That won't work because the amount of goods circulating grows a lot faster than gold comes out of the ground.

Say you have 100 units of assets in the world and 100 units of gold. This means each gold-dollar is worth 1 unit of assets.

Now the economy grows, and some mining happens. You have 200 units of real assets, and 160 units of gold. This means each gold-dollar is worth 1.25 units of assets.

Money is a unit of measurement, and you had to stretch that unit.

Bringing back a gold standard is a sure-fire way to create deflation, and all the problems that come with deflation.

If you know your money is gonna rise in value, would that encourage you to spend it? No; your best move is to be thrifty. Spending goes down and businesses go bust, because of the dysfunctional unit of measurement.

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That's not even looking at the sudden catastrophic destabilisation of gold prices that will happen the day the first asteroid is mined.