Atlantic Mine, Atlantic Mine, Houghton Co., Michigan, USA
|Latitude & Longitude (WGS84):||47° 5' 59'' North , 88° 37' 39'' West|
|Latitude & Longitude (decimal):||47.09972,-88.62750|
|Other regions containing this locality:||Keweenaw Peninsula, Michigan, USA|
|Köppen climate type:||Dfb : Warm-summer humid continental climate|
An underground copper mine consisting of six shafts near the community of Atlantic Mine, south of Houghton. Following the failure of the South Pewaubic and Adams Mining Co's., in 1872 the Atlantic Mining Co. was organized. In this takeover, Atlantic recieved three shafts from Pewaubic, one shaft from Adams, a surface palnt, and several other mining items. The mine worked the Atlantic Amygdaloid Lode through six shafts that were lettered A through F, with the deepest shaft reaching approx. 3,000 ft. on the incline. Operations were steady until 1904 when cave-ins became a problem, causing dangerous "air blasts" underground and small ground tremors on the surface. By 1905, the shafts had "drawn-in" so much that skips could not operate without scraping the hanging wall a short distance in. When the subsidence finally ended in 1906, the shafts were so narrow that the mine was abandoned. It is estimated that approx. 6 million tons of ore remain in the mine. The Atlantic Mine produced approx. 121 million lbs. of refined copper. Very little of the piles remain from mining operations.
6 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
1000 - 1200 Ma
|Portage Lake Volcanics|
Age: Stenian (1000 - 1200 Ma)
Stratigraphic Name: Portage Lake Volcanics
Comments: This unit is the same as unit Yp on paper map of Sims (1992). Description is taken from that unit description.
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. 
1000 - 1600 Ma
|Mesoproterozoic volcanic rocks|
Age: Mesoproterozoic (1000 - 1600 Ma)
Comments: Mid-Continent Rift
Lithology: Bimodal 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.