face constraints on providing financing that directly benefits a Russian-controlled mining asset, even if the broader corridor serves Western strategic interests. The Angolan government has thus far navigated this tension by maintaining that Catoca operates independently of Russian state policy, but the issue remains a latent risk for any financing package that involves Western governmental capital.

Environmental and Social Risks

The route traverses areas of ecological sensitivity, including river systems that support artisanal fishing communities and gallery forests that harbour significant biodiversity. Artisanal and small-scale diamond mining (ASM) is widespread in the Lunda provinces, and the arrival of railway infrastructure could intensify conflicts between industrial mining concessions and artisanal operators. Any environmental and social impact assessment would need to address land acquisition and resettlement, impacts on water systems and fisheries, the management of artisanal mining communities, and the potential for the railway to accelerate deforestation by improving access to previously remote areas. These are manageable challenges if addressed through rigorous environmental and social governance, but they add cost, time, and reputational risk to the project.

Competition with Road Investment

The Angolan government is simultaneously investing in road rehabilitation across the Lunda provinces, and there is an inherent tension between road and rail investment priorities. Road improvements, while less transformative than railway construction, deliver benefits faster, at lower per-kilometre cost, and with greater flexibility in routing. Some stakeholders within the Angolan government may argue that road investment offers a higher short-term return than the multi-billion-dollar, decade-long railway construction programme. The branch line's proponents must make the case that only rail can support the volumes and costs required for bulk mineral development — an argument that is strongest for iron ore and weakest for diamonds, where volumes are small and roads may suffice.

Despite these challenges, the Luacano-Jimbe branch line remains one of the most compelling expansion options for the Lobito Corridor. The mineral wealth of the Lunda provinces is real and largely untapped. The infrastructure deficit is severe but not insurmountable. And the strategic alignment between Angola's mineral development ambitions, the corridor's Western-backed investment framework, and the global demand for diversified critical mineral supply chains creates a convergence of interests that few African railway proposals can match. The question is not whether the branch line makes strategic sense — it clearly does — but whether the financing, institutional capacity, and political will can be assembled to move it from concept to construction within a reasonable timeframe.