Orosur Mining, a South America-focused mineral exploration company, has reported major advances in its drilling work at the Anzá gold exploration project in Colombia and the El Pantano gold/silver exploration project in Argentina.
At Anzá the company is advancing towards a NI43-101-compliant mineral resource estimate (MRE) for the Pepas prospect, with completion targeted for January 2026.
Meanwhile, at El Pantano, the company has confirmed the presence of a low-sulfidation epithermal mineral system, and drilling results indicate strong potential for continued exploration and development.
At the Anzá project, Orosur holds full ownership of approximately 330km² of exploration titles in the Mid-Cauca gold belt, following the acquisition of Minera Monte Aguila in November 2024 from previous joint venture (JV) partners Newmont Mining and Agnico Eagle Mines.
The company has focused its exploration on three main targets – Pepas, APTA and El Cedro.
Pepas is a shallow, high-grade gold zone that Orosur plans to advance to an initial MRE, and infill drilling at Pepas was commenced in July 2025.
In early November 2025, Orosur’s external geological and resource consultants visited the Anzá site to perform quality assurance and quality control verification and support the development of a new NI43-101 technical report.
Following the consultants’ recommendations to better define the deposit limits, the final stages of the Pepas MRE drill-out programme were extended to include several additional holes, both within and beyond the current deposit envelope.
Drilling outside the deposit envelope returned expected lower-grade halo mineralisation, providing valuable structural information.
Notably, hole PEP-067, drilled within the envelope, reported 83.7m at 4.29 grams per tonne (g/t) gold from surface.
At the El Pantano Project in Santa Cruz province, Argentina, Orosur holds 51% ownership under a JV agreement with Deseado Dorado.
The project spans roughly 550km² within the Deseado Massif, close to Anglo Gold’s Cerro Vanguardia and Newmont Mining’s Cerro Negro mines.
Orosur is currently in phase two of the JV and may earn up to 100% ownership by investing $2m (C$2.75m) in exploration by February 2027.
So far, seven holes have been drilled at El Pantano, with samples from the first five submitted for fire assay gold analysis, followed by multi-element analysis.
The drilling is progressing ahead of schedule and is expected to finish by the end of January 2026.
Orosur CEO Brad George said: “Pepas is now in the final mile of its MRE process and the pieces are coming together for a January report. In the meantime, we are lining up targets for when the rig is freed up later in December.
“Drilling at El Pantano, as with any undrilled project, was high risk, but we have hit what we hoped to hit – a previously unknown mineral system. Now we need to focus in, and given the scale of the system, that is a challenge… but a good challenge.”
