Mason Valley Mine

Mason Valley Mine is a past producer of copper, gold, silver, gypsum-anhydrite in Lyon County, Nevada, in USGS's large output class. USGS records production from 1870. It is one of 93 historic gold producers USGS lists in Lyon County, and number 2 when they are sorted by output class.

Facts

USGS status
Past producer
Output class
large (USGS class)
Commodities
Copper, Gold, Silver, Gypsum-Anhydrite, Iron
Deposit type
Skarn Cu
Workings
Underground
Production years
from 1870
Discovered
1865
County
Lyon County
State
Nevada
Land status (BLM data)
Private land or land not mapped as public
USGS record
10103617

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Land status comes from the BLM Surface Management Agency dataset and can be out of date.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.

Gold sites nearby

28 other USGS gold sites within 12 miles. The Lyon County page lists the biggest.