Here is a piece of excellent research on gold by Natural Resources Holdings plus an infographic from Visual Capitalist on global gold mines and deposits.
According to their website Natural Resources Holdings is a holding company focused on the acquisition, development and ownership of natural resource assets with favorable long-term fundamentals. Our investments consist of real interests in drill-defined deposits that can be advanced towards production and an investment portfolio of equity securities.
Their research aimed at answering questions such as:
How many ounces of in-situ gold exist?
How many gold mines exist in Canada?
How rare is a 1.0 million ounce undeveloped deposit?
And there is also a couple rankings on the world biggest mines.
Here is the research: