Adventus and Salazar Announce Drilling Results at the El Domo Deposit Highlighted by 26.8% Copper Equivalent Over 9.1 Metres

TORONTO, June 15, 2021 - Adventus Mining Corp. ("Adventus") (TSXV: ADZN) (OTCQX: ADVZF) and Salazar Resources Ltd. ("Salazar") (TSXV: SRL) (OTCQB: SRLZF) (collectively the "Partners") are pleased to announce its final infill drilling results from the El Domo volcanogenic massive sulphide deposit ("El Domo") located within the 21,537-hectare Curipamba project in central Ecuador. All results from the completed infill definition drilling program are being used to update the Mineral Resource estimate for El Domo, which will serve as the basis of the ongoing El Domo feasibility study with completion expected in the fourth quarter of 2021.

Highlights - Drill Results from the El Domo Deposit at Curipamba:

• CURI-385 intersected 9.06 metres of 3.25% copper, 19.08 g/t gold, 30.56% zinc, 242.5 g/t silver, and 3.19% lead for 26.78% CuEq - including 3.48 metres of 2.37% copper, 35.13 g/t gold, 39.51% zinc, 470.7 g/t silver, and 7.50% lead for 41.22% CuEq
• CURI-382 intersected 30.86 metres of 2.05% copper, 0.92 g/t gold, 0.16% zinc, 9.2 g/t silver, and 0.02% lead for 2.74% copper equivalent ("CuEq") - including 3.81 metres of 6.56% copper, 1.48 g/t gold, 0.07% zinc, 13.4 g/t silver, and 0.02% lead for 7.60% CuEq

Drill hole CURI-382 intersected a thick section of massive sulphide from 92.95 to 123.81 metres, grading 2.05% copper, 0.92 g/t gold, 0.16% zinc, 9.2 g/t silver, and 0.02% lead (2.74% CuEq). Two higher-grade subsets were intersected from 92.95 to 96.69 and 120.00 to 123.81 metres, respectively. The first interval graded 3.77% copper, 1.60 g/t gold, 0.47% zinc, 21.7 g/t silver, and 0.08% lead (5.08% CuEq) and the second interval graded 6.56% coper, 1.48 g/t gold, 0.07% zinc, 14.1 g/t silver, and 0.02% lead (7.60% CuEq).

CURI-384 intersected mineralized grainstone with massive sulphide clasts in the immediate hanging wall of the massive sulphide mineralization, grading 0.06% copper, 0.62 g/t gold, 0.56% zinc, 50.3 g/t silver and 0.24% lead (1.10% CuEq). A thin interval of massive sulphide mineralization was intersected from 86.93 to 87.54 metres, grading 1.46% copper, 25.90 g/t gold, 21.76% zinc, 686.0 g/t silver and 9.32% lead (31.76% CuEq). A section of mineralized footwall felsic autoclastic volcanic rocks was intersected from 87.54 to 95.60 metres, grading 0.13% copper, 0.28 g/t gold, 1.29% zinc, and 12.1 g/t silver and 0.12% lead (0.82% CuEq).

Drill hole CURI-385 intersected mineralized fine-grained sediments in the immediate hanging wall of the massive sulphide mineralization from 85.85 to 90.48 metres, grading 0.07% copper, 1.40 g/t gold, 0.75% zinc, 27.3 g/t silver, and 0.10% lead (1.41% CuEq). Massive sulphide mineralization was intersected from 90.48 to 99.54 metres, grading 3.25% copper, 19.08 g/t gold, 30.56% zinc, 242.5 g/t silver, and 3.19% lead (26.78% CuEq). A higher-grade subsection occurs from 90.48 to 93.96 metres, grading 2.37% copper, 35.13 g/t gold, 39.51% zinc, 470.7 g/t silver and 7.50% lead (41.22% CuEq). A section of mineralized footwall felsic autoclastic volcanic rocks was intersected from 99.54 to 106.47 metres, grading 0.13% copper, 0.40 g/t gold, 1.25% zinc, and 4.8 g/t silver and 0.02% lead (0.79% CuEq).

Drill holes CURI-386, CURI-387, and CURI-389 were designed were designed to test the outer margins of the Indicated category material and to further assess the pit wall geology. These drill holes confirmed modelling previously done along the margins of the deposit and provide excellent geological control for future modelling studies. Both CURI-386 and CURI-387 intersected low-grade sections of footwall mineralized felsic autoclastic volcanic rocks 73.06 to 82.49 and 80.60 to 85.40 metres, respectively. CURI-386 graded 0.13% copper, 0.78 g/t gold, 0.30% zinc, 17.3 g/t silver and 0.09% lead (0.86% CuEq) for an approximate true thickness of 6.13 metres and CURI-387 graded 0.02% copper, 0.30 g/t gold, 0.13% zinc, 10.4 g/t silver and 0.03% lead (0.34% CuEq) for an approximate true thickness of 4.56 metres. CURI-389 did not yield any significant results.

