Estrella Resources Deploys UAV Survey to Probe Deep Extensions at Ira Miri

Advanced UAV Survey Targets Deep Manganese Extensions

Estrella Resources Limited (ASX:ESR) has kicked off a state-of-the-art MobileMTd UAV passive electromagnetic survey over its Ira Miri manganese deposit in Timor-Leste. This survey aims to test deeper and lateral extensions of the known mineralised system, potentially revealing a larger orebody beyond the current pit boundaries. The technology, developed by Expert Geophysics, promises imaging depths between 500 and 800 metres; significantly deeper than previous ground-based surveys.

The survey follows Estrella’s recently completed Category B market appraisal extraction programme, which defined a Stage 1 stockpile of 27,371 tonnes at a weighted average grade of 28.64% manganese, with in-situ samples reaching up to 60.22% Mn. This bulk sampling confirmed structurally complex, high-grade mineralisation extending to the pit floor and walls, underscoring the deposit’s quality and continuity. This milestone was detailed in the company’s prior 27,371 Tonne High-Grade Manganese Stockpile at Ira Miri announcement.

MobileMTd Technology and Survey Advantages

MobileMTd is a next-generation UAV-deployed passive electromagnetic system that collects near-continuous data with approximately 5-metre sampling intervals. Unlike traditional ground-based induced polarisation (IP) surveys, which rely on discrete measurement points and have limited depth penetration, MobileMTd uses naturally occurring electromagnetic fields to image subsurface resistivity and structural features at high spatial resolution. This enables the mapping of geological structures and mineralisation continuity both laterally and at depth, even in rugged terrain.

Previous ground IP surveys at Ira Miri had identified several deeper anomalies beneath and adjacent to the pit, but their extent and geometry remained uncertain due to depth limitations. The MobileMTd survey is designed to overcome these constraints, providing a more comprehensive subsurface picture to guide future drilling and resource modelling.

Survey Scope and Strategic Objectives

The survey covers the existing pit area and extends approximately five kilometres along strike, targeting known mineralisation and adjacent structural corridors identified from prior geological and geophysical work. Its objectives include investigating the geometry and continuity of the manganese system, ranking deeper IP anomalies for drill prioritisation, and assessing MobileMTd’s potential as a regional exploration tool.

Results are expected within six to eight weeks post-acquisition and will underpin follow-up reverse circulation and diamond drilling campaigns. The data will also support Estrella’s planned application for a Category A Mining Licence, a key step towards full-scale mining operations.

Concurrent Project Developments and Outlook

While the survey progresses, Estrella is advancing shipment preparations and export approvals for its Category B manganese stockpile. IMSBC Code testing is slated for late May, with a formal Expression of Interest sale process to commence in early June. These commercial moves align with the company’s broader strategy to transition from appraisal to production.

In parallel, Estrella recently announced a substantial maiden JORC limestone resource at its Werumata project in Timor-Leste, with 621 million tonnes reported. This adds a significant new dimension to the company’s portfolio and complements its manganese ambitions, as highlighted in the 621Mt inferred limestone resource at Werumata update.

Managing Director Chris Daws expressed enthusiasm for the MobileMTd survey, noting its suitability for extending geological models and targeting depth extensions of manganese ore. He also highlighted ongoing progress with the manganese shipment and the Werumata limestone resource, signalling a period of accelerated activity for Estrella.