Social initiatives
Recognizing our responsibility as a member of the local community, we focus on making a quiet, positive impact on the Nagasaki and Sakito communities and creating working environments where people respect human diversity.
Serving as another source of water for the community
Diasalt’s community activities trace back to efforts to support the lives of local residents in Sakito, Nagasaki.
When Mitsubishi Mining Corporation (now Mitsubishi Materials Corporation) established the company in 1955, it entrusted our salt manufacturing business with an important mission: to deliver distilled water—a product of the salt-manufacturing process—to area islanders, who were suffering from a severe water shortage.
It was a call to leverage technology into changing the way of life on remote islands where water was in short supply.
In the past, it was extremely difficult to secure water for day-to-day life in Sakito due to its remote location. Prior to the establishment of our company, “water boats” would haul 1,500 to 2,000 tons of water a day from the opposite shore to supply the townspeople—but even then, there were days when the community went without drinking water.
When our operations began, we used the distilled water from our salt-manufacturing operations to supply the town with 2,300 tons of distilled water every day.
That was enough to supply water to the more than 10,000 residents living in Sakito at the time.
Creating salt is creating an environment.
To this day, we have continued to supply the community with distilled water throughout the year. We are determined to completely eliminate the water insecurity of the past and continue to protect the environment, giving local residents a place they can live without worrying about their water supply. This commitment, part of our philosophy since our founding, remains deeply rooted in the DNA of our business.
Marine Day coastal cleanup: Quietly giving back to the community
Marine Day (a July national holiday) is an important day, created as a day to express gratitude for the blessings of the sea. Supported by the rich natural gifts of the Goto-nada Sea, we continue to celebrate Marine Day by cleaning up the coast of the Sakito community we operate in.
Starting close to home, one step at a time
Employees volunteer to pick up trash along the beach not as a special event but as an extension of our daily activities to improve the local environment. We keep the sea—our workplace—clean with our own hands. For us, that simple sense of goodwill matters.
Showing our gratitude to the community
Our activities are also a small way to give back to the Sakito community, which has taken such good care of us since we got our start. We want to engage and connect with the environment the same way that a local resident would and pass on the beauty of the place to the next generation.
Carrying our commitment to the environment, never changing, into the future
Consistent, sustained effort, staying steady from year to year, is something we value. Knowing how vital the sea is to what we do, we will continue to respect nature and value our roots in the local community.
Promoting diversity
Empowering women
We will continue to cultivate working environments where female employees can make full use of their abilities.
Percentage of female managers: 8.7% (as of May 2026)
Empowering people with disabilities
We hire people based on their individual abilities and motivation, regardless of whether or not they have disabilities. We will continue to strive to create workplaces where employees with disabilities can play an active role.
Work-life balance
To help employees deal with different life situations, we support diverse, flexible work styles that respect individual circumstances and allow each person to reach his or her full potential.
Systems to support a diverse mix of work styles
To give people as much freedom as possible to choose when, where, and how they work and help them maximize individual performance, we have introduced flexible hours and teleworking systems for different types of work.
Encouraging men to play a more active role in childcare
At Diasalt, a growing number of male employees—including those in management positions—take childcare leave. We will continue to explore more forms of support to enable male employees to take active part in raising their children.
Average number of days of childcare leave taken by male employees: FY2020 result: 0 days ⇒ FY2025 result: 14.3 days
Clubs
Outside of work, we support club activities to help deepen and enrich connections among employees who share hobbies. One example is our softball team, which has established a reputation as a powerhouse. In 2022, the team represented Nagasaki in the 19th National Men’s Softball Tournament.
Environmental initiatives
Environmental management system
Registration Number：JQA-EM1633
Our Sakito Plant has received ISO 14001 certification, the international standard for environmental management systems.
We ensure that our business activities are environmentally friendly by taking a variety of measures, such as promoting resource and energy conservation, reducing waste, and mitigating environmental risks,
and make continual improvements along the way.
Through our environmental conservation activities, we will continue to contribute to society.
Efforts to reduce CO2 emissions from manufacturing processes
Reducing emissions through new business development
While our conventional salt manufacturing method uses coal fuel to crystallize seawater, the approach for our new Sunny Dia product involves washing sun-dried salt via a proprietary washing technology with nothing but pure water. The method reduces the CO2 emissions of the process, from washing the sun-dried salt to the packaging process, by approximately 96% compared to the conventional production method (based on an in-house comparison).
This sustainable, environmental impact-reducing manufacturing method was patented on January 5, 2026 (Patent No. 7799119).
Efforts to achieve zero emissions by 2050
As the entire Japanese salt industry aims to achieve the target of virtually zero emissions by 2050, we are also exploring initiatives to reduce our CO2 emissions by switching from our current variety of coal, the main fuel source for our existing manufacturing methods, to higher-calorie types. We are also looking into the possibility of gradually introducing biomass fuels as we approach 2030.
Waste Disposal Records and Proper Maintenance and Management
Reducing our environmental impact is a key issue for us, and we are committed to proper waste disposal and transparent information disclosure.
■ Ensuring the proper disposal and self-management of industrial waste
Instead of outsourcing the treatment of coal ash generated by our fluidized-bed boiler operations, we dispose of all our coal ash at a controlled industrial waste-disposal site that we manage responsibly ourselves.
By maintaining and managing our own disposal facilities to standards that are even more rigorous than what laws and regulations require, we work to minimize our impact on the surrounding environment and ensure safety for the long term. By maintaining and managing our own disposal facilities to standards that are even more rigorous than what laws and regulations require, we work to minimize our impact on the surrounding environment and ensure safety for the long term.
■ Disclosure of maintenance and control information
In accordance with the Act on Waste Management and Public Cleaning, we also disclose information on disposal and maintenance. As a company that supports infrastructure that society takes for granted, Diasalt is committed to doing our processes the right way and building trusting relationships with the local community.
