Sourdough No. 1 and No. 2.

Sourdough No. 1 and No. 2. is a producer of silver, gold in Boise County, Idaho, in USGS's large output class. It is one of 183 historic gold producers USGS lists in Boise County, and number 6 when they are sorted by output class.

Facts

USGS status
Producer
Output class
large (USGS class)
Commodities
Silver, Gold
County
Boise County
State
Idaho
Land status (BLM data)
Federal land in a US Forest Service national forest or grassland
USGS record
10108912

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.

This location is mapped as federal land. Public land is not an invitation to enter old workings. Ask the managing agency about access, claims and closures.