Tusker Minerals Updates Douala Basin Rutile Exploration Details After ASX Compliance Review

ASX Compliance Review Prompts Revisions to Douala Basin Disclosure

On 17 July 2026, Tusker Minerals released an updated company statement responding to ASX queries about its initial 14 July 2026 announcement titled "Douala Basin Emerges as a Globally Significant Rutile Province." The ASX raised concerns over the suitability of peer project comparisons in Table 4, which juxtaposed early-stage Exploration Targets with more advanced projects featuring Mineral Resources, PFS/DFS studies, or operational status. Additionally, the ASX requested clarification on the language describing the pathway to a maiden JORC resource to ensure alignment with JORC Code standards.

In response, Tusker Minerals opted to remove Table 4 and all related peer comparison commentary entirely, acknowledging that conceptual Exploration Targets cannot be directly compared to Mineral Resources or producing assets. Moreover, the referenced peer projects were situated in different countries (Australia, Malawi, Mozambique), lacking relevant geological, infrastructure, or regulatory parallels to the Cameroon-based Douala Basin project.

Alignment with JORC Code Clause 17 and Enhanced Exploration Disclosure

The original section titled "Clear, Capital-Efficient Pathway to a Maiden JORC Resource" has been substantially revised to comply with Clause 17 of the JORC Code (2012). This clause mandates disclosure of planned exploration activities intended to test the Exploration Target’s validity, along with cautionary statements emphasizing the conceptual nature of the target and the uncertainty of achieving a Mineral Resource estimate. The updated section is included in the revised 17 July 2026 announcement.

This revision provides stakeholders with transparent insight into the exploration methodologies and planned activities for evaluating the Diwong South Deposit within the Douala Basin Project. The cautionary language now clearly states that the Exploration Target is conceptual, that insufficient exploration has been conducted to estimate a Mineral Resource, and that further exploration may not result in a Mineral Resource estimate. This enhances investor understanding of the asset’s development stage and associated execution risks.

Exploration Target Data and Geological Findings Remain Consistent

Despite presentation and compliance updates, Tusker Minerals confirms that all core geological and exploration data from the original announcement remain unchanged. The JORC (2012) Exploration Target of 2.12.6 billion tonnes at 2.12.3% THM for the Diwong South Deposit is still valid, including estimated in situ grades of 0.30.35% rutile and 0.060.07% zircon.

The estimated contained heavy minerals range from 48 to 55 million tonnes, including 7 to 8 million tonnes of rutile and 1.4 to 1.7 million tonnes of zircon, positioning the Douala Basin among the largest emerging undeveloped rutile inventories globally. Reconnaissance drilling results indicating higher-grade near-surface mineralisation—such as intercepts of 3.2 metres at 0.76% rutile and 0.08% zircon from surface, and 4.2 metres at 0.53% rutile and 0.08% zircon from surface with a peak 1.0-metre sample at 0.86% rutile and 0.12% zircon—remain integral to the company’s investment narrative. The geological discovery premise and prospectivity assessment across the 2,580 km Douala Basin Project area remain unaffected.

Rutile-Dominant Titanium Minerals and Kyanite Co-Product Potential

The Douala Basin Exploration Target features a rutile-rich titanium mineral assemblage, with rutile comprising approximately 15% of total heavy minerals—significantly exceeding ilmenite and establishing a high-value mineral sands profile. Rutile’s premium status as a titanium feedstock commands higher prices compared to ilmenite. The presence of substantial zircon credits further enhances economic prospects by diversifying revenue streams across multiple mineral products.

Additionally, the Exploration Target highlights significant kyanite co-product potential, with kyanite estimated to constitute about 70% of the heavy mineral assemblage. While representing a substantial industrial mineral opportunity alongside rutile-zircon operations, no economic value has yet been assigned to kyanite at this stage. Recovery rates, product quality, and market potential require further testwork and assessment. This cautious stance reflects the exploratory nature of the asset and uncertainty regarding kyanite’s commercial viability at the indicated scale and grade.

