Given none of the supply chain and infrastructure to support mining and retrieval exists, it would need to be researched and constructed. That money would be invested in the market and flood down for tooling, manufacturing and manpower.
Once you have the rock, you'll need to process it into usable materials.
Low price gold flooding the market may be bad short term, but there are processes that will benefit from cheap gold in manufacturing. The market will stabilize.
It is more than just magicing the rock to someone's bank account in liquid currency. There is a lot of money they will have to put in up front before they would see a financial return.
