Mr Gemell has more than 45 years of experience in the mining industry, having worked throughout Australasia and in Africa, North and South America, Asia, Eastern and Western Europe. He has been Principal of Gemell Mining Engineers since its formation in Kalgoorlie in 1984, specializing in mineral property assessment, strategic studies and valuation. He was an AusIMM representative on the VALMIN Committee from 2010 until 2021 and was also a VALMIN representative to the International Mineral Valuation Committee (IMVAL), which he chaired in 2018 and 2019.