Bare Hills Copper Mine (Smith Avenue Copper Mine), Bare Hills, Baltimore Co., Maryland, USA
|Latitude & Longitude (WGS84):||39° 22' 39'' North , 76° 39' 54'' West|
|Latitude & Longitude (decimal):||39.3775509072, -76.6649751734|
A copper mine located about 1 mile NW of Mt Washington and about 3 miles NW of Baltimore. Started 1845 and closed 1880. Reopened during the period 1905. Owned by the Bare Hills Mining Co. Host rock is hornblende gneiss. Produced 32,500 tons of 18% Cu. Workings featured a 600 foot shaft, later deepened to 900 feet.
30 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
|Paleozoic - Proterozoic|
252.17 - 2500 Ma
|Baltimore Gabbro Complex|
Age: to Permian (252.17 - 2500 Ma)
Stratigraphic Name: Baltimore Gabbro Complex
Description: Hypersthene gabbro with subordinate amounts of olivine gabbro, norite, anorthositic gabbro, and pyroxenite; igneous minerals and textures well preserved in some rocks, other rocks exhibit varying degrees of alteration and recrystallization with a new metamorphic mineral assemblage.
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. 
Zodac, Peter (1946) Bare Hills Copper Mine: Rocks and Minerals: 21(3): 144-145.
Heyl, A. & Pearre, N (1965) Copper, zinc, lead, iron cobalt and barite deposits of the Piedmont Upland in Maryland: Maryland Geological Survey: Bulletin 28: 60-63.
Moore, H.C. (1994) A brief history of the copper mine at Bare Hills, Maryland: Matrix: 3 (4&5): 93-97.