Vancouver, British Columbia, March 28, 2022 – Marimaca Copper Corp. (“Marimaca Copper” or the “Company”)
(TSX: MARI) is pleased to announce results from the first seven (7) reverse circulation (RC) drill holes, totaling 2,150m, from the 2022 infill drilling campaign at the Marimaca Oxide Deposit (“MOD”). The first drill holes were completed in the south-eastern area of the MOD in an area previously considered to be on the margin of the near-surface oxide copper mineralization.

The drilling intersected broad zones of near-surface green copper oxide mineralization in six out of seven holes.  Importantly, several zones appear to be extensional to the existing Mineral Resource Estimate (MRE) (released December 2019) for the MOD, and the interpretation of the new mineralized intersections indicates that the MOD remains open at depth and to the south-east, indicating potential upside with ongoing drilling in this area.

A video is available with Hayden Locke, President & CEO, discussing today’s results.

Highlights

• Expected mineralization encountered in six out of seven holes with grades often exceeding those modelled in MRE
• MAR-134 and MAR-132 extend mineralization into areas previously interpreted to be barren or lower-grade
• Expected to have positive implications for the updated MRE
• Notable intersections include:
• MAR-134 intercepted 106m of 0.53% CuT from 2m, including 28m of 1.05% CuT from 72m
• MAR-132 intercepted 54m of 0.62% CuT from 80m and a high-grade feeder structure of 20m at 1.62% CuT from 278m at the bottom of the hole, all within a broader intercept of 226m of 0.43% CuT from 72m
• MAR-135 intercepted 58m of 0.41% CuT from 2m
• MAR-131 intercepted 202m of 0.31% CuT from 42m, including 74m of 0.47% CuT from 162m
• MAR-133 intercepted 76m of 0.26% CuT from 156m
• MAR-129 intercepted 58m of 0.27% CuT from 68m
• MAR-130 intercepted lower grade copper mineralization corresponding to leached and fractured rocks along a known late fault zone
• Drilling continues to highlight the lateral continuity as well as the thickness of the MOD mineralized column as well as ongoing potential for extensions at depth
• The MOD remains open to the southeast towards the Sierra satellite target, located 400m southeast from the margin of the MOD (see Figure 5 and announcement dated January 20, 2022)

Sergio Rivera, VP Exploration of Marimaca Copper, commented:

“The first seven drill holes were aimed at infilling an area in the south-eastern corner of the MOD that was interpreted in previous as lower grade material and was considered to mark the limits of copper oxide mineralization. We were pleasantly surprised with the results, which show significant mineralization in nearly all of these holes.

“There are two important takeaways from today’s results: firstly, there remains potential resource upside at the MOD, demonstrated by the first holes from the infill program, where several intersections had grades well above those interpreted in the 2019 MRE. Secondly, the results provide confirmation that the MOD remains open to the south-east towards the Sierra Target and at depth. The Sierra Target was hypothesised as an extension of the MOD and these results support that conclusion, which provides an exciting opportunity for further resource growth.

”The infill program will now progress north towards the central part of the MOD targeting conversion of our existing Inferred Resources to Measured and Indicated categories.”

Overview of Drilling Campaign Objectives and Results

Marimaca’s 2022 drilling campaign consists of 22,500m of planned infill drilling of the MOD and an additional 10,000m of drilling of the MAMIX zone, the depth extension of the MOD (see press releases dated February 9, 2022 and January 20, 2022). Both programs will support an updated Mineral Resource Estimate (“MRE”) planned for early Q3 2022. The 2022 programs are aimed at converting the MOD’s existing Inferred Resource (see press release dated December 2, 2019) to Measured and Indicated categories, as well as resource growth through infill drilling of the MAMIX discovery made in 2021 (see press release dated October 14, 2021).