Sierra Mineral Holdings

What Sierra Mineral Holdings does

Sierra Mineral Holdings I Limited (SMHL) is the largest operational bauxite mining company in Sierra Leone, holding a 321.7 km² mining lease in Moyamba, Bonthe, and Bo Districts along the same geological belt as Guinea's world-class bauxite deposits. Its single core product is premium washed gibbsitic bauxite suitable for low-temperature alumina refineries, with chemistry specifications of Available Al₂O₃ 41.5–42.5% and Reactive SiO₂ 3.0–3.6%. Production runs through an integrated chain of open-pit mining, wet washing and beneficiation (including two German-technology attrition scrubbing/desliming plants commissioned at Gondama in 2019), dry beneficiation at the Mokanji concession during the December–May dry season, and kiln drying at the Nitti-2 port. SMHL is the first Sierra Leonean company to load Cape-size vessels (up to 177,931 DWT), exporting via a deep-sea buoy 32 nautical miles offshore using an owned river fleet of push-boats and 2,000–2,500 tonne barges. Current commercial capacity is 1.5 million tonnes per annum (rising to 2.2 million tpa with seasonal Dry Beneficiated Bauxite), with a bankable-feasibility-stage expansion targeting 4 million tpa in Mokanji.

SMHL generates revenue through one-time bulk commodity sales of bauxite under FOB and FAS incoterms, executed primarily through medium-to-long-term offtake agreements with globally recognized European traders who on-sell to alumina refineries and aluminum smelters. The customer base is concentrated within the global alumina/aluminum supply chain; a single December 2024 offtake for 1.4 million tonnes anchors near-term volumes. Pricing is per-tonne, governed by individual sales agreements and prevailing market conditions, with no publicly disclosed price list. The company contributes approximately USD 6–8 million per annum in taxes and levies to the Government of Sierra Leone, commits 1% of gross sales to community development, and operates with a workforce that is 96% Sierra Leonean (75% from mining-affected communities), in compliance with the Sierra Leone Local Content Act 2016. Ownership transitioned in 2023 when Alum Tulcea (99.4% owned by Romania's Alro) divested SMHL via sale of Global Aluminium Ltd BVI to a local Sierra Leone investor.

Name

Sierra Mineral Holdings

Legal name

Sierra Mineral Holdings I Limited

Website

https://sierramineral.com

Company type

Private

Founded year

2008

Operating status

Operating

Headcount range

501–1,000 employees

Ownership category

akta.pro rank

Product category

Bauxite Mining

NAICS

Other Metal Ore Mining (21229)

SIC

Metal Mining (1000), Miscellaneous Metal Ores (1090), Wholesale-Metals & Minerals (No Petroleum) (5050)

akta.pro primary industry

Bauxite Mining & Beneficiation (IMAKACAA)

akta.pro secondary industries

Mine Development & Processing EPC (Critical Minerals) (IMAKAFAM), Exploration & Resource Development (Critical Minerals) (IMAKAFAL)

Keywords

• Bauxite mining
• Washed bauxite production
• Alumina refinery supply
• Mining export logistics
• Mineral processing operations

Headquarters

HQ city

Freetown

HQ country

Sierra Leone

Offices2 records

Markets served

GTM type

B2B

Offering type

Hardware or Manufacturing

Cost components

Personnel, Operations, Supply Chain, Infrastructure, Others

Revenue model

1. Bauxite Commodity Sales: SMHL generates revenue through the extraction and sale of washed and dry beneficiated bauxite to global alumina refineries and aluminum smelters. Revenue is realized as one-time commodity transaction per shipment under FOB or FAS incoterms, backed by offtake agreements and spot sales with European traders. The company's production capacity ranges from 1.5 to 2.2 million tonnes per annum depending on seasonal dry benefaction output.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Sierra Mineral Holdings I Limited (SMHL) is the largest operational bauxite mining company in Sierra Leone, extracting and processing run-of-mine ore into premium washed gibbsitic bauxite (and dry beneficiated bauxite) for export to global low-temperature alumina refineries and aluminum smelters. The company operates open-pit mining, wet washing/beneficiation, dry beneficiation, kiln drying, and river-fleet transhipment from the Nitti-2 port, exporting Cape-size and Supramax vessel loads under FOB/FAS terms.

Product overview

Sierra Mineral Holdings I Limited (SMHL) operates as a large-scale bauxite mining company in Sierra Leone. The company's primary product offering is Premium Washed Bauxite, a gibbsitic bauxite suitable for low temperature alumina refineries. SMHL produces washed bauxite through a comprehensive production chain that includes exploration, open pit mining, wet washing/beneficiation, drying, and transhipping operations. The company currently produces 1.5 million tons of washed bauxite per annum and is expanding its Mokanji operations to increase overall production capacity.

