Our recent real estate bubble then crash was not due to the fact that land area remains constant.
It was due to easy money property speculation, banks who loaned money to people who never should have been allowed in the lobby (as poor as their credit was) and, most of all, banks who wrote loans then sold them off to investment banks and insurance companies so that they could be "securitized" then passed along to other suckers and so on.
The real estate boom was built on a house of sand and fog.
The value of gold, silver and other precious metals remains constant. It is the value of the dollars that they are priced in that fluctuates.
When you make more of something the already existing units of that something are worth less (dollars, for example).
If a miner found a deposit of gold equal to the amount that has already been mined all over the globe, then the price of gold would be cut in half immediately. It is a simple matter of supply and demand.
What you are seeing with the precious metals is not a bubble or a boom...it is merely a reaction to the intense money printing done by central banks around the world.
Here is an experiment for you:
Go out to the street and offer someone a choice between $1374 or the amount of cash (in dollars) of one ounce of gold as it was priced in 1998 (only 12 years ago).
People who understand the relationship between gold prices and inflation may counter by giving you a one ounce gold coin as an even trade. ;)
Disclosure: Long Real, Sound Currency