Yesterday the President of the largest gold mining and production company, Barrick Gold, noted that after ten years of declining production it is time to recognize that the world has seen the peak in gold production. To maintain production ore is being mined with increasingly less gold in it. (The grade of the ore, or metal content, defines whether it is profitable to mine.)

Ore grades have fallen from around 12 grams per tonne in 1950 to nearer 3 grams in the US, Canada, and Australia. South Africa's output has halved since peaking in 1970.