Gold does not really change very much in price at all, for hundreds of years its value has been pretty much constant.
It is the dollar that fluctuates, and goes down. There is no “bubble”. The only thing there is, is an inverse relationship between gold and the US dollar.
To answer the question what would make the price of gold go down in price in terms of US dollars, the answer is that the US dollar must go up.. What it would take, would be to elect somebody like Ron Paul who would cut spending by 1 trillion dollars in his first year.
Other than electing Ron Paul, then the value of the US dollar will continue to steadily decline and thus the price of gold in US dollars will continually go up forever.
Ron Paul wouldn’t, couldn’t, cut $1 trillion in spending.
Electing one person, even to POTUS, isn’t going to change much of anything. The Congress would just pass the spending with 2/3 in favor.
Until we are broke, nothing will change. Only when the dollar is worthless, and government largess is also worthless, might people elect a majority of representatives that only want to contain government.
It's been sinking into the Earth to the depth of 6 to 18 inches for the last 12,500 years.
The problem is it's in microscopic particles so you can't just see it or pan it. You first have to "concentrate it", then use various systems to pull it out.
This stuff has been mined successfully by ancient stone age societies.