Answer:
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. They are the smallest you could imagine. Sooner or later everybody needs my help. Yet many people are afraid to let me help them.
A shimmering field that reaches far. Yet it has no tracks, And is crossed without paths.
Steals an event or even a mood. Reveals the truth or shatters it.
Above all things have I been placed Thus have I, a man disgraced. I describe sunlight or lock But after all, I'm just a rock
Ten men's strength, ten men's length. Ten men can't break it, yet a young boy walks off with it.
They are many and one, they wave and they drum, Used to cover a state, they go with you everywhere.