CGA production process starts from bauxite ore mining which is conducted by PT ANTAM Tbk’s West Kalimantan Bauxite Mining Business Unit. Bauxite production originated from Tayan bauxite mine in West Kalimantan. The mined bauxite is fed for consumption at the Tayan CGA plant in Tayan, West Kalimantan. The mine is conducted with open pit methods with truck and excavator. After the ore is mined, the ore is washed and screened to be transported to the Tayan CGA plant, which is located next to the mine.

In general, the term CGA refers to chemical products in the form of aluminium hydroxide and alumina used for various industrial applications except for aluminium industry. Aluminium hydroxide is a semi-finished product that can be used for water purification. While alumina can be used to produce electronic support components. Some products that use CGA include refractoriness, abrasive, assembled products, integrated circuit (IC), as well as basic materials for LCD screens. Alumina processing in Tayan will produce chemical grade alumina products by processing bauxite ore through the Bayer process into alumina products with a nameplate capacity of 300,000 metric tons of Al₂O₃ (alumina) base per year. The Bayer process consists of three stages, namely Liquor Clarification process, Precipitation Process, and Calcination Process.

The product of the Bayer process consists of two products, namely alumina trihydrate and alumina. Alumina trihydrate will be processed in the path of hydrate processing. The hydrate processing will proceed postproduction aluminium trihydrate from the hydrate production process by using various processes to meet product specification by performing size changes as well as other treatments such as coating and de-ionizing. The result of processing of alumina trihydrate will be packed in jumbo bag and paper bag ready to be sent to the consumer.

The alumina product which is the process of calcination will be processed further to meet the specifications of consumers. This further process involves mixing and filtering of the alumina blending. Alumina that has been in blending, will be packed or given further treatment. Then, the result of the processing of alumina will be packaged to be sent to the consumer.