Idaho City Placer (Goldhill Placer Mines; Gold Hill Placers Nos. 1; 3; 4; 5), Idaho City District, Boise Co., Idaho, USA
|Latitude & Longitude (WGS84):||43° 50' 12'' North , 115° 49' 6'' West|
|Latitude & Longitude (decimal):||43.836666107177734, -115.8183364868164|
REF:Deposit:: METZGER, O. H. 1938, RECONNAISSANCE OF PLACER MINING IN BOISE COUNTY, IDAHO, U. S. BUREAU OF MINES INF. CIRC. 7028 P. 26
Deposit:: 1938 RECON USBM INF. CIRC. 702
Production:: METZGER, O. H., 1938, U. S. BUREAU OF MINES INF. CIRC. 7028, P. 28.
Deposit:: HAILEY QUAD, MINES AND PROSPECTS MAP SERIES, 1981, NO. 333
Deposit:: V.E. MITCHELL, ET. AL.
Deposit:: METZGER, 1938, USBM IC-7028 P26
Commodities (Major) - Gold
Development Status: Past Producer
Host Rock Unit: Missoula
Host Rock: Gravel
Rock Types Recorded
Select Rock List TypeAlphabetical List Tree Diagram
Entries shown in red are rocks recorded for this region.
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
|Tortonian - Burdigalian|
7.246 - 20.44 Ma
|Sedimentary rocks associated with flood basalts|
Age: Miocene (7.246 - 20.44 Ma)
Stratigraphic Name: Columbia River Basalt Group
Description: Fluvial and lacustrine deposits associated with Columbia River Basalt Group and equivalent basalts (17-8 Ma); consolidated to weakly consolidated sandstone, siltstone, arkose, conglomerate, claystone, and tuffaceous sediment; subordinate intercalated basalt and rhyolitic tuff. Includes Payette and Sucker Creek formations in southwestern Idaho, sediments associated with basalt of Weiser in western Idaho, and Latah Formation in northern Idaho. Includes sedimentary rocks of uncertain origin in southwest corner of Idaho. (Quaternary to Eocene Continental Sediments and Sedimentary Rocks).
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. 
66 - 145 Ma
|Idaho batholith, biotite granodiorite|
Age: Cretaceous (66 - 145 Ma)
Reference: Zientek, M.L., P.D. Derkey, R.J. Miller, J.D. Causet et al. Spatial Databases for the Geology of the Northern Rocky Mountains - Idaho, Montana, and Washington. U.S. Geological Survey Open-File Report 2005-1235 Version 1.0.