Road & Port Overview

The Road: 230 Kilometres Across the Tundra

The road component of the GBRP would run approximately 230 kilometres from the northern terminus of the Tibbitt to Contwoyto winter road, near the Nunavut-Northwest Territories border, north to Grays Bay on the Coronation Gulf. This would effectively extend Canada's road network from Yellowknife, through the existing winter road corridor, to the Arctic coast.

The proposed route traverses barren-ground tundra over continuous permafrost. The terrain is largely flat to gently rolling, dotted with lakes, wetlands, and river crossings. The road would be constructed as an all-season gravel road, meaning it would remain passable year-round rather than operating only during the winter freeze period like the existing ice road network.

The connection point matters. The Tibbitt to Contwoyto winter road is the longest seasonal ice road in the world, running roughly 400 kilometres from just outside Yellowknife to the diamond mines near Lac de Gras and Contwoyto Lake. It typically operates from late January to late March. The Grays Bay road would connect to this network's northern end, meaning that during the winter road season, there would be a continuous surface route from Yellowknife to the Arctic Ocean. The all-season road portion, from Contwoyto Lake to Grays Bay, would operate year-round.

The Deep-Water Port

The port at Grays Bay is designed as a multi-purpose facility far more capable than a simple loading dock. As specified in the project filings, the port would include:

• Two large deep-water wharves capable of accommodating vessels up to 100,000 deadweight tonnage (DWT), which includes large ore carriers as well as polar icebreakers, offshore patrol ships, and patrol submarines
• One medium-vessel wharf for smaller commercial and service vessels
• Two barge landing areas, one equipped with roll-on, roll-off capability for vehicle and heavy equipment transfer
• A small craft harbour with boat launch for local and service vessels
• Fuel storage and transfer facilities
• Covered and open storage areas for cargo staging

The 100,000 DWT capacity is significant. For context, this is the size class of Panamax bulk carriers. No existing port facility on Canada's Arctic coast approaches this capacity. The Port of Churchill on Hudson Bay, the only other deep-water port in Canada's North, handles much smaller vessels and faces its own operational limitations.

The port's location on the Coronation Gulf places it directly along the Northwest Passage shipping corridor. While ice conditions limit year-round marine access, the seasonal shipping window, typically July through October, would allow mineral concentrates stockpiled during winter to be shipped out during the open-water period.

The Airstrip

The project includes a 6,000-foot (1,830-metre) airstrip at Grays Bay. This length can accommodate most turboprop aircraft and many mid-size jets, providing year-round air access to the facility. The airstrip would serve both the port operations and the broader Kitikmeot region, adding an air access point in an area where the nearest airports are in Kugluktuk and Cambridge Bay.

Engineering Challenges

Building a 230-km road and port facility in the Arctic presents engineering challenges that do not exist in southern Canada. The primary ones include:

Permafrost

The entire project area lies within the zone of continuous permafrost, where the ground is permanently frozen from near the surface to depths of several hundred metres. Building on permafrost requires either keeping it frozen or designing structures that can accommodate thaw settlement. Roads and buildings must be insulated from the ground to prevent heat transfer that would melt the permafrost and destabilize foundations.

The Inuvik-Tuktoyaktuk Highway, completed in 2017, provides the most direct engineering precedent. That project built insulating embankments thick enough to protect the underlying permafrost through the road's design life, accounting for projected climate warming. Similar techniques would be applied to the Grays Bay road, though the specific permafrost conditions and thermal regime along the route will differ.

Seasonal Constraints

Construction in the Arctic is heavily constrained by season. Heavy equipment movement across tundra is typically restricted to winter when the ground is frozen and snow-covered, preventing surface disturbance. Concrete and steel work at the port site is limited to the brief summer season. The Inuvik-Tuktoyaktuk Highway was built primarily through winter construction campaigns, with crews working 24 hours per day in extreme cold and wind.

Materials and Logistics

Granular material (gravel, aggregate) for road construction must be sourced locally, as shipping bulk materials to the Arctic is prohibitively expensive. Identifying and permitting borrow pits along the route is a significant component of the planning process. Steel, concrete, and specialized equipment would need to be barged in during the short shipping season or transported over the winter road.

Marine Construction

The port construction involves marine works in an area with seasonal sea ice, limited bathymetric survey data, and extreme weather. Wharf construction, dredging if required, and installation of marine infrastructure must be completed within the open-water window or use ice-season construction techniques.

Cost and Funding

The total project cost has been estimated at approximately $1.5 billion to $2 billion, though the figure has evolved as the project scope has expanded to include dual-use military capabilities. Earlier estimates placed the cost at roughly $1.2 billion for the civilian-only version.

Funding is expected to come from multiple sources. The Canada Infrastructure Bank has signed a Memorandum of Understanding for accelerator funding to support pre-construction work. ATCO's $10-million investment in WKR represents private-sector capital. Federal government funding through infrastructure and defence budgets is anticipated, particularly following the March 2026 announcement referring the project to the Major Projects Office for expedited review.

The economic case rests primarily on the mineral revenues the road and port would enable. The Izok Lake and High Lake deposits alone are projected to produce 180,000 tonnes of zinc and 50,000 tonnes of copper annually. At current commodity prices, the mineral export value would be measured in billions per year, providing a revenue base to service infrastructure investment.

Dual-Use Design

A notable evolution in the project design is the incorporation of military capabilities. The port wharves are sized to accommodate Canadian Naval vessels including Arctic and offshore patrol ships and submarines. The airstrip provides a forward operating capability. This dual-use concept aligns with the broader federal emphasis on Arctic sovereignty and defence presence, as articulated in the March 2026 northern infrastructure announcement.

The dual-use approach also changes the project's funding calculus. Defence infrastructure spending can be justified on sovereignty grounds independent of the mineral economics, potentially providing an additional funding stream and political impetus.