Johannesburg is the largest city in South Africa, as well as the center of the province Gauteng, the wealthiest province in South Africa. It is also a center of large-scale trade in gold and diamonds, which are mined in the surrounding mountains. Being a leading city in South Africa with a population of over 4 million, Johannesburg is also the country's economic hub, producing 16% of the country's GDP. Even though the gold is not being mined in the very city nowadays, the headquarters of many mining companies are located in Johannesburg, including Gold Fields. A significant impact on Johannesburg economy has the sphere of services and the production sector. Moreover, different industries, such as the production of steel and cement play a significant role in the development of the city and country.
