Exploration Activities On The Anza Gold Project

LONDON, UK – Orosur Mining Inc. reported on exploration activities at the Anzá Gold Project in Colombia, and its El Pantano Gold/Silver Project in Argentina. The Company took the formal decision to commence infill drilling at its Pepas gold prospect at Anzá with the objective of moving Pepas to a NI43-101 compliant Mineral Resource Estimate (MRE) by the end of the year. The first several holes of this program vindicated this decision by returning exceptional widths and grades, especially hole PEP045 which returned 62.3m @ 12.76g/t Au.
The drill program has been designed in conjunction with external consultants to facilitate a MRE being calculated, with the multiple objectives of infilling previous drilling, expanding beyond current drilling to define the boundaries, and understanding the geological controls upon mineralisation and the variations in geology and grade across the deposit. Holes will be drilled in an order that attempts to address these issues concurrently.
These four holes announced are a continuation of this program and designed largely to infill to the required spacing to allow a MRE to be calculated to a high level of confidence. Drilling continues to return thick sequences of high-grade gold mineralisation, starting from surface or near surface.
Importantly, drilling is also providing guidance as to grade and mineralogical variation across the ore body that will allow our teams to define various metallurgical domains that will in turn form the basis of more advanced metallurgical studies that are planned to commence soon.
The El Cedro prospect is a large gold porphyry system, located toward the south of the Anzá project, on the same granted exploration licence as the Pepas and APTA deposits. The Company has recommenced a large ridge and spur soil sampling program that had been previously suspended due to seasonal rain and access issues. This program is now roughly 45% complete, and it is expected that the remainder of the program should be completed by mid-October 2025. The first batch of 40 samples from the restarted program have been submitted for assay this week, with results expected soon.
The El Pantano Project is an early-stage gold/silver exploration project in Santa Cruz province, southern Argentina. The Project comprises approximately 550km2 of contiguous licences in the prolific Deseado Massif region, roughly 45km from Anglo Gold’s Cerro Vanguardia mining camp.
The El Pantano Project is subject to an Exploration & Joint Venture (JV) agreement (with private Argentinean company DESEADO DORADO S.A.S and its shareholders (Deseado).
The Company has been carrying out regional exploration at El Pantano for several years, including geological mapping, geochemical sampling, ground magnetics and induced polarisation geophysical surveys. These work programs have provided evidence suggestive of major rift-related low sulphidation epithermal system, of the type that has led to the development of major gold and silver deposits in the region.
Drill permits for El Pantano were obtained late in 2024, and the Company is now finalising drill contracts with a view to commencing drilling in mid-October 2025, the first drill program that has ever been undertaken anywhere on the property. Between 10 and 14 diamond holes are planned for a total of approximately 3000m, targeting geological structures and geochemical/geophysical anomalies identified from previous work. Additional details will be provided once more precise timing is finalised.
The area is very remote and largely unpopulated and thus substantial effort has been required to plan and develop the necessary camp and access infrastructure for a drilling program of this size.
The Deseado Massif is a major gold producing area in Argentina and thus some necessary downstream infrastructure exists in the region. In particular, an international laboratory company has a fire assay facility in the regional town of Perito Moreno and thus a short assay turnaround time (for gold and silver) is anticipated.
CEO, Brad George, said, “Pepas remains on track and the high bar set by the early holes continues to be cleared on a regular basis. In the meantime, we are excited to be getting close to opening a second drilling front on our El Pantano project in Argentina. Early stage, but this is elephant country, and we like what we have seen thus far.”
The Anzá Project is now 100% owned by the Company following completion of a Share Purchase Agreement (SPA), whereby the Company purchased all of the shares of its previous JV partner; Minera Monte Aguila (MMA).
The Project, which is located 50km west of Medellin, is easily accessible and boasts excellent infrastructure including water, power and communications as well as a large exploration camp.
The Company is currently focussed on three prospects within the Anzá Project – Pepas, APTA and El Cedro. All three prospects are within the same granted exploration title that is broken into two, non-contiguous pieces (Figure 2).
Drilling is currently being undertaken at the Pepas prospect in the northern extent of the Anzá Project (pre-acquisition) over 10km north of the central base camp at APTA. In parallel, mapping and sampling is being undertaken over the El Cedro porphyry system in the south of the project area.