Nugget

n.	1.	A lump; a mass, esp. a native lump of a precious metal; as, a nugget of gold.
	2.	Something of value, usually found among many other less valuable things; - often used figuratively; as, a nugget of useful information in a sea of data.

Noun

1.

nugget - a solid lump of a precious metal (especially gold) as found in the earth

bar, batch, block, bulk, bullion, clod, coin gold, coin silver, copper, gob, gold, gold nugget, hunch, hunk, ingot, loaf, nickel, pat, precious metals, quantity, silver, yellow stuff