--- title: "Sunstone Metals Intersects Wide Gold-Copper Zones at Porotillo, Boosting Resource Potential" type: "News" locale: "en" url: "https://longbridge.com/en/news/288341747.md" description: "Sunstone Metals (ASX: STM) reported significant gold-copper drill results at its Porotillo prospect, intersecting 200m and 151m from surface. These findings extend mineralization to 480m southeast, supporting the strategy to upgrade the Copete-Porotillo exploration target into JORC Mineral Resources by late 2026. This follows a previous retracted scoping study, with current infill drilling aimed at converting Inferred resources to Indicated status for future economic studies." datetime: "2026-06-02T00:16:49.000Z" locales: - [zh-CN](https://longbridge.com/zh-CN/news/288341747.md) - [en](https://longbridge.com/en/news/288341747.md) - [zh-HK](https://longbridge.com/zh-HK/news/288341747.md) generator: "portal-rs" --- # Sunstone Metals Intersects Wide Gold-Copper Zones at Porotillo, Boosting Resource Potential Sunstone Metals (**ASX: STM**) has released significant gold-copper drill results from its **Porotillo** prospect within the **Bramaderos** project, intersecting **200m** and **151m** from surface. These results extend known mineralisation and bolster the company's strategy to upgrade the **Copete-Porotillo** exploration target into **JORC Mineral Resources** in the **second half of 2026**. Hole **PTDD006** returned **200m at 0.62 g/t Au-Eq** (0.38 g/t Au, 0.14% Cu) from surface, including a higher-grade interval of **19m at 1.01 g/t Au-Eq** (0.77 g/t Au, 0.15% Cu) from surface. Hole **PTDD007** also intersected **151m at 0.54 g/t Au-Eq** (0.34 g/t Au, 0.12% Cu) from surface, including **26m at 0.84 g/t Au-Eq** (0.53 g/t Au, 0.19% Cu) from surface. These latest intercepts extend gold and copper mineralisation an additional **380m** to the southeast of prior hole **PTDD004** to now cover a total length of **480m**. **Supporting Resource Upgrade Strategy** The ongoing drill program is integral to **Sunstone Metals**' broader strategy. The results specifically support the company's plan to convert the conceptual **Copete-Porotillo** exploration target into **Mineral Resources** during the **second half of 2026**. An expanded **Porotillo** trenching program is also underway aiming to improve surface definition and cost-effectively supplement drill data, aiding the anticipated resource update. Significantly, all **12 assayed holes** in the current drilling program have returned long gold-copper mineralised intersections. These discoveries lie outside the existing **3.6Moz Bramaderos Mineral Resource**, indicating strong potential for growth. **Prior Scoping Study Issues** **Sunstone Metals** previously made headlines when it retracted its **Bramaderos Scoping Study** following an **ASX** advisory that the company lacked a reasonable basis for its production targets and financial forecasts, primarily due to a reliance on **Inferred Resources**. In response, the company is now focusing intensely on converting **Inferred resources** to **Indicated resources** through targeted infill drilling. This work is crucial for future optioneering studies and to establish a more robust resource base. An updated **Bramaderos Mineral Resource** estimate is anticipated later in **2026**, which will be a key milestone for **Sunstone Metals**. **Exploration Target Details** The **Copete-Porotillo** exploration target is estimated to contain between **135-180Mt** at a grade of **0.40-0.60 g/t AuEq2**, equating to **1.7-3.5Moz AuEq1**. The company has previously cautioned that Exploration Targets are conceptual in nature and that the conversion of these targets to **Mineral Resources** remains uncertain. Previous drilling efforts at the **Melonal** prospect, another part of the **Bramaderos** project, also yielded wide mineralisation. For instance, hole **MEDD003** intersected **250m at 0.43 g/t AuEq** from surface. **Sunstone's Resource Ambitions** **Sunstone Metals** continues to demonstrate broad gold-copper mineralisation at **Bramaderos**, with recent results from **Porotillo** supporting its resource expansion strategy. While progress is being made towards a **2H 2026** resource update, the shadow of the retracted scoping study means investors will be looking for concrete evidence of resource conversion and credible economics in future studies. ### Related Stocks - [STM.AU](https://longbridge.com/en/quote/STM.AU.md) ## Related News & Research - [Sunstone Metals Extends Known Mineralisation at Bramaderos Gold-Copper Project](https://longbridge.com/en/news/296170325.md) - [Paterson Resources to Launch Major Drilling Campaign at Grace Gold Project](https://longbridge.com/en/news/298148412.md) - [Vior Gold outlines Ligneris project drilling and exploration targets in corporate presentation](https://longbridge.com/en/news/297802176.md) - [Sterling Increases Strike of MEPS Discovery to 1.3km and Discovers Molybdenum-Copper Porphyry Stock at Depth | SAGGF Stock News](https://longbridge.com/en/news/297907739.md) - [Terra Rossa Gold starts drilling at Vetas gold project in Colombia](https://longbridge.com/en/news/297782205.md) --- > **Disclaimer: This article is for reference only and does not constitute any investment advice.**