Orosur Mining Inc - drilling and sampling expands Pepas
Orosur Mining Inc - drilling and sampling expands Pepas
• Assays from five more holes at Pepas. Best results include:
• PEP028 - 31.35m @ 1.61 g/t Au
• PEP032 - 92m @ 1.68 g/t Au from surface
including 11.85m @ 6.84 g/t Au and 7.7m @ 5.05 g/t Au
• Channel sampling at North Pepas expands high grade anomalous zone, best
surface sample of 27.23 g/t Au.
• Access to North Pepas complete - drilling to commence soon.
• Soil sampling at El Cedro underway
London, April 23 rd, 2025 . Orosur Mining Inc. ("Orosur" or the
"Company") (TSXV/AIM:OMI), is pleased to announce an update on the progress of
exploration activities at the Company's flagship Anzá Project ("The Project") in Colombia.
Colombia - ANZÁ Project
The Anzá Project is now 100% owned by the Company following completion of a Share
Purchase Agreement ("SPA"), announced 28 th November 2024, 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 Project sits within the prolific mid-Cauca belt, Colombia's primary gold belt, and is located
along strike between several world class gold/copper deposits including Buritica, Quebradona
and Guayabales/Marmato (Figure 1).
From September 2018 to November 2024, the Anzá Project was under the control of its
previous JV partner MMA, itself a 50/50 venture between the world's two largest gold miners,
Agnico Eagle Mines and Newmont Mining.
Figure 1. Mid-Cauca Belt
Prospects
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.
Post the MMA acquisition in late November 2024, the Company more than doubled its land
holding in the mid-Cauca belt to 400km2, by virtue of gaining ownership of a large number of
licence applications held by MMA. This makes the Company one of the major land holders in
one of the world's most exciting gold belts.
These applications have yet to be properly assessed by the Company as most financial and
management resources have thus far been directed to drilling at Pepas.
Figure 2. Main prospects, licences pre-MMA acquisition
Pepas Prospect
Pepas was discovered by MMA in late 2021 by BLEG sampling and geological mapping,
followed by 11 diamond drill holes in 2022 (PEP001 to PEP011).
After completion of the transaction to buy MMA, the Company restarted drilling at the Pepas
prospect in late-November 2024.
Drilling commenced with hole PEP012, which was positioned to confirm previous high-grade
results in holes PEP001, PEP005 and PEP007 drilled in 2022.
Most drilling conducted to date by the Company has focussed on a central, high -grade core
around the first discovery holes. This has been an intentional strategy based on several
rationale:
· To understand the mineralisation and its litho-structural controls.
· To allow time for surface mapping and sampling to expand the anomalous zone and
provide targets.
· To allow time for permits and physical access to be developed to other parts of the
prospect.
· To examine the potential of moving a small part of Pepas to resource status which could
be beneficial in the context of the Colombian permitting system and a pre -existing
environmental exploitation permit over part of these licences.
Figure 3. Plan of holes
PEP028 was drilled at the northern extend of the central core, as a scissor hole to PEP015,
(Figure 4) to define the position of the Tesorito South fault and thickness of transported cover
in this location. This was necessary to assist in moving toward a r esource if future results
warrant. This hole confirmed previous drilling and recorded a thick sequence of medium grade
mineralisation.
Figure 4. Section, PEP028 and PEP015
Holes PEP029 and PEP030 were drilled from the same pad, some distance from the central
core and likely NW of the primary geological trend, testing a different geological horizon and
several mildly anomalous outcrops. Both intersected thick sequences of low er grade
mineralisation. Both of these holes and other work, suggest the potential for a large, reasonably
consistent low-grade halo of roughly 0.3g/t Au around a higher-grade core.
Hole PEP031B was the redrill of PEP031 which became stuck in broken ground. This hole
was drilled in the SE of the prospect, slightly off trend to test the downdip extension of a large
moderate-grade silicified outcrop that was interpreted to be a later phase of mineralisation from
the two phases that are thought to create the very high-grade mineralisation of earlier holes.
Hole PEP032 was drilled in the southern section of the prospect, at different angle to previous
drilling. The hole was planned as infill for resource modelling purposes and returned a very
thick intersection of moderate grade mineralisation from surface.
Drill intersections for these most recent five holes are as follows:
Hole Number From (m) To (m) Interval (m) Au (g/t)
PEP028 29.5 60.85 31.35 1.61
including 31.45 39.3 7.85 2.12
including 55.75 60.85 5.1 3.21
PEP029 0 30.7 30.7 0.31
34.6 42.5 7.9 0.42
PEP030 0 77.9 77.9 0.31
115.6 122.8 7 0.31
PEP031B 28.15 41.1 12.95 0.73
74.1 794.9 20.8 0.30
PEP032 0 92 92 1.69
including 0 66.7 66.7 2.26
including 2 13.85 11.85 6.84
Including 32.1 39.8 7.7 5.05
Table 1. Latest drill Intercepts, Pepas
North Pepas
Surface ridge and spur soil sampling undertaken previously by MMA, had identified a large,
highly anomalous region to the north of the current Pepas mineralisation. The Company has
been following up this work with more targeted and diagnostic channel sampling along tracks
or other exposures, looking to sample and assay in-situ saprolite or fresh rock (where present).
Such exposures are rare in the Pepas area due to soil cover and can be difficult to locate through
thick vegetation.
Results from one large channel sample undertaken by the Company, some 200m north of the
current extent of drilling were announced on 4th February 2025, returning 105m @ 1.15 g/t Au,
with some individual samples exceeding 5 g/t Au.
Figure 5, Pepas soil and Channel samples
Ongoing mapping by field crews has identified another smaller exposure some 20m to the east,
down slope in thick scrub. Channel sampling of this exposure has returned an average sample
interval of 49m @ 2.59 g/t Au, including a 10m section of 6.93 g/t Au, with a number of
samples exceeding 10g/t Au, and the highest 1m sample being 27.23 g/t Au (Figure 6).
Figure 6. North Pepas Channel Sampling
Crews continue to search for more such exposures, with current focus to the west and north.
North Pepas lies across a property boundary from the current drilling at Pepas, requiring both
negotiation of land access with the property owner and then development of physical access to
the area for drilling machinery. These have now been completed, an d it is thus expected that
drilling can commence at North Pepas in the next few weeks.
A drone based airborne magnetic survey was recently completed over the Pepas prospect.
Preliminary data have been received but final data should be available this week. These data
should be of assistance in understanding controls upon mineralisation at Pepas, and thus future
drill targeting across the prospect. It is likely however that the first hole at North Pepas will be
targeted to test depth extensions of the channel samples set out above.
El Cedro
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 ago before Orosur's tenure, when Anglo American
undertook reconnaissance mapping and sampling, identifying a highly prospective gold/copper
porphyry system.