Marimaca Extends Pampa Medina Norte Discovery – Intersects 68m at 1.20% and 40m at 1.07% CuT in Dominantly Oxides with Assays Pending for Deep Sulphide Extension
News Release
Marimaca Extends Pampa Medina Norte Discovery – Intersects 68m at 1.20% and 40m
at 1.07% CuT in Dominantly Oxides with Assays Pending for Deep Sulphide Extension
Vancouver, British Columbia, May 1 5th, 2025 – Marimaca Copper Corp. (“Marimaca Copper” or the “Company”)
(TSX:MARI, ASX:MC2) is pleased to announce results of further drilling at Pampa Medina Norte, the recently discovered
northern extension of the Pampa Medina Deposit.
The latest result from hole SMD-01, follows news of the discovery hole - SMR-01 on December 30, 2024, which identified
this northern extension of the Pampa Medina deposit, located approximately 26km from the Company’s flagship Marimaca
Oxide Deposit (“MOD”).
Hole SMD -01 is the first diamond drill hole targeting validation and depth -extension of the reverse circulation ( “RC”)
drilling. SMD-01 was drilled to a final depth of 950m with assays pending from 600m to the bottom of the hole.
Highlights
• Hole SMR-01 and SMD-01 were drilled approximately 400m north of the known northern extent of the Pampa
Medina deposit (see Figure 3)
― SMD-01 was drilled to a final depth of 950m to investigate the potential for repeating manto-mineralized units
at depth in primary mineralization
• SMD-01 confirms the material extension of the sediment-hosted ‘manto-style’ mineralization
― Confirmation of high-grade, oxide manto in the upper part of the sedimentary horizon consistent with Pampa
Medina deposit and SMR-01
― New zone of manto-style sulphide mineralization identified at depth containing dominantly chalcopyrite-
bornite mineralization in deeper, interbedded sandstone and conglomerate units with variable intensity
― Assays pending for 600m-950m will be released to the market when received and validated
• Highlights from the upper section of SMD-01 are below:
― 242m at 0.65% CuT from 252m including:
68m at 1.20% CuT from 298m, including
o 20m at 2.25% CuT from 298m
o 32m at 1.03% CuT from 332m
74m at 0.84% CuT from 420m, including
o 40m at 1.07% CuT from 420m
• Results from the upper zone in SMD-01 validates the previous RC drilling in SMR-01
― Deviation of SMD-01 is approximately 25m north of SMR-01 in the upper oxide manto
• True widths cannot be determined at this time, however SMD-01 was orientated to target perpendicular
intersections of the key manto-hosting lithological units
• Two additional deep diamond drill holes remain pending at Pampa Medina exploring the potential for extension of
the system at depth (see Figures 2 and 3)
― SMD-02, drilled at Pampa Medina main 650m south of SMD-01, encountered visual copper mineralization in the
Pampa Medina upper manto, and polymetallic mineralization at depth, in a lower metasedimentary unit,
including galena and sphalerite
― Indicates the potential presence of other horizons prospective for mineralization and other mineralized bodies
not previously considered
― Results will be released to the market when received and validated – sample preparation is underway
Sergio Rivera, VP Exploration of Marimaca Copper, commented:
“The scale and intensity of mineralization at Pampa Medina Norte continues to impress us. We now think the system has
good potential for stacked mantos which, based on our review of historical drilling data, could be extensive across the
broader Sierra De Medina project area.
We are encouraged by the continuation of mineralization at depth, especially the visual bornite and chalcopyrite , These
findings also serve to further improve our understanding of the sulphide body which has the potential to be highly accretive
to the high-quality overlying oxide leachable manto, where our PEA for the integration into the MOD is progressing.
SMD-02, for which we are currently preparing samples to be assayed, presented a surprise intersection of polymetallic
mineralization, which we had not previously considered, but further supports our view that this system has significant
ongoing exploration potential.
We are looking forward to updating the market in the near -term on the results from the assays at depth, as well as our
additional deep drill holes at Pampa Medina main. Our view remains that we are still in the very early days of the Pampa
Medina story and the consolidation of the area has allowed, for the first time, the development of our overall thesis that
Pampa Medina and its surroundings represents a single, large scale mineralized system which could be highly
complementary to the MOD.”
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 underlaying by a Upper Paleozoic complex of
metasediments and intrusions. Copper is found predominantly in oxide species dominated by atacamite, chrysocolla and
both secondary and primary chalcocite. Primary sulphides encountered to date correspond to variable amounts of
chalcopyrite and bornite.
Hole SMD-01 was drilled approximately 400m north of the northern margin of the known deposit at Pampa Medina.
