Answer:
Large as a mountain, small as a pea, Endlessly swimming in a water-less sea.
The ones who see it may go blind, Contracting the fool's madness. You have to dig to find it, Crush big stones or mine it. Wash dirt clumps in a pan and wait for it to settle, A shiny, precious metal.
I have four legs but no tail. Usually I am heard only at night.
With pointed fangs it sits in wait. With piercing force it doles out fate, over bloodless victims proclaiming its might. Eternally joining in a single bite.
A man parks his car outside of a hotel and immediately realises he is bankrupt. How did it happen?
I break away from my pack. I create holes in my victims. I can travel for miles and then disappear. I am part of a dying breed. What am I?