Hub I project
A Flagship Project in Clean Production of Critical Minerals
our flagship Project
Hub I turns legacy asbestos tailings into three saleable, low-carbon products - high-purity MgO, SCM-grade silica, and Ni/Co MHP - while regenerating process reagents on-site. The result: lower OPEX, smaller waste footprint, and faster path to permits and financing. Located in Québec and powered by clean hydro, Hub I is the world's largest asbestos tailings rehabilitation project and Exterra's commercial proof point that modern mineral processing can be profitable, scalable, and responsible.
Why is Hub I Strategic?
Hub I is the first commercial integration of Exterra’s platform - ARC™ reagent regeneration with proven hydrometallurgy - to convert multicentury serpentine tailings into products with no new waste. By regenerating acid and base on-site, Hub I cuts chemical spend and trucking, eliminates neutralization waste, and stabilizes margins through cycles. Beyond production, Hub I is the reference plant that accelerates the deployment of ARC-based flowsheets across commodities.
Why It Matters
On-site reagent regeneration is designed to beat delivered, single use chemicals cost. Cutting logistics and tailings generation.
Hub I proves that on-site reagent regeneration beats trucked, single-use chemicals - shrinking OPEX, stabilizing input costs, and lifting margins through cycles. It’s the first commercial reference where regenerated-acid economics flip from liability to advantage.
Better unit economics and circular flows translate into simpler approvals and faster financing. Hub I is the bankable proof point that moves projects from studies to steel-in-the-ground sooner.
Hub I provides the bankable reference that enables rapid adoption across commodities and projects.
What We Will Be Delivering
Industry leading low-carbon products
100,000 tpy MgO / 150,000 tpy Silica / 1,000 tpy Ni/Co MHP
100,000 tpy MgO / 150,000 tpy Silica / 1,000 tpy Ni/Co MHP
Flowsheet designed for maximum valorization
no waste stream by design; asbestos fibers neutralized
no waste stream by design; asbestos fibers neutralized
Bankable reference
operating envelopes, SOPs, and lender‑grade data to enable technology licensing and replication across future hubs
operating envelopes, SOPs, and lender‑grade data to enable technology licensing and replication across future hubs
Unparalleled Benefits
site rehabilitation, skilled jobs, and supply opportunities for Québec
site rehabilitation, skilled jobs, and supply opportunities for Québec
Project Highlights
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Objective one
Commercialize ARC™, LOW™, and ROC™ at industrial scale
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Objective two
Demonstrate economic performance and reliability
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Objective three
Deliver a complete, license-ready package
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Objective four
Remediate historical tailings safely and permanently