Critical Minerals

Minerals processing and extractive metallurgy: comminution, upgrading, hydrometallurgy, and pyrometallurgy, applied to hard rock, tailings and residue reprocessing, concentrate beneficiation, and battery material feeds.

Critical minerals processing plant

The orebody is never fully known, and the impurity suite decides what is viable. A conventional study locks its assumptions early, returns one answer slowly, and must be reworked each time the picture changes.

Roebling builds the option space instead, and holds it on one basis from concept through feasibility. First-cut economics arrive in days, not months. The model stays live as additional test work data is introduced, allowing holistic refinement of the flowsheet.

Portrait of Crystal Bleecher, PE, Critical Minerals Team Lead at Roebling

Kimberly gordon

Critical minerals team lead

“Building the critical minerals supply chain is a massive, capital-intensive engineering challenge in which every project must prove its economic resilience early on. It's a game of small margins at massive scale—where a minor misstep in process flow design or supply chain planning compounds into millions down the line. I love helping teams de-risk the hard stuff early, so the economics actually hold up.”

Previously

Merrick logo
Bechtel logo

A new basis for study work

Every credible feed, flowsheet, process condition, and site option is assessed in parallel in the concept phase, so the test-work budget is committed only to what survives screening.

Grade and recovery assumptions, impurity elements, and processing configuration are held within a single framework, so any change moves the mass balance, equipment sizing, and capital together.

Documentation prepared to support your Qualified Person's technical report, never to replace it.

One Partner, from Concept to Feasibility

R&D

FID

Concept (Scoping / PEA)

Go or no-go, and which options do we carry forward?

AACE Class 5

For teams screening options before committing capital.

Build and compare scenarios across the whole option space; identify prefeasibility targets.

Concept (Scoping / PEA)

Go or no-go, and which options do we carry forward?

AACE Class 5

For teams screening options before committing capital.

Build and compare scenarios across the whole option space; identify prefeasibility targets.

Pre-feasibility (PFS)

Which configuration do we commit to, and at what budget?

AACE Class 4

For teams converging on one design.

Compare business cases and their sensitivities; the model refines as test work and piloting bring definition.

Pre-feasibility (PFS)

Which configuration do we commit to, and at what budget?

AACE Class 4

For teams converging on one design.

Compare business cases and their sensitivities; the model refines as test work and piloting bring definition.

Pre-feasibility (PFS)

Which configuration do we commit to, and at what budget?

AACE Class 4

For teams converging on one design.

Compare business cases and their sensitivities; the model refines as test work and piloting bring definition.

Feasibility (DFS)

Can we finance this, and what will it actually cost?

AACE Class 3

For teams heading into FID.

One configuration, carried on the same basis into the FID package, alongside the detailed engineering the stage demands.

Feasibility (DFS)

Can we finance this, and what will it actually cost?

AACE Class 3

For teams heading into FID.

One configuration, carried on the same basis into the FID package, alongside the detailed engineering the stage demands.

Feasibility (DFS)

Can we finance this, and what will it actually cost?

AACE Class 3

For teams heading into FID.

One configuration, carried on the same basis into the FID package, alongside the detailed engineering the stage demands.

Typical deliverables

Scoped to the decision at hand. Any of:

Technical definition

  • Process design criteria

  • Flowsheet configuration

  • BFDs

  • Mass and energy balances

  • Stream tables

  • PFDs

  • Recovery and reagent consumption schedules

  • Equipment list and general arrangement

Cost and economics

  • Capital cost estimate classed to the stage of study

  • Operating cost build-up

  • NPV, IRR, and payback with sensitivities and Monte Carlo

  • $/tonne across price and credit-metal scenarios

  • Trade-off and site comparison cases

  • Project schedule

What customers say about Roebling

“That's saving me months of work. It's so customizable that if you can dream it, you can pretty much do it. Which is great.”

Director of Sites & Project Management

tailings redevelopment company

“That's saving me months of work. It's so customizable that if you can dream it, you can pretty much do it. Which is great.”

Director of Sites & Project Management

tailings redevelopment company

“I built exactly that by hand. Opex, capex, materials, all in one Excel model. It was a gigantic pain. I have lived every part of what you just described.”

Lead Metallurgist

critical minerals recovery project

“I built exactly that by hand. Opex, capex, materials, all in one Excel model. It was a gigantic pain. I have lived every part of what you just described.”

Lead Metallurgist

critical minerals recovery project

“We have all been there. Process changes cascade downstream into mechanical, electrical, structural, and none of it is integrated. The financial model just sits off to the side.”

Head of Battery Materials

global mining major

“We have all been there. Process changes cascade downstream into mechanical, electrical, structural, and none of it is integrated. The financial model just sits off to the side.”

Head of Battery Materials

global mining major

“What we want is not one project. It is a platform, so we can deploy quickly across every new project as it comes up.”

Process Lead

top-tier global mining major

“What we want is not one project. It is a platform, so we can deploy quickly across every new project as it comes up.”

Process Lead

top-tier global mining major

Frequently Asked Questions about Roebling

Frequently Asked Questions about Roebling

Frequently Asked Questions about Roebling

We cannot afford a two-year bankable study. Where do you engage?

Earlier, where the leverage is. Scoping and prefeasibility are where flowsheets are chosen and test-work budgets committed, and where a single data point from a consultancy is least sufficient. Roebling gives you the option space and first-cut economics now, then carries the same basis forward as the project advances.

We cannot afford a two-year bankable study. Where do you engage?

Earlier, where the leverage is. Scoping and prefeasibility are where flowsheets are chosen and test-work budgets committed, and where a single data point from a consultancy is least sufficient. Roebling gives you the option space and first-cut economics now, then carries the same basis forward as the project advances.

Does this replace our Qualified Person or the technical report?

No, and it is not designed to. The reporting codes put a person, not a platform, behind the stamped report. Roebling prepares the modeling and documentation that sit underneath your Qualified Person's work, so the report rests on a broader and more current basis than a single hand-built case.

Does this replace our Qualified Person or the technical report?

No, and it is not designed to. The reporting codes put a person, not a platform, behind the stamped report. Roebling prepares the modeling and documentation that sit underneath your Qualified Person's work, so the report rests on a broader and more current basis than a single hand-built case.

Commit test work and capital to the projects that earn it.

Commit test work and capital to the projects that earn it.

Commit test work and capital to the projects that earn it.

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Copyright © 2026 Roebling. All Rights Reserved.

Newsletter

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By subscribing you agree to Roebling’s privacy policy. Unsubscribe anytime.

Copyright © 2026 Roebling. All Rights Reserved.

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