Here are a couple of areas to search for Lewis County Washington gold:
1.5 miles above Longmire, on the western slope of Eagle Mountain, near the NW corner of section 27 T15N R8E, is the Eagle Peak Mine. This was a copper mine that produced a by product of gold.
On Mineral Creek, you can find the Waterfall Mine. It produced lode gold, with lead and silver. On the South fork of Mineral Creek, is the Tacoma lode gold mine.