South Africa
It is unknown to which country you are referring to. Canada? Australia? The United States. So I will give examples for all three. The biggest gold rushes in the US occurred in California and Alaska. The largest gold rush in Canada occurred in the Yukon. The largest Australian gold rush occurred in Victoria.
The Homestake Gold Mine in South Dakota was the biggest gold mine in the western hemisphere when it was in production, but this ceased in 2001.The Yanacocha Gold Mine in Peru now holds the record for the largest working gold mine in the western hemisphere.
homestake
Gold City and Diamond Town are NOT real cities.
europe
South Africa
Brazil is a major producer of gold as well as Suriname and Guyana
None of them. It is the second largest producer of silver, behind Peru. It is also on the top 20 of gold production, and the diamond production is almost negligible.
South Africa
China has surpassed South Africa in largest production of gold.
China has surpassed South Africa in largest production of gold.
The largest gold producing country in the world is Soth Africa. It is also the largest diamond producing country in the world. It mines more than 100 kg of gold per day. China is largest gold producing country - 403t in 2012.
China has surpassed South Africa in largest production of gold.
Austrailia!
China has surpassed South Africa in largest production of gold.
Australia's diamond mines are major exporters of diamonds. For example, the Argyle Mine produces about eight million carats (1,600 kg) per year, and is the fourth largest diamond producing mine in the world, by volume. This is according to its Wikipedia page.