Geologist blogger The World Complex has an interesting chart of global
exploration expenditure by commodity, noting that “approximately
50% of all money spent on non-fuel mineral exploration during the last 15
years was spent on gold exploration” with copper being the second
most important at around 20%.
Why such interest? It is not
only because gold is so expensive, but also because of its [source: U.S. Geological Survey]:
• demand in aesthetic and technological
profitability (in terms of revenue minus costs)
widespread geological occurrence in relatively small deposits
Since we’ve only extracted
around 170,000t of an estimated 390,000t of
mineable gold, it looks
like there are many more years for gold fever to continue.