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TAG mound, Trans-Atlantic Geotraverse hydrothermal field (TAG), Mid-Atlantic Ridge complex, Atlantic Ocean

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Latitude & Longitude (WGS84): 26° 8' 23'' North , 44° 49' 55'' West
Latitude & Longitude (decimal): 26.13972,-44.83194

The TAG mound, about 3,650 meters below sea level, is approximately 200m in diameter and up to 50m high. It is located on the east margin of the Mid-Atlantic ridge axial valley.

Mineral List

28 valid minerals.

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This page contains all mineral locality references listed on This does not claim to be a complete list. If you know of more minerals from this site, please register so you can add to our database. This locality information is for reference purposes only. You should never attempt to visit any sites listed in without first ensuring that you have the permission of the land and/or mineral rights holders for access and that you are aware of all safety precautions necessary.


Thompson, G., S. E. Humphris, B. Schroeder, M. Sulanowska, & P. A. Rona (1988), Active vents and massive sulfides at 26 degrees N (TAG) and 23 degrees N (Snakepit) on the Mid-Atlantic Ridge: Canadian Mineralogist: 26: 697-711

Mozgova, N.N., Borodaev, Y.S., Stepanova, T.V., Cherkashev, G.A., and Zhirnov, E.A. (2000): Noble Metals in Sulfide Assemblages from Deep Sectors of the Active TAG Mound (Mid-Atlantic Ridge, 26°08' N). Lithology and Mineral Resources 35(1), 1-18.

Petersen, S., Herzig, P.M., and Hannington, M.D. (2000): Third dimension of a presently forming VMS deposit: TAG hydrothermal mound, Mid-Atlantic Ridge, 26°N. Mineralium Deposita 35, 233-259.

Shaoyong Jiang, Tao Yang, Liang Li, Kuidong Zhao, and Hongfei Ling (2006): Lead and sulfur isotopic compositions of sulfides from the TAG hydrothermal field, Mid-Atlantic ridge. Acta Petrologica Sinica 22(10), 2597-2602.

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