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How fast does the available amount of gold in the world increase due to mining?
Approximately 5.3 billion ounces have been mined. This puts the total value of all gold in the world at about $9.5 trillion, based on $1800/oz. Total world net worth was $125T in 2006. There's an odd thing that happens when one asset's value is suddenly such a large percent of all assets. (This reminds me of how and why the tech bubble burst. Cisco and EMC would have been worth more than all other stocks combined if they grew in the 00's like they did in the 90's.) Production (in 2005/6) ran about 80 million oz/yr. Just over 1.5% impact to total supply, so you are right in that observation.  On the other hand, the limited amount out here, means that if everyone decided to put their wealth in gold, it would be done by driving the price to bubblicious levels.  One can study this all day, and parse out how much is in investment form (as compared to jewelry, etc) and realize that a few trillion dollars in value pales in comparison to the wealth of the US alone, let alone the world. Half the world can't buy two oz if they tried.  Of course there's pressure to reopen mines that had costs pushing $800/oz. Understand that the supply of $300 gold is long gone. As the easy gold has been mined, and cost goes up, there's a point where mines close. But as the price of gold trades at these levels, the mines that couldn't produce at $600 are now opening.