Image source: © 2025 Krish Capital Pty. Ltd.

Highlights

  • Tesoro Gold’s share price rose 7.41% to AUD 0.029 per share on 10 July following encouraging surface sampling results.

  • Assays from the La Brea target at El Zorro returned gold grades of up to 22.10 g/t Au.

  • Four major mineralised trends, up to 200m wide and 4km long, identified at La Brea, highlighting large-scale gold potential.

     

Tesoro Gold Limited (ASX:TSO) has announced significant assay results from its La Brea target, part of the El Zorro Gold Project in Chile, propelling its share price up by 7.41% to AUD 0.029 per share on Thursday morning.

The recent exploration work, comprising detailed mapping and systematic outcrop channel sampling, has revealed a potentially large-scale gold system at La Brea, located around 15 kilometres north of the company’s 1.5 million-ounce (unconstrained) Ternera Gold Deposit.

High-Grade Surface Sampling Confirms Mineralisation

A total of 317 surface samples were collected across the La Brea prospect, returning widespread outcropping gold mineralisation. The gold is associated with northwest-trending fault zones and alteration zones adjacent to the La Isla granodiorite intrusion, a geological feature with similarities to the El Zorro Tonalite intrusions at Ternera.

Among the standout assay results were:

  • 1.00m @ 22.10 g/t Au (EZTR005000)

  • 1.00m @ 11.80 g/t Au (EZTR005065)

  • 1.00m @ 10.45 g/t Au (EZTR005253)

  • 4.00m @ 4.85 g/t Au (EZTR005259)

Approximately 40% of all samples (128 samples) returned gold values above 0.10 g/t Au, indicating the extensive nature of mineralisation across the area.

A Large-Scale Target in the Making

Tesoro has outlined four major northwest-trending mineralised structures, each extending up to 4 kilometres in length and 200 metres in width. The magnitude and consistency of the gold distribution position La Brea as a potentially significant addition to the broader El Zorro Gold corridor.

The La Isla intrusion, which hosts the observed gold mineralisation, is believed to be geologically related to the El Zorro Tonalite — the main host rock for gold at Ternera.

Next Phase: Trenching and Drilling

The company has initiated a trenching program aimed at further defining the mineralised zones ahead of maiden drilling, which is scheduled to begin in the coming months. Access tracks are currently being developed, and additional geological mapping is underway to finalise initial drill locations.

Tesoro’s ongoing exploration success at La Brea is part of its broader strategy to expand the El Zorro project, which continues to yield promising results.

With La Brea’s geological similarities to the flagship Ternera Deposit and its scale potential, the site is expected to be a key focus of exploration and resource development activity through the remainder of 2025.