Announcement • Jul 08
Orosur Mining Inc Provides Update on Exploration Activities At Anzá Project in Colombia
Orosur Mining Inc. announced an update on the progress of exploration activities at the Company's exploration project at Anzá in Colombia. The Anzá Project in Colombia comprises a number of granted exploration titles and applications totalling roughly 330km2, within the Mid-Cauca gold belt, west of the city of Medellín. These titles and applications are owned 100% by two Colombian companies, Minera Anzá, and Minera Monte Aguila, both wholly owned subsidiaries of the Company. Since acquiring 100% control, the Company has focussed its attention on three prospects: Pepas - a shallow, high-grade ore body of gold mineralisation for which the Company has calculated a Mineral Resource Estimate ("MRE"), announced on February 10th 2026. APTA - a high-grade body of gold mineralisation that has to date seen over 39,000m of drilling, with drilling ongoing. El Cedro - a cluster of gold porphyry intrusions in the south of the Project area. Extensive mapping and sampling programs have been undertaken and planning for the first drill program undertaken at the prospect is well advanced. The Company's primary focus since reassuming control of the Project in late 2024, was to explore the immediate area of Pepas, ultimately leading to the publication of a maiden MRE for the Pepas gold deposit on February 10th, 2026. Following completion of the MRE drillout in late 2025, the Company then embarked on a semi-regional drilling program around the Pepas deposit. The objective of this drilling program was to better understand the larger scale litho-structural controls that led to formation of the Pepas deposit, such that, in combination with additional mapping and sampling in the wider region, vectors toward additional mineralisation might be developed. Two distinct prospect areas are included in these results. Four holes (PEP091 to PEP094) were drilled several hundred metres to the south of the Pepas deposit, to test a large area of silicification. However, no significant gold mineralisation was intersected. As announced on April 14th, 2026, a new zone of mineralisation, geologically similar to Pepas, has been discovered approximately 100m west of the main Pepas zone. The additional five holes (PEP095 to PEP099) were drilled around and beyond the northern extent of Pepas West in order to better understand controls upon this mineralisation and its possible breadth and strike extent. The results of these five holes are mixed, with gold grades generally lower than Pepas, perhaps suggestive of the host rock not being as attractive for mineralising fluids, due to being less silicified. The zone is also narrower than Pepas, with a different structural setting, and its relationship to Pepas is yet to be determined. Hole Number From (m) To (m) Interval (m) Au (g/t) PEP091 No significant intersections PEP092 No significant intersections PEP093 No significant intersections PEP094 No significant intersections PEP095 32.2 34.5 2.3 0.43 46.55 58.05 11.5 0.42 including 48.65 50.5 1.85 0.98 PEP096 No significant intersections PEP097 36 62.75 26.75 0.61 including 53.5 61.5 1.05 PEP098 23 40.1 17.1 1.27 including 30.45 33.1 2.65 3.14 PEP099 23.65 27.6 3.95 1.94 including 24.8 26.85 2.05 3.46 Table 1. Latest drill Intercepts, Pepas Prospect. More drilling will be required to understand the controls of Pepas West, before the zone can be infilled to determine scale and tonnage. However, recent high grade surface samples have opened the potential for a substantial increase in strike length. Whilst drilling at Pepas is ongoing, mapping and sampling in the wider region continues and is regularly producing more attractive prospects and potential drill targets. The Pepas region does present challenges with rugged terrain, and extensive soil and vegetation offering little outcrop. As a result, mapping and sampling coverage expands gradually as access tracks open areas for sampling. As noted in the NI43-101 report (as announced on 26 March 2026 and dated 16 January 2026) for the Anzá project, all of the indicated resource for the Pepas Orebody is contained within two bounding faults. However, several smaller surficial volumes of "inferred" material sit outside these faults, including one to the Southwest that had only been intersected by three historical holes, PEP025 (10.1m @ 1.46g/t Au from surface), PEP035 (11.4m @ 2.71g/t Au from surface) and PEP040 (10.25m @ 1.35g/t Au from surface). This area was not followed up on due to a focus on the main Pepas zone at the time, difficult access and safety issues related to a major power line that crossed this zone. However, as access tracks have opened for drilling, a small area of outcrop was uncovered to the Southwest of this mineralised zone, which when sampled returned high grade gold assays, with the highest being 79.6g/t Au. This small outcrop sits directly along strike from the currently understood and trend of Pepas West, and if related, could substantially increase strike length of mineralisation to close to 200m. Issues related to access of the power line have been resolved, and the drill rig has just begun drilling a hole to test beneath these high-grade samples. Coordinates WGS84, UTM Zone 18. Orosur Mining Inc. staff follow standard operating and quality assurance procedures to ensure that sampling techniques and sample results meet international reporting standards. Drill core is split in half over widths that vary between 0.3m and 2m, depending upon the geological domain. One half is kept on site in the Minera Anzá core storage facility in the case of the Anza Project, or on site in temporary racks in the case of the El Pantano Project, with the other sent for assay. Industry standard QAQC protocols are put in place with approximately 10% of total submitted samples being blanks, repeats or Certified Reference Materials (CRMs). Samples for holes PEP-001 to PEP-011 were sent to the Medellin preparation facility of ALS Colombia Ltd, and then to the ISO 9001 certified ALS Chemex laboratory in Lima, Peru. Samples from PEP-012 onwards are sent to Medellin laboratory of Actlabs for preparation and fire assay, with some sample then sent to the Canadian Actlabs facility for multi element assay. Samples from the EL Pantano project are sent to the preparation facility and fire assay laboratory of Alex Stewart Laboratories in Perito Moreno to be assayed for gold. Pulps are then sent to the larger Alex Stewart facility in Mendoza for multi-element analysis. 30 gram nominal weight samples are then subject to fire assay and AAS analysis for gold with gravimetric re-finish for overlimit assays of >5 g/t. ICP-MS Ultra-Trace level multi-element four-acid digest analyses may also undertaken for such elements as silver, copper, lead and zinc, etc. Gold intersections are reported using a lower cut-off of 0.3g/t Au over 3m. Intersections are quoted as downhole thicknesses. True thicknesses are unknown.
