According to some experts, after the peak is reached, the production rate will slowly decline until it reaches near zero while the price shoots upward. At that point, we will have pretty much mined all the economic ore deposits that are present on the planet.

...the tax rate for an incorporated, small-scale mine or mining-related business will be reduced from the former 35 percent rate to 21 percent for the 2018 tax year and thereafter.

Some financial commentators have speculated that bitcoin and other virtual currencies have captured a portion of funds that would have been invested in gold. I find it a bit ironic that people who invest in precious metals would even consider another fiat currency.