Numerous studies have examined the relationship between a critical mass of women on corporate boards and firm performance. Despite convincing arguments that racially diverse board members contribute positively to the board's management oversight and strategy formulation responsibilities, literature examining race in the boardroom has been very scant and racial minority directors remain persistently under- represented on corporate boards. The purpose of this study was to examine whether a critical mass of 30% Black directors on boards and audit committees of public companies performed better than companies with less than 30% Black directors. The study was conducted using the mining and financial services companies listed on the Johannesburg Stock Exchange. Quantitative research methodology was utilized to test the financial ratios of ROA, ROE, Tobin's Q, Share Price, P: E Ratio and Dividend Payout with companies that had a minimum of 30% Black directors compared to companies with less than 30% Black directors. The study revealed that there was no relationship between either a critical mass of Black directors on boards and financial performance or between a critical mass of Black directors on audit committees and financial performance. / Dissertation (MBA)--University of Pretoria, 2013. / ccgibs2014 / Gordon Institute of Business Science (GIBS) / MBA / Unrestricted