| Union Hill | |
| Settlement Type: | Former settlement |
| Pushpin Map: | California |
| Pushpin Label Position: | bottom |
| Pushpin Map Caption: | Location in California |
| Unit Pref: | US |
| Subdivision Type: | Country |
| Subdivision Type1: | State |
| Subdivision Type2: | County |
| Subdivision Name2: | Nevada County |
| Timezone: | Pacific (PST) |
| Utc Offset: | -8 |
| Timezone Dst: | PDT |
| Utc Offset Dst: | -7 |
| Coordinates: | 39.2056°N -121.0375°W |
| Elevation M: | 823 |
| Elevation Ft: | 2700 |
Union Hill is a former settlement in Nevada County, California, 1.5miles from Grass Valley.[1] Its elevation is 2700feet above sea level.
Gold mining is recorded as early as January 30, 1851. A number of mines yielded eighty dollars per ton at times. Sulfurets were said to yield 420 dollars per ton. First arrastres were in use, then a number of stamp mills.[2]
The Union Hill School District, established in 1868, continues to operate in Grass Valley, though at a different location.
Beginning in 1876, travelers could reach Union Hill via the Nevada County Narrow Gauge Railroad.[3] Its station was located on the Union Hill road, southeast of Grass Valley and northwest of Colfax.[4]
The Union Hill mine was a good producer of gold for many years.