Deep Yellow's (ASX:DYL) Tumas Project Reaches Critical Inflection

Sonal Goyal

28 April 2026 10:16 PM AEST

Deep Yellow's (ASX:DYL) Tumas Project Reaches Critical Inflection

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Highlights

Detailed engineering for the Tumas uranium project in Namibia reached 68% completion at March 2026 quarter end, with bulk earthworks 91% complete and civil construction expected to commence in the next quarter.
The company maintained a group cash balance of A$171.6 million at 31 March 2026, providing runway to reach a final Investment decision when market and geopolitical conditions align.
DYL shares rose 3.875% to A$2.010 on 28 April 2026, with a Market Capitalisation of approximately A$1.88 billion, as investors responded positively to the project's continued de-risking progress.

Deep Yellow Limited (ASX:DYL) was one of the stronger performers among uranium-exposed ASX stocks on 28 April 2026, rising A$0.075 or 3.875% to close at A$2.010. The session saw 4,257,587 shares traded against a tight bid-offer spread of A$2.000 to A$2.020, reflecting orderly appreciation rather than speculative Volatility. At that close, the company's Market Capitalisation stood at approximately A$1.88 billion.

The positive price action came alongside the release of Deep Yellow's March 2026 quarterly activities report, which documented continued and material progress across the company's flagship Tumas uranium project in Namibia. In a uranium market characterised by ongoing Supply uncertainty and sustained Demand from the global nuclear energy renaissance, investors have been rewarding uranium developers that demonstrate tangible advancement toward construction readiness and a final Investment decision.

Tumas Project: Engineering and Early Works Progress

The Tumas Project in Namibia remains Deep Yellow's primary focus and the central value driver for the company's Market Capitalisation. Located approximately 80 kilometres east-southeast of Swakopmund and accessible via the sealed C28 road, Tumas holds a granted Mining Lease (ML237) covering the Tumas 1, Tumas 2, Tumas 3, Tumas 1 East, and Tubas Red Sand/Calcrete orebodies. These represent a substantial uranium resource within one of the world's premier uranium-producing jurisdictions.

At the end of the March 2026 quarter, detailed engineering for Tumas had reached 68% completion and the 3D engineering model was 76% complete. More than 79% of all major equipment for the process plant had been tendered, with most long-lead equipment packages awarded subject to conditions precedent including the final Investment decision. This procurement progress is particularly significant — it reduces execution risk by locking in suppliers and confirming equipment availability ahead of a construction mobilisation decision.

The bulk earthworks program reached 91% completion by quarter end and is expected to be fully completed in May 2026. These early works activities include excavating to competent ground conditions, backfilling, terracing for the process plant, construction of laydown areas, perimeter access roads, and the site run-off water pond. The company is currently evaluating civil and concrete packages for the next phase of early works, which are expected to commence once bulk earthworks are complete.

Infrastructure: Power and Water Progress

Two of the most critical infrastructure dependencies for the Tumas Project — power and water Supply — are progressing on separate tracks. Following the execution of a Transmission Power Supply Agreement with NamPower in December 2025, Deep Yellow continues to advance detailed design for the power Supply grid connection and associated infrastructure. This agreement provides certainty around the project's electricity Supply pathway, a key de-risking element for project lenders evaluating Tumas.

Negotiations are continuing with NamWater for the development of the water pipeline, associated infrastructure, and the water Supply agreement. Water access is a fundamental requirement for any uranium processing operation, and securing a long-term Supply agreement with NamWater is a prerequisite for full construction readiness. The company has indicated these negotiations are progressing, though no binding agreement has yet been announced.

Project Financing

Financing is one of the most watched variables for Deep Yellow's Investment case. The company confirmed that in December 2025, the Independent Technical Expert completed Due Diligence on Tumas and found no material issues — a significant positive signal for the financing process. Deep Yellow is working closely with Nedbank Limited, the Mandated Lead Arranger, to progress project financing arrangements for Tumas.

Successful completion of project financing, combined with a supportive uranium price environment and resolution of geopolitical uncertainties that have historically delayed FID timing, would represent the critical catalyst for the company's transition from developer to constructor. The Board's April 2026 site visit to Tumas — the first post-quarter milestone — to review early works progress and meet with key regional Stakeholders reinforces management's active engagement with the project's development trajectory.

Exploration: Namibia and Australia

Deep Yellow completed a reverse circulation infill drilling program at the Tinkas Prospect in Namibia during the March quarter, comprising 133 holes for 1,363 metres. The program confirmed the presence of uranium mineralisation in calcretised palaeochannel sediments and in fractures within basement lithologies, with results suggesting further infill drilling may be warranted to establish a formal resource. The Tinkas Prospect is located approximately 8 kilometres northwest of the Tumas plant area, meaning any future resource development at Tinkas could potentially benefit from proximity to the planned processing infrastructure.

In Western Australia, trade-off studies for the revised Mulga Rock feasibility study continued following successful piloting programs. Recent pilot plant testing confirmed forecast recoveries for all targeted metals including critical minerals and rare earths, while also supporting lower estimated operating costs. The Mulga Rock resource estimate will now be updated using these improved modifying factors, a process that could materially enhance the project's Economics in a revised feasibility study.

Forward Outlook

Deep Yellow enters the second quarter of 2026 with its flagship Tumas project at an advanced stage of pre-construction readiness, a cash balance of A$171.6 million, and a project finance process that has cleared an important technical Due Diligence milestone. The company has been deliberately measured in its approach to FID timing, stating that it will move to a final Investment decision when the uranium market and geopolitical environment support development of a Tier-1 asset. For investors, the key near-term catalysts are the completion of bulk earthworks and commencement of civil construction, the execution of a water Supply agreement with NamWater, and any update on the project financing timeline.

FAQs

Q1: What is the Tumas Project and where is it located?

Tumas is Deep Yellow's flagship uranium development project, located in Namibia approximately 80 kilometres east-southeast of Swakopmund. It holds a granted Mining Lease covering multiple uranium orebodies and is being developed as a conventional uranium mine and processing facility. Namibia is a well-established uranium-producing jurisdiction with a favourable regulatory environment.

Q2: When does Deep Yellow expect to make a final investment decision on Tumas?

Deep Yellow has not set a fixed date for its Final Investment Decision (FID) on Tumas, stating that it will make the decision when the uranium market and geopolitical environment support development. The company's ongoing focus on de-risking the project through detailed engineering, procurement, and early works positions it to move to FID quickly once conditions align.

Q3: How much cash does Deep Yellow have?

Deep Yellow reported a group cash balance of A$171.6 million at 31 March 2026. This balance provides the company with runway to complete pre-construction de-risking activities and advance project financing processes without near-term equity raising pressure.

Q4: What is the Mulga Rock Project?

Mulga Rock is Deep Yellow's uranium project in Western Australia that also contains critical minerals and rare earths. Trade-off studies for a revised feasibility study continued during the March quarter, with recent pilot plant testing confirming forecast recoveries for all targeted metals and supporting lower estimated operating costs. The resource estimate is being updated using improved modifying factors.

Q5: Why did DYL shares rise on 28 April 2026?

DYL shares rose 3.875% to A$2.010 on 28 April 2026 following the release of the company's March 2026 quarterly activities report, which showed material progress across Tumas including 68% engineering completion, 91% bulk earthworks, and progress on project financing. The positive operational update reinforced investor confidence in the company's de-risking trajectory ahead of a potential FID.

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