The Owyhee Mountains are a mountain range in

Owyhee County, Idaho Owyhee County ( ) is a county in the southwestern corner of the U.S. state of Idaho. As of the 2020 census, the population was 12,133. The county seat is Murphy, and its largest city is Homedale. In area it is the second-largest county in Idah ...

and

Malheur County, Oregon Malheur County () is one of the 36 counties in the U.S. state of Oregon. As of the 2020 census, the population was 31,571. Its county seat is Vale, and its largest city is Ontario. The county was named after the Malheur River, which runs t ...

. Mahogany Mountain and the associated

volcanic crater A volcanic crater is an approximately circular depression in the ground caused by volcanic activity. It is typically a bowl-shaped feature containing one or more vents. During volcanic eruptions, molten magma and volcanic gases rise from an und ...

s of the Lake Owyhee volcanic field are in the Owyhee Mountains of Oregon just east of the Owyhee Reservoir on the

Owyhee River The Owyhee River is a tributary of the Snake River located in northern Nevada, southwestern Idaho and southeastern Oregon in the United States. It is long.Owyhee Rive accessed November 3, 2019 The river's drainage basin is in area, one of the l ...

. The southeastern end of the range including the old mining area west of Silver City is referred to as the Silver City Range.''Murphy, Idaho,'' 30x60 Minute Topographic Quadrangle, USGS, 1986 About west of Silver City is the De Lamar ghost town in Jordan Creek below the mine workings on De Lamar Mountain to the south. The area was active in the late 1880s. In the 1970s mining began again with the development of open pit

silver Silver is a chemical element with the symbol Ag (from the Latin ', derived from the Proto-Indo-European ''h₂erǵ'': "shiny" or "white") and atomic number 47. A soft, white, lustrous transition metal, it exhibits the highest electrical ...

–

gold Gold is a chemical element with the symbol Au (from la, aurum) and atomic number 79. This makes it one of the higher atomic number elements that occur naturally. It is a bright, slightly orange-yellow, dense, soft, malleable, and ductile ...

mines on De Lamar Mountain.''De Lamar, Idaho,'' 7.5 Minute Topographic Quadrangle, USGS, 1990

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Further reading