Key Highlights

  • Estrella Resources (ASX:ESR) announced a maiden 621Mt JORC Inferred Resource at the Werumata Limestone Project.
  • The resource includes multiple limestone products suitable for industrial and infrastructure uses.
  • The company said drilling has only tested a small portion of the broader concession area.
  • Werumata hosts material suitable for acid neutralisation, cement applications and road construction uses.
  • Estrella is advancing sales discussions, port access negotiations and future drilling plans in Timor-Leste. 

Estrella Resources (ASX:ESR) provided investors with a major project update on Thursday after unveiling a maiden JORC Inferred Mineral Resource at its Werumata Limestone Project in Timor-Leste.

The company’s shares finished unchanged at AUD0.036 on 14 May 2026 following the announcement, which detailed a central estimate resource of 621 million tonnes of limestone across multiple industrial product categories.

While the market reaction remained subdued during the session, the announcement marked a significant milestone for the company as it seeks to establish Werumata as a large-scale limestone development and export project within Southeast Asia.

Management framed the maiden resource as an important foundation for Long-term Growth, while also pointing to substantial exploration upside given that only a small section of the concession has been drill tested to date.

Maiden resource spans multiple industrial products

The Werumata resource estimate includes three distinct product streams based on limestone quality and composition.

Product 1 comprises high-grade limestone suitable for use as an acid neutralisation agent, with a central estimate of 493 million tonnes averaging an acid neutralisation capacity of 83.2%.

Product 2 contains lower-grade limestone suitable for industrial applications such as masonry mortar, AAC blocks and cement, with a central estimate of 33 million tonnes.

Product 3 includes high-silica material intended for road paving, construction aggregate, road base and rock Fill applications, with an estimated 95 million tonnes averaging silicon dioxide content of 58%.

The company stated that all three product categories are considered direct shipping ores requiring only crushing and screening without additional metallurgical processing.

For investors, direct shipping potential can sometimes reduce project complexity and lower processing infrastructure requirements compared with projects requiring more intensive beneficiation.

Resource remains open with further drilling planned

According to Estrella, the current drilling program has tested only a limited portion of the concession area near the western boundary, while limestone mineralisation extends more than six kilometres eastward across the broader project tenure.

The concession covers approximately 4,990 hectares within the Lautém Municipality of Timor-Leste. Management highlighted the scale of the concession and untested mineralisation as key indicators of future resource expansion potential.

The company also confirmed preparations are underway for a new drilling campaign aimed at expanding the resource base and potentially improving classification confidence over time.

The maiden resource currently sits within the Inferred category under the JORC Code, meaning additional drilling and density sampling will likely be required before higher-confidence classifications such as Indicated or Measured can be established.

Infrastructure and export strategy become focus areas

Estrella highlighted the project’s logistical positioning as part of its broader development narrative.

Werumata is located approximately 170 kilometres east-northeast of Timor-Leste’s Capital Dili and is accessible via sealed all-weather roads. The company also pointed to potential export opportunities through coastal shipping infrastructure.

Management said discussions regarding port access are underway with the Timorese Government, while broader sales discussions are also progressing.

The focus on export logistics reflects the importance of infrastructure access for bulk Commodity projects, particularly those targeting regional construction and industrial markets across Southeast Asia.

Managing Director Chris Daws described the maiden resource as an exceptional starting point and said the project could evolve into a significant large-scale limestone operation supported by growing regional infrastructure Demand.

Geology supports large-scale mineralised system

The project’s mineralisation is hosted within two principal limestone formations: the Baucau Limestone Formation and the underlying Batu Putih Chalk.

According to the company, the Baucau Limestone formed within shallow marine environments and contains coralline reef facies and related sedimentary units. The Batu Putih Chalk formed in deeper marine conditions and contributes additional limestone thickness within the system.

The geological scale and continuity of these formations underpin the broader resource estimate and may support future expansion if ongoing drilling continues to validate mineralisation across the concession.

About the Company

Estrella Resources (ASX:ESR) is an Australian-listed exploration and development company with projects spanning critical minerals and industrial commodities. The company is currently advancing the Werumata Limestone Project in Timor-Leste through resource definition and development planning.

Industry trends and market context

Industrial limestone demand remains closely linked to infrastructure activity, construction growth and industrial processing requirements across regional economies. Limestone products are widely used in cement production, road construction, environmental remediation and industrial Manufacturing applications.

Infrastructure development across Southeast Asia has continued to support long-term demand projections for construction materials and industrial mineral Supply chains. Companies with access to scalable resources and export infrastructure may benefit from these broader trends.

At the same time, bulk commodity development projects remain sensitive to logistics costs, infrastructure access, permitting frameworks and long-term regional demand conditions.

Investment risks and challenges

Despite the scale of the maiden resource, Estrella Resources remains exposed to several development and market risks. The Werumata resource currently remains within the Inferred classification category, meaning additional drilling and technical work will be required before greater resource confidence can be established.

The company also faces infrastructure, logistics and permitting risks associated with developing a bulk commodity export project in Timor-Leste. Future commercial outcomes will depend on successful port access arrangements, customer demand, transport Economics and broader funding availability.

From a bullish perspective, investors may view the scale of the maiden resource and untested exploration upside across the concession as supportive long-term growth factors. From a bearish perspective, the project remains at an early development stage and will still require substantial technical, commercial and logistical progress before economic viability can be fully assessed.