Not sure how much gold China has including mines in Africa as potential output, but Nevada and that's not even counting the gold still in the ground is rated as a world class gold source and has produced well over 3million troy ounces in modern times with more than that in estimated reserves still in the ground. most all of the companies mining are Canadian owned. IM not familiar with numbers that large ,but at 3800 $ an ounce {troy} , X 3 mill, is a chunk of change, so if Trump decided to Tariff Canadian mining companies in Gold I suspect we would be the worlds largest holder. Gold is like the stock market, its worth is what people say it is and will pay . { simplistic ] but unless the gov. steps in and sets the price its a free market value based on peoples fear or confidence.
Heck I know where there are old gold ,silver and copper mines from the 1800s still sitting idle some have steel gates on them some dont and some are on maps and some aren't. My wife and I have explored around and found alot of old mines so the resource is no where depleted considering modern mining technics.
On a side note I read that a world class lode of rare earth has been discovered in Wyoming so that is taken care of also , besides our oil reserves , gold reserves and food producing farms, and ranches we are blessed if we could just solve our idiot woke problem!