The water, as you can see from its colour, comes from the glacier. No gold there.
And the gold? Well, at settlement 55% of Icelanders were Irish women dragged along against their will and making the most of it. I suspect a leprechaun or two came along, because leprechauns like to hide a pot of gold at the end of a rainbow, and, well…
And what is a glacier? Why, just look at it: white gold, of course.