We have established the Environmental Management Panel to be a dedicated subcommittee under the SCQ Promotion Office that formulates and implements Group-wide environmental measures. We appoint environmental management supervisors for each business division and manufacturing site. They work to prevent pollution and ensure compliance with environmental laws and regulations by collaborating closely with the head office environmental management department.

In accordance with its Environmental Policy, the Mitsubishi Materials Group identifies environmental risks it faces and takes measures to prevent such risks from materializing.
Pollution of air, bodies of water, soil or groundwater by hazardous substance leaks, or inadequate treatment of industrial waste could have a detrimental impact on the environment, as well as a serious impact on our business activities as a group. We carry out risk assessments in line with the nature of our business activities, the substances that we handle, and the locations of individual sites, and take action as necessary. In addition to preventing inadequate waste treatment at our own departments, we take steps to ensure that we do not overlook inadequate treatment by contractors by taking measures including on-site confirmation.
At the closed mines (non-ferrous metal mines) we own, in order to prevent mining-induced pollution, we continue to maintain tailings dams, mining tunnels and mining water conduit, and to appropriately process acid wastewater containing heavy metals generated from these locations. Biodiversity is also an important environmental risk for us. At the mines from which we procure raw materials (such as ores), we have established environmental and social standards, including standards for the conservation of biodiversity, and we confirm our compliance with these standards. In addition, we manage the company-owned forests in Japan to ensure a high level of ecosystem services from them. They fulfill a certain standard that has been assured by our acquisition of a forest certification.
To reduce climate change risks, we take multiple approaches for the conservation of energy and the reduction of CO₂ emissions. We also study CO₂ capture and use, and generate renewable energy. Regarding the risk that a shortage of freshwater resources could impact our business activities, we conduct risk assessments for our major facilities in Japan and overseas and take measures including the effective utilization of seawater, water conservation through the improvement of the efficiency of the production process, water recycling, and ensuring that wastewater is treated and purified.

We operate environmental management systems under the ISO 14001 standard and other environmental management systems at our sites. Under those systems, we engage in continuous activities to ensure compliance with laws and regulations and improve our environmental performance. We have worked to develop and implement environmental training programs and legal checking systems to cultivate managers who possess knowledge of environmental technologies, laws and regulations.
In particular, the Group regards waste management as a key business process and promotes the use of recycled raw materials, such as in our metal smelting and refining business. We appoint staff who are responsible for waste management and those in charge of practical operations at each facility. We provide training on laws and regulations and apply strict operating rules in our efforts to ensure appropriate waste management and compliance with relevant laws and regulations. We provide education for staff responsible for waste management with the aim of understanding waste risks and the roles required by introducing the latest case studies on waste management. For staff in charge of practical operations, we organize seminars for understanding the specific regulations of the Waste Management and Public Cleansing Act.

To handle the environmental issues that arise at our sites, we have established an office providing the consultation services of staff specialized in environmental issues, at our head office. This office provides detailed support, ensures that useful information is shared between the head office and other sites, and responds to environmental issues.
We hold an annual Meeting of Administrative Managers Responsible for Environmental Management for management-level staff at our facilities. At these meetings, we share information about environmental measures and issues. In addition, we give annual site tours for environmental management supervisors. 

Among the following disclosure items, energy input includes data from sites belonging to the polycrystalline silicon business and salt manufacturing business.

We keep all our sites up to date on changes in legislation applied to the Mitsubishi Materials Group by providing information via intranet or email. In the event of major revisions or revisions requiring measures such as equipment upgrades, we hold explanatory meetings to share information on the requisite measures and ensure that all our sites are prepared to take appropriate action.
Current laws and regulations are checked periodically at each site. In addition, the Internal Audit Department checks the status of compliance with environmental laws and regulations, how chemical substances are handled, how equipment is managed and so on. When a noncompliance is discovered we correct it promptly and share information about it with related sites as part of our efforts to improve the level of management in the overall Group.
In the event of installation of new facilities, facility upgrades/changes, or any other projects involving new operations above a certain scale, individual sites as well as relevant head office divisions determine what notifications they are required to submit.

With regard to our compliance with environment-related laws and regulations in the fiscal year ended March 2024, including water pollution, air pollution and waste disposal, we were not subject to any adverse dispositions (revoked permits, orders to cease operations, orders to stop use of equipment, fines, etc.) by regulatory authorities.
We received 3 complaints regarding weed and tree growth, as well as operational water intake. For all of these we promptly investigated the causes and implemented the necessary countermeasures.

The Group uses manufacturing processes that emit air pollutants such as dust and sulfur oxides (SOx) as a result of burning fuel, etc. In particular, emissions from our copper smelters and refineries account for the majority of those emissions. Each site is working to suppress emissions of air pollutants by stabilizing and increasing the efficiency of operations that generate emissions, and by installing advanced waste gas treatment equipment and maintaining appropriate performance.

To prevent water pollution, at all of our sites we appropriately treat effluent and impose wastewater management standards that are even stricter than those required by law or municipal ordinance. In addition, to ensure we are ready to deal with leaks of chemical substances or oil spills, we take measures such as installing dikes and inspecting equipment on a daily basis. We also conduct regular training aimed at preventing the spread of substances in the event of a leak.

