 Ten months later, after Paley's death, Coghlan and his elder brother formed the firm of Coghlan and Coghlan.Kimberley's position at the epicentre of the diamond trade led the brothers to develop expertise and a formidable reputation for their work in the mining industry.Rhodes outmanoeuvred his main opponent Barney Barnato and brought all the mines under the control of his company, De Beers, in 1888.