ESG Certification

Independent, third-party review of our ESG and sustainability practices and objectives is a key component of our commitment to creating long-term value for all our stakeholders through integrating ESG best practice into the ongoing development of the Company.

Since 2021, Marimaca has completed an annual independent ESG performance assessment via the Digbee ESG reporting framework, to evaluate Company and project ESG credentials. The Digbee framework assessment includes the completion of a set of comprehensive corporate and project questionnaires appropriate to the scope of the Marimaca project and mapped to key Global Standards. The assessment required the provision of relevant corporate and project data, narrative and supporting evidence. Our disclosure was board-approved prior to submission and assessed by independent mining ESG experts to produce an impartial rating, resulting in a specific ESG certification. Scores are also peer-reviewed as part of the assessment, to ensure accuracy and credibility.

 Some of the global standards Digbee aligns to

For 2025, we are proud to have achieved a score of A within a range of B to AAA. This reflects our ongoing commitment to improving our ESG metrics. In 2021, we received a score of BB, which improved to BBB in 2022, and now to a sustained A. Many of our projects and corporate scores were ranked at A or higher. Full details of the report can be found here“.

Overarching positive conclusions drawn from the 2024 assessment:

1. The Company submitted the Environmental Impact Declaration (DIA) in January 2025 and has received comments to which it will respond by mid-year 2025. This is one of the entry routes to a full Environmental Impact Assessment System (SEIA) which will be completed in the future. The project Definitive Feasibility Study has commenced.
2. Risk management is integral to strategy and decision making. The Environmental Analysis report, addressing Environmental Risks, is very thorough and represents a substantial effort to proactively consider environmental risks. • The Company has found several innovative solutions to reduce the environmental footprint of the operation, such as utilising recycled cooling seawater from a nearby electricity plant for mining and processing operations which will eliminate the need for groundwater abstraction, and designing an ore process that will not require a tailings facility.
3. The project is a Chilean based copper oxide exploration project located in the region of Antofagasta, a world[1]renowned copper district, benefitting from easy access to suitable infrastructure such as ports, highways, airports, power supply, and the robust skillset of the local population.
4. This is the fourth year that the Company has been reviewed using the Digbee framework, indicating a strong commitment to ESG and continued transparency in governance practices.
5. The majority of the workforce is drawn from the local population, within the Antofagasta region and northern Chile. In the future, the Company expects to employ 95% of its workforce from the local area thanks to the availability of experienced local skilled people due to the long history of mining in the area.
6. Risk management is integrated across the organisation, and is used to support decision making at a senior level.
7. The Board has a diverse skill set relating to finance, government relations, accounting, and mining, and is well equipped and experienced to successfully progress the project from exploration to development.
8. The Company is not reliant on groundwater for current or anticipated future use, ensuring what scarce continental water is available can be drawn by the local population.
   Currently the overwhelming majority of goods and services are locally procured.