Orosur Mining's Exploration Expansion Delivers Strong Gold Assays From Colombian Assets

Project Overview and Strategic Positioning

Orosur Mining Inc. (TSXV: OMI; AIM: OMI) continues to accelerate its exploration efforts across its property portfolio, with three key gold projects now entering critical phases of development. The company has consolidated complete ownership of its Colombian Anzá Project (comprising approximately 330km² of exploration titles within the Mid-Cauca gold belt near Medellin) and maintains a 51% stake in the El Pantano Project in Argentina’s Santa Cruz province (550km² in the prolific Deseado Massif). This strategic positioning allows Orosur to pursue a focused exploration model built on geological merit and near-term production potential.

Pepas Prospect Delivers Exceptional Results

The Pepas gold deposit represents Orosur’s near-term resource development priority. Recent drilling has generated standout intercepts from three holes targeting both infill drilling and metallurgical assessment:

• PEP065 intersected 33.3m averaging 2.84g/t gold, with a high-grade sub-interval of 13.05m grading 5.87g/t Au
• PEP065B (directional redrill from the same collar due to ground instability) returned 33.8m @ 2.79g/t Au, including 11.45m @ 5.45g/t Au
• PEP066 (specifically designed metallurgical hole) produced the most impressive result: 112m from surface grading 5.25g/t Au, including multiple zones of 8.92g/t to 22.95g/t

These results validate the geometry and grade continuity of the Pepas ore body, which maintains shallow, high-grade characteristics across the tested intervals. The metallurgical hole’s comprehensive 112-meter intersection captures representative material from all identified mineral domains, essential for processing test work.

Resource Estimation and Technical Assessment Underway

Independent resource consultants are scheduled to mobilize on-site in early November to initiate the formal mineral resource estimate (MRE) process for Pepas. The company targets completion of a NI 43-101 compliant technical report by year-end 2025. This external validation represents the critical step in moving Pepas from exploration prospect to defined mineral resource, positioning it as a foundation asset for the broader Anzá Project.

El Cedro: Large-Scale Porphyry System Emerges

South of Pepas and the APTA deposit, the El Cedro prospect has undergone significant re-evaluation following extensive soil geochemistry work completed through 2025. Samples collected at ~25m intervals across ridge lines and elevated terrain have identified a substantial gold-bearing system with anomalous geochemical responses spanning a well-defined zoned porphyry system. Notably, certain soil samples have assayed above 1.0g/t Au.

Geological interpretation of these new geochemical datasets, combined with historical mapping information and legacy airborne geophysical surveys, has led to a revised model: El Cedro may comprise multiple intrusive bodies rather than a single porphyry center. A second porphyry system has been identified in the southern portion of the property within the same regional structural corridor. Associated epithermal vein systems at the margins of both intrusions show high-grade gold in rock chip sampling from previous reconnaissance work.

The company will undertake additional mapping and soil programs focused on the newly identified southern porphyry system. A detailed helicopter-borne magnetic and radiometric survey is planned for late 2024 or early 2025 to refine lithostructural interpretation across these porphyry bodies and associated epithermal zones. Drilling at El Cedro is anticipated to commence in Q1 2026.

Argentina Operations Advance to Active Drilling

The El Pantano Project represents early-stage, district-scale potential in an under-explored region. Since 2022, systematic geological mapping, geochemical sampling, and geophysical surveys across the 550km² license package have confirmed the presence of a 25km-long low-sulphidation epithermal structure—a framework that remained virtually untouched prior to Orosur’s involvement.

A reconnaissance-style drilling program totaling 3000 meters is now commencing at El Pantano, with the diamond drill rig having arrived on-site this week. The program will run through late January 2026 (accommodating the Christmas break) and target multiple sections along the identified epithermal trend. While surface geological indicators remain encouraging, vertical zonation data—only obtainable through drilling—are essential to refine the exploration model and identify areas of economic interest.

Strategic Momentum and Market Conditions

Brad George, CEO of Orosur Mining, commented: “Following our recent capital raise, Orosur is positioned to execute on a disciplined exploration strategy grounded in geological selection, asset ownership, and near-term development focus. The buoyant gold market backdrop provides an ideal environment for advancing these projects.”

The timing aligns with sustained market interest in gold exploration and development. Orosur’s combination of three-stage assets—from resource-ready (Pepas), to development-stage (APTA and El Cedro), to greenfields potential (El Pantano)—provides multiple value inflection points as work progresses through 2026.

Looking Ahead

The convergence of strong drill results, resource consultant mobilization, and active field campaigns across three projects indicates an acceleration phase for Orosur. The delivery of an updated NI 43-101 technical report for Anzá, coupled with the commencement of systematic drilling at El Pantano, should provide material catalysts for investor attention in the coming quarters.