Chugai Mining Co., Ltd. operates across three core segments: precious metals, machinery, and contents. The precious metals business, conducted by the parent company and subsidiary JACK DIAMOND Co., Ltd., encompasses the sale of precious metals, art, and jewelry, as well as the production and sale of gold, silver, platinum, and palladium, including the purchase and resale of non-ferrous metals containing gold and silver. The machinery business, operated through subsidiary Intex Co., Ltd., focuses on the procurement and sale of used machine tools and sheet metal machinery, while the contents business handles the planning, design, manufacturing, and sale of toys, recreational products, and character merchandise.