Orosur Mining drilling Anzá Project, Colombia
Orosur Mining Inc. [TSXV: OMI] provided an update on the progress of exploration activities at the company’s exploration project at Anzá in Colombia.
The Anzá Project comprises a number of granted exploration titles and applications roughly 530km2, within the Mid-Cauca gold belt, west 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 of the project, the company has focused its attention on three prospects: Pepas – a shallow, high-grade deposit of gold mineralization for which the company has calculated a Mineral Resource Estimate (MRE), announced February 10, 2026.
APTA – a high-grade deposit of gold mineralization that has to date seen approximately 40,000 metres of drilling since 2012, with drilling ongoing. El Cedro – a cluster of gold/copper porphyry intrusions in the south of the Project area at which drilling has just commenced.
The El Cedro prospect lies to the south of the same integrated licence that hosts both Pepas and APTA and is roughly 4km south of the APTA base camp.
Work on the area began some years before Orosur’s tenure, when Anglo American undertook reconnaissance mapping and sampling, identifying a highly prospective gold/copper porphyry system. An extensive area of anomalous soil geochemistry was delineated, as well as channel samples and rock chip samples with assays up to 10g/t Au and 2% Cu.
Little work was then undertaken until late 2021, when the company’s previous JV partner MMA re-entered the area to carry out mapping, sampling and ground geophysics that largely confirmed Anglo American’s previous work and mapped several large dioritic intrusions and associated epithermal systems.
Post resumption of control of the project, the company undertook larger scale surface geochemical surveys during 2025 and early 2026, focusing on identifying structures and epithermal features proximal to the intrusions that could have the potential for higher grade metal accumulations.
Following an extensive period of permitting, socialization and logistical planning, the first drilling campaign ever undertaken at El Cedro, began in late August 2026, initially targeting the eastern flank of the northern intrusion and the bounding structures and veins.
Drilling has only just begun; however a porphyry intrusion was immediately intersected, demonstrating attractive stockwork veining, silicification and potassic alternation. This first hole, CED001, is planned to reach a depth of 500 metres which is expected to take roughly five weeks to complete.
Several new licence applications have recently been submitted, taking the total under application to 360km2. When combined with 170km2 of granted titles, the total Project area is now approximately 530km2.
Several of these new applications lie within forest reserve, or along the banks of the Cauca River and have been made for strategic reasons including to secure the Company’s position along the main access road.
Pepas West: 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 10, 2026.
Following completion of the MRE drill-out 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 mineralization might be developed and ounces added to inventory.
The company achieved immediate success with a new zone of shallow mineralisation being identified roughly 100 metres west of Pepas with first results announced on April 14, 2026.
Latest drilling at Pepas West (PEP106 and PEP107) have continued to define this zone with the picture now emerging of a surficial, heavily oxidized and possibly remobilized zone of medium grade mineralization.
Drill hole PEP106 returned 19.45 metres at 1.02 g/t gold, including 2.25 metres at 3.11 g/t gold, including 1.1 metres at 3.09 g/t gold. PEP107 returned 7.6 metres at 0.47 g/t gold. MAP108 returned 78.95 metres at 0.38 g/t gold.
The company is of the view that Pepas West is worthy of follow up, however the geometry of the zone (surficial, thin and broad) would likely require a large number of shallow holes, a situation that is not well suited to traditional diamond drilling as too much time would be lost in rig moves.
As a result, the diamond rig that has been at Pepas since late 2024, has been relocated to other prospects in the immediate vicinity while geological teams trial the application of an auger system to rapidly take samples of unconsolidated material down to a depth of roughly 10m.
A trial sampling program has been designed, the results of which, when completed, will be assessed to determine if this methodology has the potential to move Pepas to Resource status.
In addition, subject to results, the auger system may then be employed on a wider scale around Pepas to explore for similar shallow mineralization that may perhaps be hidden beneath a thin veneer of barren transported cover.
The APTA prospect in the centre of the project area has over 40,000 metres of drilling by various companies since 2012. This work has identified a substantial epithermal gold system.
The current drill plan at APTA is designed to better understand the geological controls upon the previously defined high-grade mineralization that may then assist in planning a future resource drill out program if results warrant.
The latest hole, MAP108, was drilled off section from the previous hole and intersected a broad interval of low-grade mineralisation and has provided valuable insight into the delineating structures that control higher grades.
Drilling is currently focused on understanding the shallower reaches of the APTA deposit which have thus far seen little further exploration.
Brad George, Orosur CEO, commented: “The Anza project is now ramping up with three rigs running, one at each of Pepas, APTA and El Cedro and planned to remain for some time. More prospects are also being advanced to the drill stage, demonstrating the extraordinary potential of this licence holding.”
Gold intersections are reported using a lower cut-off of 0.3 g/t Au over 3 metres. Intersections are quoted as downhole thicknesses. True thicknesses are unknown.
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