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NioCorp progresses to first phase of Elk Creek EPC contracting with Zachry Group pact

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NioCorp Developments Ltd has executed a contract with Zachry Group to develop a cost for the surface facilities associated with NioCorp’s Elk Creek critical minerals project in Nebraska, USA.

The contract represents the first phase of engineering, procurement and construction (EPC) contracting for the $1.2 billion project, the company says.

NioCorp had previously selected Zachry, one of the world’s leading turnkey engineering, construction, maintenance, turnaround and fabrication companies, as its EPC firm for the project’s surface facilities.

“We are very pleased to take this important next step with Zachry as it positions NioCorp to advance to a construction start following receipt of sufficient project financing,” Mark Smith, Chairman and CEO of NioCorp, said. “Zachry is a highly respected company with an excellent track record of success in large projects such as ours, and I am pleased to continue our partnership with Zachry as we work together to bring the Elk Creek Project to commercial reality.”

Scott Honan, NioCorp’s Chief Operating Officer, added: “Zachry has a large craft workforce and a strong presence in Nebraska. Together with our long relationship with the Zachry team, this makes for a great fit with the Elk Creek project. Having spent time at Zachry’s offices and multiple project sites, I am confident that Zachry can execute their scope of work on our project in a safe, timely, and cost-effective manner.”

Ralph Biediger, EPC President, Zachry Group, said: “We are excited to work with NioCorp to support the development of critical minerals that will help the United States transition to a lower-carbon economy. We look forward to bringing our decades of EPC experience to bear on this vitally important project and continuing our long-term presence in Nebraska.”

A 2022 feasibility study outlined a project able to process 36.7 Mt of of ore over a 38-year life of mine to produce 171,140 t of niobium in the form of ferroniobium, 3,676 t of Sc2O3 and 431,793 t of TiO2. Rare earths have been added to the mineral resource, and the indicated resource contains 632,900 t of total rare earth oxides.

NioCorp working with Weir Minerals, NRRI on Elk Creek HPGR test work

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NioCorp Developments Ltd is to initiate testing of Elk Creek project ore using high pressure grinding rolls (HPGR) technology from Weir Minerals.

HPGR technology is considered an energy efficient and low-emission alternative to conventional processing for reducing the size of the ore to enable the recovery of niobium, scandium, titanium, and potential rare earth products, NioCorp said.

The use of this technology in the project reinforces the company’s commitment to the environment and designing a sustainable operation, it added.

The testing is being conducted at the Natural Resources Research Institute (NRRI) of the University of Minnesota-Duluth, in partnership with Weir Minerals. During the testing, which is expected to take several weeks, around 3 t of Elk Creek drill core will be reduced to the 1-mm size needed for hydrometallurgical test work.

Working with Weir Minerals, NRRI acquired an industrial-scale Enduron® HPGR to carry out testing on a variety of ores with this process back in 2020. This is the only large scale HPGR dedicated to research in the US, NRRI claims.

“The network is expected to provide key data that will be used to properly size the HPGR unit for the potential ore throughput at the Elk Creek project, once project financing is secured and the project is operational,” NioCorp said.

The company is currently evaluating the next steps in its overall metallurgical test work program, which will focus on optimising and streamlining the existing processing flowsheet as well as establishing process routes for the potential recovery of rare earth products. The rare earth products that are of most interest to the company are, at present, neodymium-praseodymium (NdPr) oxide, terbium oxide and dysprosium oxide. As previously announced, the company has launched a review of the economic potential of expanding its currently planned product suite from the project to also include rare earth products.

An April 2019 feasibility study on Elk Creek, in Nebraska, USA, estimated average production of 7,220 t/y of ferroniobium, 95 t/y tpa of scandium trioxide and 11,642 t/y of titanium dioxide over the 36-year mine life.

Scott Honan, NioCorp COO, said: “After witnessing testing at NRRI, I was impressed with how the HPGR was able to handle the Elk Creek ore quickly and efficiently, with minimal noise and dust.

“We look forward to completing this phase of the test work and moving on to look at further improvements to the existing flowsheet, including our new emphasis around the rare earths.”