Percentage change in gold content only becomes positive after optimum overburden thickness and a cut-off grade of 0.90 m and 0.285 g/m 3, respectively, while the stripping ratio is 0.43:1. ![]() Average values of gravel thickness and gravel grade from both sites are 2.1 m and 0.57 g/m 3, respectively. Gold content varies at constant total gravel section grade, as overburden thickness and gold grade vary at 0.2 m from 0 to 2.0 m and at 0.05 g/m 3 from 0.10 to 0.65 g/m 3, respectively. Data are analysed using basic statistics and binary plots. Secondary data are from 48 mining blocks at Kwabeng mine and primary data from 20 mining blocks at Kibi goldfields. The specific objective is to determine sampling location, overburden thickness, gravel thickness, gravel grade and gold contents. This study uses exploration data to optimise overburden thickness, cut-off grade and stripping ratio at some alluvial gold mines in the Kibi mining district to improve gold recovery in Ghana.
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