Analyst Comment9 Jun 2026 15:15
Orosur Mining* (OMI LN) 21p, Mkt Cap £76m – APTA assays boost prospectivity with three key target zones identified for follow-up drilling
• Orosur Mining reports assay results from APTA in Colombia.
• APTA has seen 39,000m of drilling to date, identifying a significant epithermal gold system.
• Following the delivery of the Pepas MRE, Orosur has turned to other prospects, including a reassessment of the APTA mineralisation.
• This reassessment outlined a thesis suggesting gold mineralisation is controlled within silicified sediments and volcaniclastics bound by two large faults.
• Orosur has now drilled a new hole to intersect the footwall zone to target shallower mineralisatoin.
• This returned:
1. MAP106A: 229.7m at 0.88g/t Au from 190m (inc. 6.85m at 2.15g/t Au from 212m, 59.2m at 2.02g/t Au from 292m, 7.7m at 7g/t Au from 316m and 4.7m at 3.95g/t Au from 346m)
• Gold mineralisation was intersected almost immediately in the footwall zone at a vertical depth of 70m.
• Several high-grade intersections were recorded through the hole.
• The team continues develop their understanding of the APTA geology, but suggests controls of high-grade gold relate to ‘various phases of silicification … within the volcaniclastic core.’
• The hole has revealed three key findings:
1. Increased scale and grade potential at depth
2. Increased bulk tonnage potential near surface, set to be explored with a shallow drilling programme
3. A high-grade mineralised vein with reasonable continuity warranting follow-up drilling.
• Orosur has now identified three areas of prospectivity at APTA which will be the focus of follow-up drilling.
Conclusion: APTA has seen minimal exploration work in recent years as Orosur’s management focused on progressing the high-grade, open pit potential at Pepas. Following the MRE delivery, the Company is utilising a reassessed geological model to target additional mineralised zones at APTA. Today’s hole has revealed three targets for additional drilling, with shallow-lying mineralisation identified and improved scale and grade potential noted at depth. The Company is advancing several drilling programmes currently and we expect a steady stream of assays through the summer.