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Besshi mine (Bessi mine), Besshi, Niihama City, Ehime Prefecture, Shikoku Island, Japan

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Latitude & Longitude (WGS84): 33° 51' 10'' North , 133° 18' 50'' East
Latitude & Longitude (decimal): 33.85278,133.31389
Köppen climate type:Cfa : Humid subtropical climate
Name(s) in local language(s):別子銅山, 愛媛県 新居浜市

A copper and cobalt mine; also produced pyrite for sulphuric acid production, and minor iron, silver and gold. Massive bedded compact sulfide orebody of the "Kieslager" type. Located 12 miles SE of Niihama on the Sambagawa metamorphic belt. Opened before 1902. Produced 10,425,800 pounds Cu (1902). 1958 production: 572,561 tons of ore, averaging 1.3% Cu; 7,396 t Cu, 1,710 t Fe, 62,026 t S, 3,618 Kg Ag, 15.9 Kg Au. Copper values were already declining then, and the mine is now closed. Total production up to 1960 were about 19 million tons ore averaging 3.8% Cu.

Mineral List

Mineral list contains entries from the region specified including sub-localities

34 valid minerals.

Regional Geology

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

Permian - Carboniferous
252.17 - 358.9 Ma

ID: 1376512
Carboniferous-Permian sedimentary rocks

Age: Paleozoic (252.17 - 358.9 Ma)

Lithology: Sedimentary rocks

Reference: Geological Survey of Canada. Generalized geological map of the world and linked databases. doi:10.4095/195142. Open File 2915d. [18]

Data and map coding provided by, used under Creative Commons Attribution 4.0 License

Localities in this Region

  • Shikoku Island
    • Ehime Prefecture
      • Niihama City

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.


Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
加瀬克雄. (1977). Sulfide minerals and their assemblages of the Besshi deposit. Studies on sulfide minerals in metamorphosed ores of the Besshi and Hitachi copper deposits. 1. 鉱山地質, 27(146), 355-365.
Schoeman, P. (1996). Overview and comparison of Besshi-type deposits: ancient and recent (Doctoral dissertation, Rhodes University).
Ko, Z. W., Enami, M., & Aoya, M. (2005). Chloritoid and barroisite-bearing pelitic schists from the eclogite unit in the Besshi district, Sanbagawa metamorphic belt. Lithos, 81(1), 79-100.
Kamitani, M., Okumura, K., Teraoka, Y., Miyano, S., and Watanabe, Y. (2007): Mineral Resources Map of East Asia. Geological Survey of Japan
Rocks & Minerals: 21:568-569; 22:223.

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