Name of the Project
Longonjo neodymium/praseodymium project.

Location
The project is located in Huambo, Angola – 4 km from a modern rail line leading directly into the Atlantic Port of Lobito.

Project Owner/s
Pensana Rare Earths holds an 84% interest in Longonjo through its 84% holding in Angola-registered company Ozango Minerais, which owns 100% of the mining licence.

The Angolan government holds a 10% interest and the company’s Angolan partners hold the remaining 6%.

Project Description
Longonjo is one of the biggest rare earths deposits in the world.

Longonjo has indicated and inferred mineral resources of 226-million tonnes grading 1.47% rare-earth oxides and 0.33% neodymium/praseodymium. A prefeasibility study (PFS) has indicated the viability of a long-life, low-cost openpit operation based on a weather-zone component of the Longonjo resource estimate.

The focus of the PFS is on the initial development of the highest-grade portion of the near-surface weathered-zone mineralisation, which is a subset of the total project mineral resource estimate.

The PFS envisages openpit mining and the two-phase development of a two-million tonne-a-year processing plant and associated infrastructure, producing on average 56 000 t/y of neodymium/praseodymium concentrate for export.

The openpit will be a free dig operation with a very low strip ratio. The processing plant will use flotation to produce a high-grade rare-earth concentrate. The project has a nine-year life-of-mine.

The investment has been designed to meet the Equator Principles and Scope 1, 2 and 3 emissions under the Green House Gas Protocol.

Access to low-carbon power from the Luaca hydroelectric dam and local photovoltaic and storage facilities will allow for a very low carbon footprint, combined with closed-circuit zero discharge for process water and tailings, with full end-of-life rehabilitation.

Potential Job Creation
The project will provide training for about 370 jobs at the mine. Local businesses are being prepared to become service providers. A particular focus is on training young women for technical and engineering roles.

Net Present Value/Internal Rate of Return
In the base case scenario, the project has an internal rate of return of 101% with a payback of 13 months.

Capital Expenditure
Initial capital costs are estimated at $130.6-million.

Planned Start/End Date
The project can be put into production in less than 18 months.

Latest Developments
Pensana continues to progress two studies towards becoming a rare earths miner and establishing a magnet metal supply chain to meet rare earths demand from the electric vehicle and offshore wind industries.

The company has appointed consultants, based in Perth, to undertake a feasibility study into the production of mixed rare-earth sulphate in Angola, while the company has also initiated a Wood Group study into the establishment of a UK-based processing facility to produce separated rare-earth oxides.

The processing facility’s study is expected to be concluded in January next year.

Meanwhile, the Longonjo mine and concentrator study is well advanced, with capital costs remaining on track with the $130-million budget stated in the project’s preliminary feasibility study in November 2019.

Pensana in March expanded the scope of the Longonjo mine’s studies to include the processing of concentrate to produce a mixed rare-earth carbonate, following which the company successfully produced the carbonate during trials in October.

Subsequent to this, a resin-based process route was developed that yields a high-grade mixed rare-earth sulphate, which the company believes will be an ideal feedstock for the proposed separation facility in the UK.

Project manager Paradigm Project Management has recently tendered several equipment packages for quotation from suppliers and contractors in preparation for the start of construction of the initial infrastructure and bulk site services at the Longonjo project in the first quarter of 2021.

Key Contracts, Suppliers and Consultants
Paradigm Project Management (owner representative); CGWIC (financing, and engineering, procurement and construction works ); Wood Group (lead engineer, tailings storage facility, infrastructure, mining, process plant engineering, cost estimation, surface-water management); SRK Consulting (mineral resource estimate and model); HCV Africa (environmental- and social-impact assessment and baseline studies); Grupo Simples (environmental and social assessment, stakeholder engagement – Angola); AVM Advogadas (Angola legal); DLA Piper (Australia legal); Vic McLaglen (legal consultant); Auralia Metallurgy (metallurgical testwork facility – flotation); Bureau Veritas Minerals (metallurgical testwork – comminution); ALS Mineralogy (mineralogy testwork); Dr Wally Witt  (geological consultant); ARQ Consulting (geotechnical studies); HCV Africa (hydrology, borefield testing and modelling); Conrad Partners (transport and rare-earth concentrate market); and Nagrom Laboratories (sample assays).

Contact Details for Project Information
Pensana Rare Earths, contact@pensana.co.uk.