Mahenge graphite project, Tanzania – update

Location map of the Mahenge project

Photo by Black Rock Mining

2nd June 2023

By: Sheila Barradas

Creamer Media Research Coordinator & Senior Deputy Editor


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Name of the Project
Mahenge graphite project.

Ulanga district of the Morogoro region, Tanzania.

Project Owner/s
Australian mining company Black Rock Mining.

Project Description
Mahenge will be an openpit mining operation, based on mining the Ulanzi and Cascade deposits.

An independent review of the front-end engineering design (FEED) and an enhanced definitive feasibility study (eDFS) has confirmed the Tier 1-scale Mahenge project as robust, with attractive returns.

The project will use contract mining as proposed in the eDFS instead of owner operator mining.

Mahenge ore will be processed over the life-of-mine (LoM) using a four-stage approach where four process plants will be built sequentially in a modular format.

Processing throughput will initially be one-million tonnes a year when the Module 1 process plant is commissioned, increasing to two-million tonnes a year when Module 2 is commissioned, to three-million tonnes a year when Module 3 is commissioned and to four-million tonnes a year with the completion of Module 4.

The four stages will be developed over the initial years of the mine, with the current mine schedule indicating an LoM of 26 years, after which the current defined deposits will be depleted.

The Module 1 and 2 process plants will process ore from the Ulanzi deposit, while the Module 3 and 4 process plants will process ore from the Cascade and Epanko deposits.

The Module 1 process plant will be fed run-of-mine ore at an average grade of 8.24% total graphitic carbon and will recover an estimated 93% of this graphite to produce about 89 000 t/y of graphite products over the first 20 full years of production.

Potential Job Creation
Not stated.

Net Present Value/Internal Rate of Return
The project has an after-tax net present value, at a 10% nominal rate, of $1.38-billion and an internal rate of return 36%, with a payback of 3.8 years.

Capital Expenditure
Based on the FEED work, the updated capital cost estimate for the development of Module 1 is $182-million, including a contingency allowance of $22-million. Module 2 is estimated $107-million. The updated capital expenditure for modules 3 and 4 is estimated at $117-million and $104-million respectively.

Planned Start/End Date
Black Rock Mining is targeting first production from its Mahenge graphite project in 2024.

Latest Developments
Black Rock Mining has signed a binding offtake agreement with strategic alliance partner POSCO covering all of the planned life-of-mine graphite fines for Module 1 of the Mahenge project.

The agreement includes a $10-million prepayment commitment, which is linked to an industry pricing benchmark, with the funding to be used as part of the construction financing for the project.

Black Rock recently signed a memorandum of understanding with POSCO over the natural large flake graphite concentrate expected from the Module 1 operation at Mahenge.

Key Contracts, Suppliers and Consultants
None stated.

Contact Details for Project Information
Black Rock Mining, tel +61 8 9320 7550 or email

Edited by Creamer Media Reporter


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