South Africa is the main producer of manganese in the world. Here is the explanation:

1. Manganese Production in South Africa:
South Africa is the largest producer of manganese globally, accounting for approximately 33% of the total production. The country has vast manganese reserves, mainly located in the Kalahari Basin, which stretches across the Northern Cape, North West, and Free State provinces. These deposits contain high-grade manganese ore and are economically viable for mining.

2. Kalahari Basin:
The Kalahari Basin is a sedimentary basin that is rich in manganese. It is estimated to contain around 80% of the world's known manganese resources. The basin covers an area of approximately 2.5 million square kilometers, with the majority of manganese deposits found in South Africa.

3. Mining Industry:
South Africa has a well-established mining industry that plays a significant role in the country's economy. The mining sector contributes to job creation, foreign exchange earnings, and infrastructure development. The manganese mining industry in South Africa is well-developed and has a long history.

4. Major Mining Companies:
Several major mining companies operate in South Africa, extracting manganese ore. These companies include South32, Assmang, and Kalagadi Manganese. They have extensive operations in the Kalahari Basin and are responsible for the majority of manganese production in the country.

5. Global Demand for Manganese:
Manganese is a critical metal used in various industries, including steel production, batteries, and electronics. The global demand for manganese has been steadily increasing due to the growth in these sectors. As the main producer of manganese, South Africa plays a crucial role in meeting this demand.

In conclusion, South Africa is the main producer of manganese globally due to its vast reserves in the Kalahari Basin and a well-established mining industry. The country's manganese production contributes significantly to its economy and meets the growing global demand for this essential metal.