About Us

Who We Are

Sumbawa Timur Mining (STM) is a privately-owned joint venture company driven by the motivation to expand Indonesia's copper reserves through comprehensive exploration efforts.

We call this exploration project the Hu'u Project. The Hu'u Project is STM's sole exploration project and spans across Dompu Regency and Bima Regency, West Nusa Tenggara. STM is the owner of a 7th generation Contract of Work and is the holder of a geothermal exploration license.

80%

STM is 80% owned by Eastern Star Resources Pty. Ltd., a 100% owned subsidiary of Vale Holding B.V.

20%

The remaining 20% is owned by PT Antam Tbk.

In 2013, STM discovered the Onto Deposit within the mountainous terrain in the Contract of Work. The deposit is administratively located in Hu'u District (Dompu Regency). The Onto deposit is a Tier-1, world-class deposit and is one of the most significant global copper discoveries in the last 20 years.

The Hu’u Project is at the pre-feasibility study stage of development with an extensive exploration program underway to ensure the technical, social, environmental and financial viability of the project. This effort will continue over the coming years, reflecting our commitment to seeing the Onto Deposit become a world-class mining operation.

STM’s core value is ‘Life Matters Most‘ and guides every decision we make. To uphold this value, we have instituted robust procedures that prioritize the safety of our personnel, utilize safe work methods and provide industry-leading protective equipment across all our operational sites.

Our Vision

A world-class copper mining operation supported by renewable energy.

Our Mission

Develop the Hu’u Project as a model for sustainable development and enduring prosperity for all stakeholders.

Build a solid foundation recognized by society for setting a benchmark for safety, demonstrate best-in-class reliability, use the best talent available, and support Indonesia’s downstream copper industry.

Company's Value

Life Matters
Most

Life Matters Most We believe that life is more important than material gain, and we incorporate this vision into all our business decisions.

Trust and Be
Trusted

Trust and Be Trusted STM comprises a diverse range of individuals with various expertise, making it fundamental to trust each other’s abilities and to complement each other to achieve corporate goals.

Act with
Integrity

Act with Integrity We build relationships based on trust, open and transparent communication, respect, and integrity.

Support Others and
Be Supported

Support Others and Be Supported We believe in helping each other and being open to receiving help. No one can do everything alone, and mutual support is the way to achieve common goals.

Communication and
Coordination

Communication and Coordination We encourage open communication and the sharing of ideas, which can then integrate our efforts to achieve organizational goals.