At ATEX, sustainability underpins our business strategy and operations across the territories where we operate.

We are committed to responsible environmental, social and governance (ESG) performance that strengthens trust and creates long-term value.

Our Purpose & Values

We seek to responsibly explore, define and consolidate a large-scale, high-grade copper-gold district in Chile, with the aim of contributing meaningfully to local and national development, supporting the transition to a more sustainable, lower-carbon economy, and generating long-term value for our shareholders.

The principles that guide our decisions and actions are:

Safety

We prioritize the well-being of our employees and contractors while minimizing our environmental footprint through strong safety practices and responsible operations.

Collaboration

We foster constructive, mutually beneficial relationships with our stakeholders, grounded in trust, respect, and open cooperation.

Transparency

We communicate clearly, consistently, and responsibly to build and maintain relationships based on trust and accountability.

Excellence

We aim to operate as a world-class mining exploration company, applying discipline and continuous improvement in all aspects of our work.

Our Five Pillars of Sustainability

Our ESG approach is structured around five pillars.

1. Health & Safety

Health and safety are at the heart of our corporate identity, safeguarding our employees, communities, and stakeholders.

In 2025:

  • We held our first Safety Week.
  • We maintained zero fatal and lost- time injuries across 486,551 total working hours.
  • We delivered 7,446 hours of formal safety training.
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Total working hours in 2025

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Safety training hours in 2025

2. Governance

Our governance framework is designed to ensure we advance the Valeriano Project responsibly in accordance with regulatory, political, and socio-environmental policies.

In 2025:

  • We continued strengthening the principles, structures, processes and management systems that guide how we work.
  • We further embedded environmental, social, and governance (ESG) criteria into our decision-making processes.
  • We held 25 Board meetings.
  • Women represented 33% of Board composition
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Board meetings held in 2025

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Female board representation in 2025

3. Environment

We conduct our exploration activities in a responsible manner with focus on minimizing our environmental footprint.

In 2025:

  • We prepared our Environmental Impact Assessment (EIA)
  • We deployed 30+ monitoring sensors across air, water, and glacier components.
  • We conducted our first GHG emissions inventory and advanced a comprehensive biodiversity baseline study.
  • We consumed a total of 55,198 m³ of water.
  • No environmental incidents requiring regulatory notification were recorded.
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Monitoring sensors deployed in 2025

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Hectares environmentally characterized

4. Community Relations

We are committed to building and maintaining relationships based on trust, transparency and respect, and to contributing to sustainable development throughout the territories where we operate.

In 2025:

  • We completed our Early Citizen Participation (ECP) process for the Environmental Impact Asessment (EIA): more than 150 participants in 3 open houses and 10 group meetings.
  • We expanded engagement across the full El Tránsito Valley: 297 formal visits.
  • We strengthened workforce skills among members of neighboring communities.
  • We promoted employment continuity for local workers during the winter season, when exploration activities are suspended.
  • We supported a dental care campaign in all schools and two kindergartens in the El Tránsito Valley and provided Starlink connectivity in remote communities.
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Community engagement visits in 2025

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Beneficiaries of the training program to date (2025)

5. Our People

We are committed to building a workforce that is highly skilled, inclusive, and aligned with the values that define our operations.

In 2025:

  • Approximately 47% of our workforce resided in Alto del Carmen and Vallenar, supporting local employment and development.
  • Indigenous representation across our team stood at 22%, reflecting our commitment to building a workplace that is rooted in the communities where we operate.
  • Women represented 36% of our team, exceeding the Chilean mining industry average of 24%.
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Local workers in 2025

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Hectares environmentally characterized

All figures reported as of December 31, 2025, and detailed in our 2025 Sustainability Report, available for download here.

Sustainability Report