Sichuan Hongda Co., Ltd. is engaged in non-ferrous metal zinc smelting and phosphorus chemical businesses in China, operating through its Chemical Industry, Non-Ferrous Metals Industry, and Others segments. Its products include zinc ingots, hot-dip galvanized and cast zinc alloys, and zinc oxide under the Cishan brand, as well as rare metals such as molybdenum, indium, and germanium. The company also offers agricultural and industrial-grade monoammonium phosphate under the Yunding brand, compound fertilizers, diammonium phosphate, water-soluble fertilizers containing macro-elements, biological organic fertilizers, phosphogypsum products, building plaster and gypsum products, and phosphoric and industrial sulfuric acid, along with synthetic and liquid ammonia. Founded in 1979 and headquartered in Shifang, China, it is also involved in trade, investment, metallurgy, hotels, and engineering design.