Seng Kasari Marble Mines and Factories Group started its activity in Zanjan Province in 1368 with the aim of extracting and processing mineral materials and decorative (building) stones, and this group after success in exploring, equipping and exploiting various construction stone mines and mineral materials such as silica, feldspar and kaolin, in order to produce and process all kinds of marble stones, especially travertine, marble and marble, in 1387, he established a processing factory under the name of "Seng Kasri Marble Industries" in Zanjan Industrial Town No. 1, which this production unit By using the world's technology and the latest machines belonging to the Italian company "Berton", it has the ability to produce and process 600,000 square meters of building stones in the form of tiles and slabs with high quality and accepted by the world markets. Exporting to the countries of the Persian Gulf, East Asia, Russia, and Europe directly and indirectly proves the quality of the products and the capability of this industrial unit.