Soil that expands and contracts in response to changes in water content is commonly referred to as ‘expansive soil. It has low load-bearing capacity when in contact with water, and makes it unsuitable for any construction. Therefore, for construction on site containing black cotton soil, there are only two alternatives available one is to remove black cotton soil from the site or amend the property. Alumina production is increasing day by day. In 2021 approximately 200 MT of red mud was discharged from 135 MT of aluminum production worldwide, and India is the 2nd highest producer of alumina. Therefore, the alumina ore mining waste is increasing tremendously, resulting in higher mine waste generation requiring disposal/utilization. This waste is occupying precious land on the one hand and contaminates land and ground water on the other. The basic objective of this study is to improve the engineering behavior of expansive soil by using the optimum quantity of alumina mine ore waste that can be used as an additive to soil. This is being determined and reported. Black cotton soil has been obtained from the Chitrakoot district in Uttar Pradesh, and alumina ore waste has been procured from mines of Sagar district Madhya Pradesh. For this purpose, alumina mine ore waste at 8, 12, 16, 20, 24 and 28% as additives to the soil by weight have been used. The analysis of the results was based on the test results for soil and waste characterization, optimum moisture content (OMC), Maximum Dry Density (MDD), Unconfined Compressive Strength (UCS), and California Bearing Ratio test (CBR). An Optimum amount of mine ore waste that can be mixed with black cotton soil has been determined and reported.