Almaden Mine

Almaden Mine is a past producer of gold, mercury in Washington County, Idaho, in USGS's medium output class. USGS records production from 1939. It is one of 15 historic gold producers USGS lists in Washington County, and number 1 when they are sorted by output class.

Facts

USGS status
Past producer
Output class
medium (USGS class)
Commodities
Gold, Mercury
Workings
Surface
Production years
from 1939
Discovered
1936
County
Washington County
State
Idaho
Land status (BLM data)
Private land or land not mapped as public
USGS record
10040402

Source: USGS Mineral Resources Data System (retrieved 2026-10-13). The database was last updated around 2011, positions can be approximate, and "producer" does not mean a mine is operating today. "Output class" is a code whose meaning changed over the years, so compare sites inside this data and do not read it as tonnage.

Land status comes from the BLM Surface Management Agency dataset and can be out of date. Check ownership before you go near any mine site.