All results from the completed infill definition drilling program are being used to update the Mineral Resource estimate for El Domo, which will serve as the basis of the ongoing feasibility study for the development of El Domo (see December 2, 2020 news release). Figure 1 illustrates the drill locations for the results of the six drill holes outlined in this news release. Drill collar location coordinates are summarized for the infill and geomechanical drilling programs in Table 1 at the end of this news release.

For reference, the last Mineral Resource estimate completed in accordance with NI 43-101 for El Domo was published as part of the preliminary economic assessment report titled: "Technical Report on the Preliminary Economic Assessment for the Curipamba Project - El Domo Deposit, Central Ecuador", with an effective date of June 14, 2019 on SEDAR.

Technical Information and QAQC

The Curipamba project work program is being managed and reviewed by Vice President Exploration, Jason Dunning, M.Sc., P.Geo., a Qualified Person within the meaning of NI 43-101. Salazar staff collect and process samples that are securely sealed and shipped to Bureau Veritas ("BV") in Quito for sample preparation that includes crushing and milling to prepare pulps that are then split for shipment to their facility in Lima, Peru or Vancouver, Canada for analysis. All assay data have undergone internal validation of QAQC; noting there is an established sampling control program with blind insertion of assay blanks, certified industry standards and sample duplicates for the Curipamba project. A QAQC program is also in place at BV and includes insertion of blanks, standards, and duplicate reanalysis of selected samples. BV's quality system complies with the requirements for the International Standards ISO 9001:2000 and ISO 17025: 1999. At BV, samples from the El Domo infill drilling have gold analyzed by classic fire assay techniques with an AAS finish, while silver and base metals are analyzed by a 44-element aqua regia technique with ICP-AES finish. For regional drilling, silver and base metals are analyzed by a 45-element 4 acid technique with ICP-MS finish. Overlimit protocols are in place for gold, silver, copper, lead, and zinc.

Qualified Person

The technical information of this news release has been reviewed and verified as accurate by Mr. Jason Dunning, M.Sc., P.Geo., Vice President Exploration for Adventus, a non-Independent Qualified Person, as defined by NI 43-101.

About Adventus

Adventus Mining Corporation is an Ecuador focused copper-gold exploration and development company. Its strategic shareholders include Altius Minerals Corporation, Greenstone Resources LP, Wheaton Precious Metals Corp., and the Nobis Group of Ecuador. Adventus is advancing the El Domo copper-gold project through a feasibility study, while exploring the broader Curipamba district. In addition, Adventus is engaged in a country-wide exploration alliance with its partners in Ecuador, which has incorporated the Pijili and Santiago copper-gold porphyry projects to date. Adventus also controls an exploration project portfolio in Ireland with South32 Limited as funding partner as well as an investment portfolio of equities in several exploration companies. Adventus is based in Toronto, Canada, and is listed on the TSX Venture Exchange under the symbol ADZN and trades on the OTCQX under the symbol ADVZF.

About Salazar

Salazar Resources Ltd. is focused on creating value and positive change through discovery, exploration, and development in Ecuador. The team has an unrivalled understanding of the geology in-country and has played an integral role in the discovery of many of the major projects in Ecuador, including the two newest operating gold and copper mines. Salazar Resources has a wholly owned pipeline of copper-gold exploration projects across Ecuador with a strategy to make another commercial discovery and farm-out non-core assets. The Company actively engages with Ecuadorian communities and together with the Salazar family it co-founded The Salazar Foundation, an independent non-profit organization dedicated to sustainable progress through economic development. The Company already has carried interests in three projects. At its maiden discovery, Curipamba, Salazar Resources has a 25% stake fully carried through to production. At two copper-gold porphyry projects, Pijili and Santiago, the Company has a 20% stake fully carried through to a construction decision.

Neither the TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in the policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this news release.

This press release contains "forward -looking information" within the meaning of applicable Canadian securities laws. Any statements that express or involve discussions with respect to predictions, expectations, beliefs, plans, projections, objectives, assumptions or future events or performance (often, but not always, identified by words or phrases such as "believes", "anticipates", "expects", "is expected", "scheduled", "estimates", "pending", "intends", "plans", "forecasts", "targets", or "hopes", or variations of such words and phrases or statements that certain actions, events or results "may", "could", "would", "will", "should" "might", "will be taken", or "occur" and similar expressions) are not statements of historical fact and may be forward-looking statements.

Forward-looking information herein includes, but is not limited to, statements that address activities, events, or developments that Adventus and Salazar expect or anticipate will or may occur in the future. Although Adventus and Salazar have attempted to identify important factors that could cause actual actions, events, or results to differ materially from those described in forward-looking information, there may be other factors that cause actions, events or results not to be as anticipated, estimated, or intended. There can be no assurance that such information will prove to be accurate, and actual results and future events could differ materially from those anticipated in such information. Accordingly, readers should not place undue reliance on forward-looking information. Adventus and Salazar undertake to update any forward-looking information except in accordance with applicable securities laws.

Please also visit the Adventus website at www.adventusmining.com and LinkedIn page at https://www.linkedin.com/company/adventus-mining-corporation

Table 1: Drill Collar Information for Infill Drill Holes at El Domo

SOURCE Adventus Mining Corp.