The Group’s manufacturing plants handle a diverse range of chemical substances. Each site is implementing measures to reduce environmental risks, such as reducing the use of hazardous chemical substances, preventing their leakage into the environment, and reducing emissions. Specific initiatives include the review of processes according to the characteristics of each chemical substance, the installation of new equipment, as well as the switch to less hazardous alternative substances.

Our Group's Efforts to Reduce Industrial Waste Emissions

Our Group is committed to reducing industrial waste emissions generated through our business activities to contribute to building a resource-recycling society.
Specific activities at manufacturing sites include increasing the rate of converting packaging materials and auxiliary materials for raw materials into valuable resources, and reducing sludge generated during wastewater treatment in the manufacturing process. Furthermore, our Group has set targets for reducing industrial waste emissions across the entire organization.

"Reduce industrial waste emissions per unit of sales (sales-to-waste ratio) by 6% in the fiscal year ended March 2031 compared to the fiscal year ended March 2024."

The Company falls under the category of large-volume waste generating business operator (a business operator generating at least 250 tons of industrial waste from plastic products a year) as defined by the Act on Promotion of Resource Circulation for Plastics. The Company has set targets concerning the reduction and recycling of industrial waste from plastic products as required by this designation, and is working to switch from heat recovery and landfill disposal to resource recycling.

• Switch to material recycling for the packaging plastics used for Company products
• Reduce the amount of plastic materials used in site business activities, consider the use of alternatives or switch to material recycling

The amount of industrial waste from plastic-using products, etc. in the fiscal year ended March 2025 was 997 tons. Of this amount, 685 tons was plastic that was not recycled (heat recovery, landfill, etc.), resulting in a 39% reduction in emissions and recycling compared to the fiscal year ended March 2022 (1,115 tons).
We ascertain the actual plastic waste generation of each Group company to confirm whether any fall under the category of large-volume waste generating business operators, and promote waste reduction and recycling activities.

In the fiscal year ended March 2025, we invested approximately \2.7 billion in areas including construction at the Tohoku Power Service Station of the Komatagawa New Power Plant (hydroelectric power plant) certified as a renewable energy power generation facility, and the renewal of equipment at copper smelting and refining plants, with the goal of preventing air pollution and water pollution.
Costs associated with environmental preservation came to around \6.0 billion, including environmental measures such as exhaust gas treatment, wastewater treatment and waste disposal, as well as the maintenance and management of equipment to prevent pollution, waste disposal, and maintenance of anti-pollution facilities, etc.

We are a company with its origins in the mining industry. The Mitsubishi Materials Group owns a wide range of mines around Japan, including limestone, coal and nonferrous metal mines, such as copper, lead and zinc mines. Operations at all of our non-ferrous metal mines have now been suspended or discontinued. Currently, we are managing 20 closed mines across 15 locations. We have continued to implement the following controls and management programs for our closed mines on a long-term basis, pursuant to Article 5 of our Code of Conduct, which states, “[Environmental Management] We will work to manage our environmental impact and promote decarbonization, make efficient use of natural resources, and accelerate recycling.”

• Appropriate treatment of the heavy metal-containing wastewater (acid mine drainage) released from former mining sites
• Management of tailings dams (sites used to store rubble from mining minerals, slag and sediment from mine drainage treatment).
• Inspection and maintenance of excavated mine underground spaces, drifts and channels for conducting mine drainage
• Safety measures to prevent unauthorized entry at disused mine mouths and subsidence sites

We continue to preserve and maintain sections of mine drift in some closed mines as cultural heritage sites or tourist facilities to exhibit their former conditions and preserve historical mining technologies for future generations.

Broadly speaking, acid mine drainage can be generated in two ways. There is the acidic water in the pits (mine water) containing heavy metals, generated through contact between oxidized minerals and rainwater and groundwater, which can fill the underground pits and mining cavities formed in mineralized belts due to mining operations. Then there is the permeated water (wastewater) generated when small amounts of heavy metals, which are contained in slag and other substances in the tailings dams, come into contact with rainwater and surface water. The acid mine drainage goes to processing plants, where it undergoes neutralization and the removal of heavy metals. The water is then discharged into rivers at water quality levels that fall within wastewater standards.

Since 2015, our Group has been implementing responses to deteriorating natural disasters and other risks by conducting protective construction to guard against contamination, as well as reinforcing tailing dams to prevent uncontrolled release of slag and sediment in anticipation of a major earthquake, reducing wastewater at the source, strengthening the capacity of acid mine drainage treatment facilities, and upgrading aging facilities. We recorded an environmental countermeasure reserve for work expenses from the fiscal year ended March 2016 to the fiscal year ended March 2019, and in the fiscal year ended March 2023 we appropriated some additional funds to cover expenses for the repair and toughening of locations damaged due to torrential rains.

To promote local residents’ knowledge of our measures for preventing mining-induced pollution at our closed mines, we proactively hold sessions to explain countermeasure work and offer facility tours. We also strive to take part in environmental conservation activities and contribute to local communities through tree-planting and the release of juvenile fish, as well as participation in and cosponsoring of local events and festivals. In addition, we accept inspection tours of our mining facilities by students and researchers from Japan and overseas. We thus offer our facilities as locations for research and development and skills training related to the prevention of mining-induced pollution.