The effect of high alumina cement (HAC) on some selected foundry properties of ant-hill clay was investigated. Pulverised clay, water and 5 to 40% HAC weight fractions were manually mixed, pressed and air dried at 110°C for twenty-four hours followed by firing in a kiln to 1100°C. For each property, four samples were prepared, tested and the average value reported. The results showed that the values of the investigated properties generally increased up to 15% HAC after which no significant improvement was observed. At an optimum 15% HAC, compressive strength increased from 4933.50 N/mm² to 6457.25 N/mm². In addition, refractoriness increased from 1450°C to 1600°C at this optimum weight percent. Apparent porosity was also observed to be improved in the tested samples. It was concluded that for a refractoriness value of 1600°C, the optimum mix of 15% HAC would be suitable for metallurgical furnace linings.