Abstract A radiological impact assessment (RIA) onto environment from radioactive minerals of amang and ilmenite was carried out in an amang processing plant at Dengkil, Selangor, Malaysia. The RIA was based on maximum total doses received by residents and industrial workers with the assumption that the area will be turned into a residential or industrial area once the plant is closed. RIA was based on a land area of 20,000 m 2 with 0.2 m thick contamination zone. Result was obtained by comparing with the limits prescribed by Atomic Energy Licensing Board of Malaysia (AELB), which is 1 mSv y −1 for public. The parameter input was based on the study location specific value, existing value in RESRAD and suitable estimation values based on sensitivity analysis. Based on two scenarios, the predicted maximum total doses received by residents and industrial workers in extreme condition are 10.41, 1.94, 35.03 and 35.0 mSv y −1 each exceeding the dose limit for public. Nevertheless, with the use of soil cover with thickness between 0.1 and 1 m and ventilation rates between 1 and 10 h −1, these maximum total doses can be lowered to levels not exceeding the set dose limit and the area can be used safely for residential as well as industrial purpose.