The Egyptian tailings, those of Turkey, Greece, Afghanistan, Peru, Mexico, California and all the other sites of major gold strikes will be reprocessed and gold's price will fall to the level dictated by the demand for gold in industry.
Perhaps, but it's a bet I'm willing to make. If you were to convert M3 into gold, gold would be worth around $30,000 per ounce. Those bacteria sure have their work cut out for them!