Differentiator

Problem solved

Functional benefit

Products and services

• Premium Washed Bauxite Premium grade gibbsitic bauxite produced by crushing and wet screening run-of-mine ore. Specifications include Total Al2O3 48.0%, Available Al2O3 41.5–42.5% at 145°C, and Reactive SiO2 3.0–3.6%. Sold to low-temperature alumina refineries under offtake and spot sales agreements.
• Dry Beneficiated Bauxite (DBB) Dry benefaction product from Mokanji producing 500,000 tonnes per annum, limited to dry season (December–May). Enhances overall production capacity from 1.7 to 2.2 million tonnes per annum.

Quantifiable outcome

• Cape-size export reduces freight costs by enabling economics of scale compared to Supramax vessels, making SMHL bauxite more competitive globally.
• +1 more outcomes

Named customers1 record

Segments1 record

Ideal customer profiles1 record

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Four partnerships are on record, tiered core and minor.

• Sierra Leone Local Content Agency (SLLCA)coreStrategic or Co-development Partner · 8 October 2025SMHL and the Sierra Leone Local Content Agency signed a Local Content Plan Implementation Agreement (2025–2027) at SLLCA's Conference Hall in Freetown. The agreement prioritizes Sierra Leonean suppliers, transparency, and sustainable economic growth. SMHL obtained a Certificate of Authorization to operate as required under section 40(1) of the Sierra Leone Local Content Act 2016. HR Director noted 96% of SMHL's workforce are Sierra Leoneans, 75% from mining-affected communities.
• GAMI (continuation)coreStrategic or Co-development Partner · 5 April 2024GAMI continued engagement with SMHL, resulting in the successful completion of the Bankable Feasibility Study (BFS) for the Mokanji mine expansion, announced April 2024. The expansion project is projected to generate significant economic returns, create 1,000 direct and 3,000 indirect jobs, and contribute USD 10 million annually to Sierra Leone's GDP.
• Guiyang Aluminum & Magnesium Design Institute Co., Ltd. (GAMI)coreStrategic or Co-development Partner · 4 September 2019SMHL and GAMI signed a letter of intent during the 8th International Conference & Exhibition of IBAAS-GAMI 2019 in Guiyang, China to carry out a bankable feasibility study for a 200,000 tpa Alumina Hydrate Production Plant in Sierra Leone. The official contract was scheduled for mid-October 2019, with the BFS targeted for completion within 6 months. GAMI comprises internationally recognized alumina technologists, process engineers and technicians.
• SRK ConsultingminorImplementation/ SI/ Consulting PartnerSMHL engaged the expertise and services of SRK Consulting to provide appropriate design and engineering construction solutions for the rehabilitation and reconstruction of tailing storage facilities at Gondama. SRK's engagement ensures compliance with environmental and safety standards.

Scale indicators11 records

Recent moves8 records

Expansion highlights5 records

Broad incumbents

• Emirates Global Aluminium (EGA): UAE-based integrated aluminum producer with bauxite mining operations in Guinea; comparable as a major bauxite-to-aluminum value chain participant with West African upstream assets.
• Alcoa Corporation: One of the world's largest integrated aluminum producers with substantial global bauxite mining operations; comparable as a major upstream bauxite supplier serving alumina refineries, with the added dimension of a Guinea (CBG) foothold.
• Rio Tinto: Global mining major with large bauxite operations including Amrun in Australia and a stake in Guinea's CBG; comparable as a major participant in the bauxite value chain serving alumina refineries worldwide.
• Hindalco Industries (Aditya Birla Group): Indian integrated aluminum producer owning significant captive bauxite mines; comparable upstream bauxite operations feeding global aluminum supply chains, though at much larger scale and with downstream integration.
• China Hongqiao Group: One of the world's largest aluminum producers with integrated bauxite mining operations in China and overseas; comparable as a large-scale bauxite consumer-producer with global supply chain reach.

Direct peers

• Compagnie des Bauxites de Guinée (CBG): Major bauxite mining operator in Guinea on the same geological belt as SMHL; produces metallurgical-grade bauxite for global alumina refineries, making it the closest geographic and product comparable despite its significantly larger scale.
• Ashapura Minechem: Indian-headquartered mining company with bauxite mining operations serving the global aluminum industry; comparable as a multi-region, bauxite-focused producer selling into alumina refineries.
• Bosai Minerals Group: Chinese-owned operator of bauxite mines in Ghana and one of the largest bauxite producers in West Africa; directly comparable geography, product mix, and export-oriented business model.
• Alufer Mining: West Africa-focused bauxite miner that operated the Bel Air mine in Guinea; a pure-play bauxite exporter serving the global alumina supply chain — closely comparable in business model, customer base, and product to SMHL.
• First Bauxite Corporation: Pure-play bauxite mining company with operations in Guyana and Brazil, selling metallurgical bauxite into global alumina markets; comparable as a non-integrated, single-commodity bauxite producer.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks7 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/sierra-mineral-holdings-i-ltd-

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sierra Mineral Holdings