SMD01 was collared at Azimuth 270°, Dip -60° and drilled to a total depth of 950m. The collar was located 12m SE from
SMR-01 but further deviated, reaching approximately 70m at the 650m depth. High grade copper oxide mineralization
was intersected from 252m-494m downhole depth in an upper unit of sandstones and shales. Rhyolitic tuff, intruded by
late dykes was intersected below the upper sediments from 492m to 564m and below that another more clastic rich unit
extends up to the bottom of the hole. Metasediment basement was not reached at depth in hole SMD-01, meaning that
the productive sedimentary unit increase s in thickness towards the north. Mineralization transitioned to primary
chalcopyrite and bornite mineralization at 550m, with increasing intensity of bornite content at depth. The hole was
terminated at 950m.
SMD-01 confirms the s ediment-hosted oxide mineralization encountered in SMR-01, which is largely interpreted as the
extension of the sediment -hosted manto deposits of Pampa Medina main (see Figure 2) . Historical drilling at Pampa
Medina was generally limited to a depth of 400m, potentially too shallow to intersect the chalcopyrite-bornite dominant
manto mineralization found in SMR-01, confirmed and potentially extended at depth by SMD-01.
Figure 1: Regional Map – Marimaca and Sierra de Medina
25km
Figure 2 – Southern Sierra de Medina – Pampa Medina Deposit and Step-out Drilling Locations
Figure 3 – Long Section Looking West – Pampa Medina and Pampa Medina Norte
Figure 4 – Selected Core Photos from SMD-01 dominant mineralization types. Core size is HQ.
Table 1: Table of Intersections (Pampa Medina Norte)
Hole Easting Northing Elevation Azimuth Inclination Depth
SMD-01 4070781.42 7441265.92 1270.04 270 -60 950
Table 2: Drill Collar (Pampa Medina Norte)
Sampling and Assay Protocols
True widths cannot be determined with the information available at this time. DDH holes were sampled on a 2m
continuous basis, halved by a conventional core splitter on site with one half sent to the Andes Analytical Assay
preparation laboratory in Copiapó and the pulps then sent to the same company laboratory in Santiago for assaying.
Samples were prepared using the following standard protocol: drying; crushing all sample to -1/4” and passing
through a secondary crusher to better than 80% passing - 10#; hom ogenizing; splitting; pulverizing a 400 -600g
subsample to 95% passing -150#; and a 125g split of this sent for assaying. All samples were assayed for %CuT (total
copper); %CuS (acid soluble copper). A full QA/QC program, involving insertion of appropriate blanks, standards and
Hole Total
Depth (m)
From (m) To (m) Intersection
(m) % CuT
SMD-01
952
252 494 242 0.65
Including 298 366 68 1.20
Including 298 318 20 2.25
And 332 364 32 1.03
And 420 494 74 0.84
Including 420 460 40 1.07
Including 420 452 32 1.32
And 472 494 22 0.84
duplicates was employed with acceptable results. Pulps and sample rejects are stored by Marimaca Copper for future
reference
Qualified Person / Competent Person
The technical information in this news release, including the information that relates to geology, drilling and
mineralization was prepared under the supervision of, or has been reviewed by Sergio Rivera, Vice President of
Exploration, Marimaca Copper Corp, a geologist with more than 40 years of experience and a member of the Colegio
de Geólogos de Chile and of the Institute of Mining Engineers of Chile, and who is the Qualified Person for the
purposes of NI 43-101 responsible for the design and execution of the drilling program.
The information in this announcement which relates to exploration results for the Pampa Medina Project is based
on, and fairly reflects, information and supporting documentation prepared by Sergio Rivera, VP Exploration of
Marimaca, a Competent Person who is a member of the Comision Minera (Chilean Mining Commission), Colegio de
Geólogos de Chile and of the Institute of Mining Engineers of Chile . Mr. Rivera has sufficient experience that is
relevant to the style of mineralisation and types of deposit under consideration and to the activity being undertaken
to qualify as a Competent Person as defined in the 2012 Edition of the Joint Ore Reserves Committee Australasian
Code for Reporting of Exploration Results, Mineral Resources and Ore Reserves. Mr. Rivera consents to the inclusion
in this announcement of the matters based on his information in the form and context in which it appears.
Contact Information
For further information please visit www.marimaca.com or contact:
Tavistock
+44 (0) 207 920 3150
Emily Moss / Ruairi Millar
Forward Looking Statements
This news release includes certain “forward -looking statements” under (without limitation) applicable Canadian
securities legislation, including, without limitation, statements regarding the development of activities at Pampa
Medina, the potential growth of Pampa Medina, and the discovery’s potential to complement the MOD. There can
be no assurance that such statements will prove to be ac curate, and actual results and future events could differ
materially from those anticipated in such statements. Forward -looking statements reflect the beliefs, opinions and
projections on the date the statements are made and are based upon a number of assumptions and estimates that,
while considered reasonable by Marimaca Copper, are inherently subject to significant busines s, economic,
competitive, political and social uncertainties and contingencies. Many factors, both known and unknown, could
cause actual results, performance or achievements to be materially different from the results, performance or
achievements that are or may be expressed or implied by such forward -looking statements and the parties have
made assumptions and estimates based on or related to many of these factors. Such factors include, without