Prompt gamma-ray energy spectrum following the capture of thermal neutrons by the atomic nuclei in an alumina ore sample was measured using a HPGe detector in a borehole environment. Based on the in formation obtained from the spectrum and nuclear data the nuclear ratio that compares the content of an unknown element with an estimate of aluminium in the ore can be determined. The work aimed to explore the applicability of this technique for quality control measurements in the aluminium industry of Egypt.