Mr. Rob L'Heureux reports

METALERO DISCUSSES THE GEOLOGICAL SIMILARITIES BETWEEN THE SAN CRISTOBAL EAST AND SAN CRISTOBAL SOUTH PROJECTS WITH THE KNOWN MINERALIZATION OF THE SAN CRISTOBAL REGION

Metalero Mining Corp. has provided further geological context for its recently announced project acquisitions in Bolivia near the San Cristobal silver-lead-zinc mine. As announced on May 20, 2026, Metalero has applied for 230 square kilometres (or 23,000 hectares) of exploration concessions known as the San Cristobal East and San Cristobal South projects in western Bolivia.

"Our newly staked claims, next to two of the most prominent, and promising, silver assets in the world, are well aligned with Metalero's vision as an early mover in Bolivia," stated Rob L'Heureux, president and chief executive officer of Metalero Mining. "The similarities between our SCE and SCS projects and the San Cristobal mine is staggering as we look at the regional geology including multiple phases of mineralized magmatic activity, numerous faults and structures, and known mineral occurrences of precious and base metals. We are excited to be at the ground floor of this fantastic, unexplored opportunity."

The SCE and SCS projects share important common geological aspects with the San Cristobal mine and the Isidorito prospect including*:

• Proximity to the Uyuni fault system;
• A structural geology framework with intersections acting as magmatic and hydrothermal fluid pathways;
• Permeable host rocks allowing for the infiltration of mineralizing fluids;
• Similar geology in the surrounding area hosts small- and large-scale mines and occurrences; and
• Mapped intrusive and volcanic rocks with ages bracketed by the SCM and Isidorito host rocks.

* The information concerning adjacent properties and mineralization is provided solely for informational purposes and should not be construed as a guarantee of mineral presence, quality or economic viability. While efforts have been made to provide accurate and up-to-date information, mineralization can vary significantly between properties and may not be indicative of similar conditions on Metalero's properties. Neither Metalero nor the qualified person has visited these adjacent properties and has not verified the information presented.

Geological merits of the SCE and SCS projects

The SCE project lies approximately five kilometres east of the San Cristobal mine and covers approximately 140 square kilometres (or 14,000 hectares). The project contains multiple series and ages of geological structures and structural intersections, including the UFS and younger east-northeast-trending faults which extend outward from the main 7.6-million-year volcanic unit of the San Cristobal mine. Fracture networks, such as these, are critical in epithermal systems for the transportation of mineralizing fluids. The permeable tuffs and conglomerates at the SCE project, coupled with the existing fracture network, could allow for the infiltration of mineralizing fluids and the subsequent precipitation of metals.

The SCS project is about 40 kilometres southwest of the San Cristobal mine, six km east of the Isodorito project, and covers approximately 90 square kilometres (or 9,000 hectares). The geology along the eastern boundary consists of the same sedimentary rocks which host the San Cristobal mine lavas and numerous additional gold-silver and copper occurrences and mines in the region. These sedimentary rocks are intruded by 6.27-million-year porphyritic andesites, a phase of magmatic activity that falls between the 7.6-million-year San Cristobal Lavas and the 2.6-million-year Negra lavas that are the target of the Isidorito project to the west.

San Cristobal mining -- production and exploration highlights*:

• Producing silver, lead and zinc since August, 2007;
• Currently producing approximately 38 million silver equivalent ounces per year with all-in production costs of approximately $17 (U.S.) per ounce (silver equivalent) (Quinton Hennigh, Swiss Resource Capital AG interview, Nov. 18, 2025);
• Aggressive exploration with up to 14 drill rigs over the past two years has yielded 12 to 13 years of additional sulphide mineralization with the potential to expand out 25 years to 2050 (Mr. Hennigh -- Metals Investor Forum, Jan. 28, 2026);
• Potential future development of stockpiled oxide material containing approximately 200 million ounces of silver for an additional 12- to 13-year mine life (Mr. Hennigh -- Metals Investor Forum, Jan. 28, 2026);
• Exploration with 10 drill rigs at the Isidorito prospect 40 kilometres south of the San Cristobal mine (Mr. Hennigh -- PDAC presentation -- March 3, 2026).

* The information concerning adjacent properties and mineralization is provided solely for informational purposes, and should not be construed as a guarantee of mineral presence, quality or economic viability. While efforts have been made to provide accurate and up-to-date information, mineralization can vary significantly between properties and may not be indicative of similar conditions on Metalero's properties. Neither Metalero nor the qualified person has visited these adjacent properties and has not verified the information presented.

San Cristobal regional background

The San Cristobal region lies in the Potosi department of southwestern Bolivia along the borders with Chile and Argentina. This area is dominated by the Andes mountain range and the Altiplano basin. The Andes formed through long-term plate subduction along the west coast of South America with consequent intense folding, faulting and magmatic activity. This tectonic activity led to the formation of prolific silver, lead, zinc and tin deposits in this region of Bolivia hosted in younger rocks fewer than 23 million years old. The Altiplano basin is a high-elevation sedimentary trough spanning the vast Altiplano plateau between two ranges of the Andes and hosts over 75 per cent of the world's lithium in high-concentration salt flats.

About Metalero Mining Corp.

Metalero is a Canadian-based junior exploration company focused on copper, silver and gold projects in the Americas, including continuing acquisitions in Bolivia. Its 173-square-kilometre, road-accessible Benson project in Northern British Columbia has served as Metalero's flagship and is host to five prospects containing copper and gold within porphyry-related mineralized systems.

Qualified person

The technical content of this news release was reviewed and approved by Michael Dufresne, MSc, PGeol, PGeo, a non-independent qualified person as defined by National Instrument 43-101.

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