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Mahogany Mountain
Mahogany Mountain is an ancient caldera volcano on the border of Oregon and Idaho, in Malheur County and Owyhee County, respectively. While its early history is largely unknown, its last eruption was probably 15.5 million years ago. This eruption ejected layers of rhyolite and produced tuff, creating formations of rock in the Leslie Gulch. Nearby features include the Owyhee River, historically used as a fishing and camping ground for early Native Americans. The climate of the area tends to be extreme; that is, it is cold in the winter and hot in summer. Sparse vegetation is present, including shrubs and patches of juniper. Geography and geology A part of the Basin and Range Province, the volcano's most recent eruptive activity dates to approximately 15 million years ago (the Miocene), forming during a period of active volcanism including eruptions of ignimbrite and volcanic ash, ash. It formed around the same time as Three Fingers (Washington), Three Fingers, Castle Peak (Wash ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Owyhee Mountains
The Owyhee Mountains are a mountain range in Owyhee County, Idaho and Malheur County, Oregon. Mahogany Mountain and the associated volcanic craters of the Lake Owyhee volcanic field are in the Owyhee Mountains of Oregon just east of the Owyhee Reservoir on the Owyhee River. 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–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 met ... mines on De Lamar Mounta ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
