Orosur Mining Inc. (TSXV/AIM: OMI), a minerals explorer and developer operating in Colombia and Argentina, has published an operational update for its Anzá Project in Colombia, announcing new high-grade drill results at the APTA prospect alongside significant strategic progress across three exploration targets. Hole MAP110 returned a standout interval of 43.55 metres at 1.53 g/t gold, including 14.2 metres at 3.1 g/t gold, while the company confirmed that APTA will transition to a formal resource drill-out programme. Investors will be watching progress across the APTA, Pepas, and El Cedro/El Yarumo cluster as the company accelerates activity with three drill rigs currently operating on site.

Key Points

  • Orosur Mining Inc. (TSXV/AIM: OMI) — minerals explorer and developer focused on Colombia and Argentina
  • APTA hole MAP110 returned 43.55m at 1.53 g/t gold, including 14.2m at 3.1 g/t gold; APTA to transition to resource drill-out programme
  • Pepas advancing to Preliminary Economic Assessment (PEA) stage; conceptual base case of 500 tonnes per day outlined in PTO documentation
  • Investors should watch for the APTA resource drill-out commencing early in the new year and El Yarumo drilling targeted for Q1 2027

APTA Drill Results: MAP110 Delivers 43.55m at 1.53 g/t Gold Ahead of Resource Drill-Out

The APTA prospect, which has seen over 40,000 metres of drilling since 2012, continues to yield encouraging intersections. Hole MAP109 returned 15.35 metres at 0.97 g/t gold, while MAP110 delivered 43.55 metres at 1.53 g/t gold, including a higher-grade sub-interval of 14.2 metres at 3.1 g/t gold. The announcement states that both holes have added to geological understanding of the deposit. Following completion of the current hole MAP111, drilling at APTA will be temporarily suspended to allow planning for a formal resource drill-out programme, which the company anticipates will commence early in the new year, targeting the highest-grade zones to achieve sufficient resource confidence.

Pepas Prospect Moves Toward PEA as South Pepas Targets Open New Drilling Opportunities

Following consultation on its Programa de Trabajos y Obras (PTO), Orosur has confirmed that Pepas will advance to a Preliminary Economic Assessment stage, compliant with NI43-101. The PTO is based on a conceptual mining case of 500 tonnes per day, equating to approximately 175,000 tonnes per year, with potential production of approximately 25,000 ounces of gold per year over ten years. The company notes that Pepas material could be blended with surrounding lower-grade material outside the existing Mineral Resource Estimate. Meanwhile, land access agreements have been completed for South Pepas targets, with a highly prospective position roughly 800 metres south of the deposit — where rock chip samples have returned multiple grams per tonne gold — targeted for drilling in coming weeks.

El Cedro Redrilling Progresses Beyond 200m as El Yarumo Emerges as High-Priority Target

Redrilling of hole CED001A at El Cedro is progressing beyond the previous failure depth of 267 metres, with core recovery having recommenced from 200 metres downhole following a slight deviation from the original trajectory. The company is also examining a potential second drill pad positioned directly over the El Cedro intrusive system, where old artisanal shafts have recorded grades of up to 8 g/t gold. Approximately 2.4 kilometres northwest of El Cedro, the newly defined El Yarumo target has returned surface samples up to 10.67 g/t gold across a mapped corridor exceeding 500 metres strike length, with geological similarities noted to the Marmato deposit. Drilling at El Yarumo is targeted for Q1 2027, subject to rig and crew availability.

Colombia's New Mining Administration and Balance Sheet Position Shape Orosur's Development Outlook

The announcement highlights that a new Colombian government administration was established in early August, bringing fresh leadership to the relevant mining ministries. The company states it intends to present its PTO to these new authorities and discuss development options aligned with the administration's sectoral vision. CEO Brad George is quoted in the announcement noting that a solid balance sheet supports the company's ability to advance both Pepas development and APTA resource definition concurrently. Investors should note that the company's own disclosures identify going-concern risk, with continuance dependent on obtaining adequate financing — a material consideration as the multi-prospect programme expands.