Water from hydrothermal systems and that otherwise come seeping out of the rocks may have picked up some Gold in its way.One thing I do know and that is that the old miner said that gold grows, I always thought it was an old story.
But I have looked in old mines in the old timber that water is depositing small layers of a mineral very similar to gold.
i never test it,but old miner said that is gold deposit in those old timbers inside the mine.
is crazy but is true.
It means that there is gold dissolved in that water of some mines.
and deposit when touched some kind of metals or woods.
Some scientists say that the gold nuggets in some rivers grow when the gold dissolved in those waters touches them.
for that reason we saw in museum Gold nuggets so big that I doubt it came from a vein.
It is ripe good conditions in our Earth, high pressure high heat and acidic conditions.
Most will have deposited on the quartz and minerals it has met on its way to the surface.
But an every so slight amount may have been able to reach the surface.