--- title: "Porotillo Surface Intersection Grows Mineralisation for Sunstone Metals, Drilling and Scoping Study Advance" type: "News" locale: "en" url: "https://longbridge.com/en/news/278627770.md" description: "Sunstone Metals has reported a significant 462-meter surface trench intersection at its Porotillo prospect, enhancing mineralisation and supporting the Bramaderos exploration target. The trench PO-5 returned 462.22m at 0.55 g/t AuEq, with higher-grade intervals. A second drill rig is set to accelerate resource definition, while metallurgical testwork and scoping studies are underway. Sunstone raised $8 million in December 2025 to advance the project. However, investors should be aware of risks related to funding, exploration, and commodity price fluctuations." datetime: "2026-03-10T23:43:44.000Z" locales: - [zh-CN](https://longbridge.com/zh-CN/news/278627770.md) - [en](https://longbridge.com/en/news/278627770.md) - [zh-HK](https://longbridge.com/zh-HK/news/278627770.md) generator: "portal-rs" --- # Porotillo Surface Intersection Grows Mineralisation for Sunstone Metals, Drilling and Scoping Study Advance Sunstone Metals has reported a significant 462-meter surface trench intersection at its Porotillo prospect, expanding mineralisation and reinforcing the Bramaderos exploration target. The recent trenching results from **Porotillo** highlight a substantial intersection, with trench **PO-5** returning **462.22m** at **0.55 g/t AuEq**, comprising **0.36 g/t gold**, **0.11% copper**, and **1.43 g/t silver**. Within this broad intersection, higher-grade sub-intervals included **194.90m** at **0.67 g/t AuEq** (**0.46 g/t gold**, **0.12% copper**, **1.96 g/t silver**) and **153.02m** at **0.60 g/t AuEq** (**0.38 g/t gold**, **0.13% copper**, **1.31 g/t silver**). This significant find at **Porotillo** remains open on all sides, confirming the continuity of gold-copper-silver mineralisation. Earlier trenching results from **Porotillo** had also indicated promising grades, with one reporting **29m** at **0.91 g/t AuEq** and another **22m** at **1.19 g/t AuEq**. **Bramaderos Target Bolstered** The latest results from **Porotillo** serve to enhance the conceptual \*\*Bramaderos \*\*target, which is estimated at **135–180 million tonnes** (Mt) grading between **0.25–0.40 g/t AuEq**, for a total of **1.7–3.5 million ounces AuEq**. This exploration target is distinct from the established **Bramaderos Mineral Resource**, which, as of the **November 2025 Mineral Resource Estimate**, stands at **220 Mt** at **0.50 g/t AuEq** for a total of **3.6 Moz AuEq**. The potential for additional resources at **Porotillo** adds to the overall prospectivity of the **Bramaderos** project. The **Bramaderos Concession** is part of a joint venture, with **Sunstone Metals** holding an **87.5%** ownership interest. The remaining **12.5%** is held by **SolGold**, with their share loan carried. **Drilling and Scoping Study Advance** To accelerate resource definition, a **second drill rig** is arriving on site. This additional capacity will support ongoing drilling efforts at the **Copete-Porotillo** area. The primary aim is to convert the identified exploration targets into JORC-compliant resources. Drilling is already progressing at **Copete-Porotillo**, with the company also evaluating other exploration targets within the extensive **Bramaderos** concession. Complementing the exploration activities, **metallurgical testwork** and **mining scoping activities** are currently underway. These studies are crucial for supporting the project's economic assessment and de-risking future development. **Context of Project Development** **Sunstone Metals** has been actively progressing its **Bramaderos** project, successfully raising **$8 million** in \*\*December 2025 \*\*through a share placement. These funds were specifically allocated to advance the **Bramaderos Scoping Study** and to accelerate the drilling programmes. Further corporate activity saw a **30-for-1 share consolidation** proposed in **January 2026**, intended to simplify the capital structure and enhance the company's appeal to a broader investor base while supporting ongoing capital management. Previous exploration efforts in **February 2026** had already highlighted the discovery of **high-grade surface mineralisation** at **Porotillo**. These earlier findings strongly supported the potential for expanding the **Bramaderos** resource base. **Outlook and Risks** **Sunstone Metals'** latest surface results from **Porotillo** significantly expand the known mineralisation and bolster the **Bramaderos Exploration Target**. With drilling intensifying and a scoping study advancing, the company is positioned for potential resource growth. However, investors should remain aware of inherent risks. **Funding constraints** could potentially impact the pace of drilling and the completion of the scoping study, while there is also **exploration risk** involved in converting conceptual targets into mineable resources. Furthermore, the **execution risk** associated with ambitious exploration and development programmes needs careful management. Future developments will also be influenced by **commodity price** fluctuations. ### Related Stocks - [STM.AU](https://longbridge.com/en/quote/STM.AU.md) - [STN.AU](https://longbridge.com/en/quote/STN.AU.md) ## Related News & Research - [Sunstone Metals Extends Known Mineralisation at Bramaderos Gold-Copper Project](https://longbridge.com/en/news/296170325.md) - [Shaw and Partners Reaffirms Their Buy Rating on Sunstone Metals Limited (AL9)](https://longbridge.com/en/news/296384383.md) - [Saturn Metals Secures Key Licences at Aquarius Gold Prospect](https://longbridge.com/en/news/293675079.md) - [Sunstone retracts Bramaderos forecasts after ASX scrutiny](https://longbridge.com/en/news/285873131.md) - [Shaw and Partners Reaffirms Their Buy Rating on Sunstone Metals Limited (AL9)](https://longbridge.com/en/news/286715049.md) --- > **Disclaimer: This article is for reference only and does not constitute any investment advice.**