Announcement • Jun 09
Marimaca Copper Reports Additional Assay Results from Ongoing Drilling Program At Pampa Medina Deposit Marimaca Copper Corp. reported additional assay results from its ongoing drilling program at the Pampa Medina deposit, located at low altitude approximately 28km east of the Marimaca Oxide Deposit 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, 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 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. 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. 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. 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. 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. True widths are estimated as 80% of reported intervals, based on down-hole bedding and structural measurements. 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#; homogenizing; splitting; pulverizing a 400-600g subsample to 95% passing -150#; and a 125g split of this sent for assaying. Announcement • May 27
Marimaca Copper Corp., Annual General Meeting, Jun 30, 2026 Marimaca Copper Corp., Annual General Meeting, Jun 30, 2026. Recent Insider Transactions Derivative • Apr 29
Independent Director exercised options to buy CA$894k worth of stock. On the 27th of April, Timothy Petterson exercised options to buy 112k shares at a strike price of around CA$5.00, costing a total of CA$561k. This transaction amounted to 544% of their direct individual holding at the time of the trade. Since June 2025, Timothy's direct individual holding has decreased from 73.00k shares to 20.60k. Company insiders have collectively sold CA$2.9m more than they bought, via options and on-market transactions in the last 12 months. 
