Quote from contango:
It's also tied to fears of a crash in the USD and /or US economy.
Problem is that established gold producers (who've been through the cycle many times before) are using much lower gold prices in their new mine development programs so a lot of their current exploration projects are not feasible. This has the effect of withholding potential new production even further and thus raising the price even higher. From confirming quality estimates from the boreholes it takes at least 3-5 years to bring a new gold mine into production.