Name of the Project
Mahenge graphite project.
Black Rock Mining.
Mahenge will be an openpit mining operation based on mining the Ulanzi and Cascade deposits using a conventional truck-and-shovel method.
The deposit is the fourth-biggest Joint Ore Reserves Committee-compliant contained graphite resource in the world.
In July 2019, Black Rock released an enhanced definitive feasibility study (DFS) on the project.
Ore will now will be processed using a four-module approach over 26 years, a decrease in the life-of-mine (LoM) of 32 years estimated in the DFS. Total LoM production has increased from 6.6-million tonnes in the DFS to 7.4-million tonnes in the enhanced DFS.
Conventional opencut techniques will be used to mine.
Processing will be undertaken using well-proven crushing, grinding and flotation methods, comprising:
Module 1, which will include a processing plant and infrastructure at a nominal design basis rate of one-million tonnes a year to produce up to 83 000 t/y of graphite concentrate in the first two years of production. The plant will be based at the Ulanzi pit.
Module 2, which will include a second one-million-tonne-a-year plant and associated additional infrastructure, doubling throughput to two-million tonnes a year, and graphite concentrate production to 167 000 t/y from Year 3 of operation. Module 2 includes some shared equipment with Module 1. The plant will be based at the Ulanzi pit.
Module 3, which will include a third one-million-tonne-a-year plant and associated additional infrastructure, increasing throughput to three-million tonnes a year, and graphite concentrate production of up to 250 000 t/y from Year 3 of operation.
Module 4, which will produce an additional 85 000 t/y of graphite concentrate, increasing total steady-state production to between 340 000 t/y to 350 000 t/y of graphite concentrate.
The additional mill feed in the enhanced DFS will be sourced by developing a third pit at the Epanko deposit.
Epanko ore is exclusively incorporated into Module 4, with production starting in Year 7 of the compressed schedule.
Epanko will contribute 9.9-million tonnes at 6.7% total graphitic carbon (TGC) for an additional 660 000 t of concentrate.
Potential Job Creation
Net Present Value/Internal Rate of Return
The projected after-tax net present value of the project has increased by 30%, from $895-million in the DFS to $1.16-billion in the updated DFS, with the internal rate of return having increased from 42.8% to an estimated 44.8%.
Total capital expenditure for all four modules is estimated at $337-million.
Module 1 capital costs have increased from the $115-million estimated in the original DFS to $116-million in the updated DFS.
Module 2 capital costs are estimated at $69.5-million.
Module 3’s capital costs have increased marginally from $84.2-million in the DFS to $85.3-million in the enhanced DFS.
Module 4 will cost $67.1-million.
The $222-million required for modules 2, 3 and 4 will be funded from in-house cash flow.
Planned Start/End Date
First production from Mahenge has been targeted for between 2020 and 2021, with the timing of the first production subject to finance.
The enhanced DFS has noted that the development schedule, subject to financing and confirmation of the Tanzanian government’s 16% free carried interest, will consider four production modules, one a year after the first module, rather than every two years as indicated in the DFS.
Black Rock Mining will raise A$25-million in a share placement to institutional and professional investors, to advance the development of its Mahenge project.
The company announced on May 6 that it had received firm commitments for the placement of more than 104.1-million shares, at 24c each. The shares will be issued under the company’s existing placement capacity.
Black Rock reported a 25% increase in the measured resource at Mahenge in February. The mineral resource is estimated at 213.1-million tonnes, at 7.8% total graphitic carbon, with the measured resource comprising 31.8-million tonnes and the indicated resource 84.6-million tonnes.
Key Contracts, Suppliers and Consultants
Contact Details for Project Information
Black Rock Mining, tel +61 8 9320 7550 or email email@example.com.