Pampa Medina Sulphide Drilling Intersects 16m of 5.70% Cu and 62.6 g/t Ag including 4m of 11.32% Cu and 144.0 g/t Ag in Significant Extension of UHG Bornite Zone
Pampa Medina Sulphide Drilling Intersects 16m of 5.70% Cu and 62.6 g/t Ag including
4m of 11.32% Cu and 144.0 g/t Ag in Significant Extension of UHG Bornite Zone
Vancouver, British Columbia, June 8, 2026 – Marimaca Copper Corp. (“Marimaca Copper” or the “Company”)
(TSX:MARI, ASX:MC2) is pleased to report additional assay results from its ongoing drilling program at the Pampa Medina
deposit, located at low altitude approximately 28km east of the Company's Marimaca Oxide Deposit ("MOD") (Figure 1) in
Antofagasta Region, Chile . Drilling completed on 150m centres continues to demonstrate continuity of ultra -high-grade
copper-silver mineralization across the central zone of the Pampa Medina deposit, with SPRD-05 intersecting 96m at 1.19%
Cu and 11.7g/t Ag, including 16m at 5.70% Cu and 62.6g/t Ag and 4m at 11.32% Cu and 144g.0/t Ag. The sediment-hosted
system is demonstrating strong lateral continuity across the initially defined 3km x 1.5km area of interest (“AOI”),
reinforcing the significant scale of the deposit.
▪ High-grade sulphide mantos show strong lateral continuity across the defined AOI, with 150m-spaced delineation
drillholes continuing to intersect high grades (>2% Cu) over significant widths in dominantly bornite and chalcocite
▪ SPRD-05 – drilled east of previously released hole SPRD-06 – intersected the ultra-high grade (UHG) bornite manto
at depth in sediments and tuffs
▪ 96m of 1.19% Cu and 11.7g/t Ag from 692m (sulphide), including
― 60m of 1.80% Cu and 18.4g/t Ag from 694m, including
▪ 16m of 5.70% Cu and 62.6g/t Ag from 704m, including
▪ 4m of 11.32% Cu and 144.0g/t Ag from 706m
― Details of lithology and grade across the broader intersection are shown in Figure 6
▪ Represents one of the strongest bornite-mineralized manto intersections to date at Pampa Medina
▪ Near surface oxide mineralization also intersected in volcanics and sediments north of the historic Pampa
oxide footprint
― 22m of 0.40% Cu and 1.9g/t Ag from 60m (oxide)
― 24m of 0.30% Cu and 1.8g/t Ag from 204m (oxide)
▪ SPRD-05 was drilled approximately 650m northwest of SMRD-13 which also intersected the UHG bornite zone
at depth (see announcement dated July 3rd, 2025)
▪ SPRD-04 – drilled 150m north of previously released SMRD-13 and ~600m east of SPRD-05 – intersected broad
mineralization across sediments and tuffs
▪ 22m of 1.97% Cu and 9.2g/t Ag from 610m (sulphide)
▪ Shallower intersection of 140m of 0.35% Cu from 366m including higher-grade stacked mantos
― 32m of 0.71% Cu and 4.1 g/t Ag from 468m (mixed), including
▪ 10m of 0.95% Cu and 7.4g/t Ag from 484m (mixed)
▪ The Company is also completing target-generation geochemical and geophysical programs across the broader Sierra
Medina land package, focusing on the Sierra Norte and Pampa Norte areas (see Figure 2)
▪ Focus of these programs is identifying continuations of the favourable, mineralized sedimentary units across
the broader interpreted sedimentary basin
▪ A 400m audio-magnetotelluric (AMT) grid has been completed across the Pampa Norte area, with a higher-
resolution 200m grid completed at Sierra Norte
▪ Results and interpretations will be released in due course
Sergio Rivera, VP Exploration of Marimaca Copper, commented:
“Results from the 2026 drilling program at Pampa Medina continue to demonstrate the incredible grade and thickness of
the mantos at Pampa Medina , which remains open in almost all directions . We are pleased to see that drilling on 150m
spacing continues to demonstrate continuity of the high-grade copper and silver mineralization, often across multiple
stacked horizons, with SPRD-05 intersecting one of the highest-grade mantos we have seen to date (Figure 5).
We have always said that continuity will be the maker of the Pampa Medina deposit, and our drilling completed to date
gives us confidence that we are dealing with a deposit of genuine district significance.”
“We are completing a 150m-spaced campaign across the defined initial AO I, after which we will cut off input data for an
initial Mineral Resource Estimate (MRE). This maiden MRE will represent a snapshot in time, as following completion of the
delineation campaign, we will begin the broader step -out program to the distal northern and western targets in parallel
with initial resource work. The consistency of high-grade intersections gives us increasing confidence that the central AOI
can support a strong mineral endowment while remaining open for expansion.”
Overview of Pampa Medina
Pampa Medina is a manto-style copper deposit dominantly hosted in Jurassic-Triassic sedimentary units (sandstones,
conglomerates, tuffs and black shales) overlain by andesitic volcanics and underlain by an Upper Paleozoic complex of
metamorphosed sediments, volcanics and intrusions. Key lithological units are intruded by a dyke swarm and affected by
post mineral normal faulting. Copper was originally identified in near-surface oxide mineralization dominated by
atacamite, chrysocolla and both secondary chalcocite , and has now been identified in high -grade zones of bornite ,
chalcopyrite, covellite and chalcocite which extend at depth beyond the oxide-primary transition. Elevated silver grades
are present in both oxide and sulphide copper-mineralized zones and are generally correlated with copper grade.
Following Marimaca’s consolidation of the project area and surrounding land packages in 2024, the Company
reinterpreted all available geological information and developed an updated geological model for Pampa Medina , which
identified the lower sedimentary units of interbedded sandstones, shales, tuffs and conglomerates as the priority target
horizons for future drilling. Marimaca’s 2026 drilling campaign will focus on three priority goals: definition of the high -
grade central AOI, delineating the identified oxide extensions, and further step-out drilling to test potential extensions of
the broader system identified in geophysical work completed to date.
Figure 1: Regional Map – Marimaca, Pampa Medina and Regional Infrastructure
25km
Figure 2: Pampa Medina within Broader 100%-owned Sierra de Medina Property Block
Figure 3. Current Drilling Results within Pampa Medina Area of Interest (AOI)
Figure 4. Current Drilling Results and Drilling to Date within Pampa Medina Area of Interest (AOI)
Figure 5 – Cross Section Looking North – Pampa Medina 7,440,950 N
Figure 6 – SPRD-05 Downhole Lithological and Grade Sequence