Gold In Them Thar Hills
This small mod adds simple ways to pan for gold, both manually with gold pans and passively through sluices.
By right-clicking with the gold pan, or running water over the sluices, you can generate gold nuggets.
License, source, documentation, and wiki are on Github: https://github.com/thinkplank/goldinthemtharhills
Find me on Twitter: @Lapiman or @theycallmezeal.