|Latitude & Longitude (WGS84):||38° 16' 5'' North , 106° 7' 41'' West|
|Latitude & Longitude (decimal):||38.26826,-106.12832|
|Köppen climate type:||Dfc : Subarctic climate|
The Bonanza mining district is located on the extreme eastern end of the San Juan Mts, south of Poncha Pass & the town of Salida in central Colorado. It was an old silver mining district of modest productivity. The Eagle mine (no connection to the more-famous Eagle mine at Gilman in Eagle Co.) was the largest and best-known mine in the Bonanza district. Rocks & Minerals 75:312
16 valid minerals.
This geological map and associated information on rock units at or nearby to the coordinates given for this locality is based on relatively small scale geological maps provided by various national Geological Surveys. This does not necessarily represent the complete geology at this locality but it gives a background for the region in which it is found.
Click on geological units on the map for more information. Click here to view full-screen map on Macrostrat.org
|Miocene - Eocene|
5.333 - 56 Ma
|Cenozoic volcanic rocks|
Age: Cenozoic (5.333 - 56 Ma)
Stratigraphic Name: San Juan Mountains
Comments: Southern Rocky Mountains
Lithology: Intermediate-felsic volcanic rocks
Reference: Chorlton, L.B. Generalized geology of the world: bedrock domains and major faults in GIS format: a small-scale world geology map with an extended geological attribute database. doi: 10.4095/223767. Geological Survey of Canada, Open File 5529. 
|Rupelian - Priabonian|
28.1 - 37.8 Ma
|Pre-ash-flow andesitic lavas, breccias, tuffs, and conglomerates|
Age: Paleogene (28.1 - 37.8 Ma)
Description: Includes several named units
Reference: Horton, J.D., C.A. San Juan, and D.B. Stoeser. The State Geologic Map Compilation (SGMC) geodatabase of the conterminous United States. doi: 10.3133/ds1052. U.S. Geological Survey Data Series 1052.