How much is the gold ingot of Johannesburg Museum in South Africa?

South Africa is a world-famous gold producer, and its gold output has been the first in the world since 1898. Johannesburg is a famous tourist city, known as "Huang Jincheng". It is located in the center of the world's largest gold vein, and dozens of gold mines are distributed in an arc-shaped "gold belt" of about 240 kilometers, accounting for 60% of the world's estimated reserves. 1February 886, after the discovery of gold here, gold miners from various countries followed. Due to the opening of the railway, the gold mine has been expanded and quickly became a world-famous mining city and the largest processing center. At present, it is the largest mining area in Africa and an important gold mining center in the world. Together with many surrounding industrial towns and mines, it constitutes the economic center of South Africa. 600-700 tons of gold are mined and smelted here every year, and gold ingots marked with "Rand" (400 ounces each) and 1 ounce of gold coins marked with South Africa are continuously sent to the world financial market. The wealth and luxury of Joyo are far above those of major cities in the world. The Walter waterland Gold Mine is the oldest and is still being mined. Valreeves in the west of the city is the largest gold mine in the emerging world; There is also the world's largest Rand gold refinery in the suburbs.