District-Scale Expansion Potential Within Tusker’s Extensive Cameroon Tenure

The Douala Basin’s district-scale growth potential is a key attraction within Tusker’s broader 2,580 km project area. The current Exploration Target covers approximately 152 km—about 6% of the total project area—leaving multiple prospective zones untested. These remaining areas offer potential for significant upside to the current resource estimate and the discovery of additional mineralisation styles or deposits beyond the existing model.

Initial reconnaissance drilling has identified higher-grade near-surface mineralisation outside the current Exploration Target, indicating the mineralisation system extends beyond defined boundaries. This early drilling supports the prospect of enhanced grades across the wider project footprint. Investors should monitor ongoing exploration as testing of the remaining 94% of the project area progresses, representing critical milestones and potential catalysts for resource upgrades and asset revaluation.

Strategic Infrastructure and Proximity to Port of Douala Enhance Project Viability

The Douala Basin Project benefits from exceptional infrastructure and logistics advantages uncommon for early-stage African mineral sands projects. Its shallow mineralisation and location within a major industrial and transport corridor offer operational benefits. Some project areas lie as close as 10 km from the Port of Douala—a major West African deep-water export facility—facilitating efficient shipping of mineral products to global markets. Additionally, extensive licence zones are within 255 km of established roads, grid power, skilled labour, and international airports.

These infrastructure assets materially improve the project’s economic viability and development timeline by reducing capital and operating costs compared to remote greenfield sites. Proximity to transport networks and power lowers the need for extensive infrastructure investment. The nearby port minimizes long-haul transport needs and provides direct access to maritime export channels serving titanium and specialty mineral markets. These advantages translate into meaningful operating cost reductions and enhanced project economics relative to competitors in less developed regions.

Global Rutile Mineral Sands Market Context and Competitive Position

Renewed interest in rutile-zircon mineral sands exploration follows a period of underinvestment in the titanium mineral sector. Rutile is a premium titanium feedstock used in pigments, welding electrodes, aerospace coatings, and ceramics. Global rutile production is concentrated in few mines and jurisdictions, causing supply constraints and supporting elevated prices for high-grade rutile ore. The Douala Basin’s estimated 7 to 8 million tonnes of rutile metal equivalent places it among the world’s largest undeveloped rutile deposits.

Tusker’s description of the Douala Basin as "one of the most significant new rutile-bearing mineral sands discoveries in recent decades" underscores the scale and quality of its rutile inventory compared to recent discoveries and operating mines. The rutile-rich mineral assemblage, with rutile at 15% of heavy minerals and exceeding ilmenite, distinctly differentiates the deposit from many mineral sands systems dominated by ilmenite. For investors focused on titanium minerals and emerging resources, the Douala Basin offers a potentially transformative asset within Tusker’s portfolio.

Exploration Risks and Resource Definition Challenges for Early-Stage Projects

Despite the significant conceptual Exploration Target, investors should recognize inherent uncertainties with early-stage exploration assets. The amended announcement emphasizes the conceptual status of the Exploration Target, insufficient exploration to define a Mineral Resource, and uncertainty whether further work will yield a Mineral Resource estimate. This caution reflects that Exploration Targets, though geologically informed, are preliminary and subject to revision as new data emerges.

Advancing from Exploration Target to Mineral Resource requires substantial investment in drilling, metallurgical testing, geotechnical studies, and economic evaluations. Outcomes may not validate current assumptions. Geological variability, metallurgical challenges, or regulatory changes could materially impact asset prospects and economics. Investors should consider these technical and execution risks and maintain realistic expectations regarding timelines and costs to progress toward production.

Board Approval and Contact Information for Further Inquiries

The revised announcement has been authorised by the Board of Tusker Minerals Ltd, confirming governance oversight and approval of the updated disclosures. This ensures directors have reviewed and endorse the accuracy and compliance of the information presented.

For additional details on the amended announcement or the Douala Basin project, contact Executive Chairman Mr Daniel Smith at [email protected] or CEO Mr Cliff Fitzhenry at [email protected]. The company’s registered office is Ground Floor, 8 St Georges Terrace, Perth, Western Australia 6000. More information is available at tuskerminerals.com or by calling +61 8 9486 4036.