Deon was part of the Due diligence team of Durban Roodepoort Deep “DRD” that did several due diligence exercises at various projects including the Hartebeestfontein Mine in the Klerksdorp region, NW Province, South Africa. Hartebeestfontein was owned by Anglovaal and was acquired by DRD in 1998. The Hartebeestfontein Mine was merged with DRD’s Buffelsfontein Gold Mine to form the new DRD NW Operations. NW Operations produced between circa 900 and 1200kgs of gold per month

Deon as the Managing Director of Simmer & Jack, a JSE listed Gold Mining Company acquired the Tau Lekoa Mine in the Klerksdorp region, NW Province, South Africa from AngloGold Ashanti in 2011. The transaction consideration was R600m (64m USD) and was concluded in early 2011. The acquisition also included the Weltevreden and Goedgenoegd Mines.