was appointed as the mining commissioner for the area. On 8 November 1886 a diggers' committee was elected to assist the mining commissioner in the execution of his duties. The earliest mining activities were concentrated along and adjacent to the outcrops of the main reef. Initially the diggers could perform the work themselves, using relatively little equipment. As the pits grew deeper, they needed additional labourers and machinery. Black Africans were recruited to perform the unskilled work. Machinery had to be imported from Europe and fuel had to be found to power the machinery. The discovery of coal on the far east Rand at Springs and Boksburg, as well as the construction of the Rand Steam Tram from the colliery to the gold fields and into Johannesburg facilitated the growth of the industry in its early years. Soon, too, the railway arrived from the coast: in September 1892 the Cape railway reached the Rand. Two years later the line from Lourenço Marques (now Maputo) arrived in the Republic and a third route was opened from Durban the next year. In 1890 the MacArthur-Forrest cyanidation process successfully overcame the problems of treating the refractory ore from deeper levels. It soon became apparent that individual diggers were not equal to the task of mining gold in Johannesburg. Wealth could only be recovered by means of deep-shaft working and by capital-intensive companies having the necessary technical skills. Individual claims were soon joined into small mining groups. The amalgamation of smaller mining groups became a common occurrence and by 1895 the scene was dominated by a limited number of large monopolistic companies. These companies were: the Wernher-Beit-Eckstein group, Consolidated Goldfields, the J B Robinson group, the S. Neumann group, the Albu group, the A Goerz group, the Anglo-French group and the Lewis-Marks group. Of these, Cecil John Rhodes's Consolidated Goldfields was the most important. In 1893 Johannesburg's first stock exchange was opened. From then until today Johannesburg has been the seat of the South African stock exchange and the country's financial heartland. The Johannesburg Stock Exchange is presently in Sandton, Johannesburg. The Zuid-Afrikaansche Republic became the single biggest gold producer in the world, with a contribution of 27,5 percent in 1898. Founding of a city The fledgling town of Johannesburg was laid out on a triangular wedge of "uitvalgrond" (area excluded when the farms were surveyed) named Randjeslaagte, situated between the farms Doornfontein to