If there is more gold, it's value should go down. The price should only go up when supply becomes limited, or some new thing demands more than usual.
Gold has a lot of practical use, but because it's value is hyper inflated it is almost always more cost effective to use a cheaper material. Which, incidentally, is driving the cost of those materials up.
I'm not saying gold should be the same price as copper. I am saying that in a rational environment the prices should be comparably similar.
As it is, gold is 10,000 times as expensive as copper.