gold dust

from The Century Dictionary.

• noun Gold occurring naturally in a state of fine subdivision.—
• noun A plant, Alyssum saxatile, so called from the profusion of its small yellow flowers. Also called goldbasket.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun Gold in the form of very small pieces, or flour gold.
• noun figuratively Anything of great value.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun the particles and flakes (and sometimes small nuggets) of gold obtained in placer mining