Sumitomo Corporation-ITOCHU Announces Investment in Tintina Mines, Canada, Participates in Dos Amigos Copper and Gold Mine Project in Chile- Accelerating active project creation through strategic partnership with the G Mining Group -

Sumitomo Corporation (Headquarters: Chiyoda-ku, Tokyo; President and CEO: Shingo Ueno; hereinafter referred to as 'Sumitomo Corporation') participated in the Dos Amigos (Project) copper and gold mine project in Atacama, Chile, through SPV (special purpose company) established with a 50percent stakeholder in the Canadian G Mining Group, which is engaged in mine development, in a strategic partnership with the Canadian G Mining Group, which is engaged in mine development. The SPV undertook approximately forty-eight million Canadian dollars of a third-party allotment of nine million Canadian dollars, conducted by Tintina Mines Limited ('Tintina'), a Canadian mine developer listed on the Toronto Venture Securities Exchange. As a result, the SPV will have approximately twenty-five percent of its stake in Tintina, and through Tintina it will have an economic stake of approximately twenty-five percent. The proceeds will be used to acquire additional interests for Tintina's ownership of one hundred percent of the project's interests, and will be used to promote the project for the final investment decision (FID).

This project is to promote the development of a copper and gold deposit located in the state of Atacama in northern Chile. In the summary economic assessment (PEA) published in 2026, the estimated amount of approximately 1.01 billion tons of Measured & Indicated Mineral Resources and 2.56 billion tons of estimated Inferred Mineral Resources (Inferred Mineral Resources) are confirmed, and an estimated amount of intravenous mineral resources of approximately 1.01 billion tonnes is expected to be in operation. In the surrounding area, mines are already being developed, and in addition to being able to utilize existing infrastructure such as transportation and power, it is also one of the advantages in development that it is located in a relatively low altitude. In addition, promising additional deposit discoveries are expected in the surrounding area, and we have medium- to long-term development potential.

Sumitomo Corporation positions copper, which is expected to continue to grow in demand in the field of natural resources, as one of its key strategic areas. In addition to participating in conventional large-scale development projects, we are strengthening our resource business foundation by discovering and creating excellent projects and increasing the value of our own, and as part of this, we are building a strategic partnership in copper upstream investment with the G Mining Group.

The G Mining Group is a group of companies that provides engineering and construction services for mining development, founded in Canada in 2006. With its high technological capabilities and unique management methods, we have completed several mining development projects within the planned process and budget for major mining companies.

In recent years, as the difficulty of mine development has increased, one of the important issues in the mining business is to realize development and construction as planned. Sumitomo Corporation is working to actively create projects by taking the lead in discovering and formulating promising resource upstream projects, including in the early stages of development, by combining the knowledge of the business operations and resource industries cultivated in the resource business and resource industry, the global network, the project composition capabilities, and the G Mining Group's high mine development and construction capabilities. G Mining Capital Inc. is a business development company jointly established and operated by Sumitomo Corporation and the G Mining Group. This project was excavated and composed through these, and shows the results of the creation of active projects that make use of the strengths of both companies.

Through its participation in this project, Sumitomo Corporation aims to ensure a stable supply of copper resources, create continuous business opportunities, and expand its resources business foundation.

Dos Amigos Mine Overview (Expected and Planned)

Location 	: 	Atacama, Chile (about 130km northeast of La Serena)

Category: Mineral species 	: 	Copper, Gold

Development stage 	: 	Summary Economic Assessment (PEA) conducted (2026)

Mining mobile 	: 	Open-pit digging

Mine Life 	: 	About twenty-five years.

Processing capacity 	: 	About 3.5 million tonnes/day

Annual production volume 	: 	About 3.7 million tons (copper), about 5.7 million ounces (gold)

Total production volume 	: 	About 90 million tons (copper), about 140 million ounces (gold)

Project interests 	: 	Tintina holds 100 percent (SPV owns about 25 per cent of Tintina shares, and Sumitomo Corporation's real interest ratio is about 12.5 per cent)

Tintina Mines Limited Company Profile

Company Name 	: 	Tintina Mines Limited

Head Office 	: 	Toronto, Ontario, Canada

Listed market 	: 	Toronto Venture Securities Exchange (TSXV)

Business 	: 	Exploration and development of mineral resources such as copper and gold in Chile

G Mining Group Overview

Group Companies 	: 	G Mining Service Inc., G Mining Ventures Corp., G Mining Capital Inc. etc.

Head Office 	: 	Quebec, Canada

Business 	: 	Engineering business related to mine development and construction, geological survey, mine design, economic evaluation, construction, commissioning, operation support, development consulting of open-air mines and underground mines, mine business (gold, copper, industrial minerals) project discovery and business investment

Major Achievements

(Completed mine development within the planned itinerary and budget) :

Tocantinzinho Mine Phase 1

Construction period

FY2021 - 2024

Country of Location

Brazil

Customer

G Mining Ventures Corp.

Greenstone Mine

Construction period

FY2021 - 2024

Country of Location

Canada

Customer

Equinox Gold Corp.

Fruta del Norte mine

Construction period

2017Years - 2021Years

Country of Location

Ecuadorian Republic

Customer

Lundin Gold Inc.

Merian Mine

Construction period

2016Years - 2017Years

Country of Location

Suriname

Customer

Newmont Corp.

In addition, many achievements including projects under construction

Website 	: 	https://gmining.com/

Related information:

Completed project finance of the project finance of the project finance of the Keplada-Blanca copper mine development project in Chile

Related information

Business Fields: Resource Group

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