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Siglo Veinte Mine (Siglo XX Mine; Llallagua Mine; Catavi), Llallagua, Rafael Bustillo Province (Bustillos Province), Potosí Department, Bolivia

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Latitude & Longitude (WGS84): 18° 25' South , 66° 38' West
Latitude & Longitude (decimal): -18.4166666667, -66.6333333333
The name "Siglo Veinte", often also written "Siglo XX", means "Twentieth Century" and was given because serious mining of the tin ores began at the beginning of the century in 1901.
The mine is easily reached from Llallagua, a few minutes walk southwest from the city center.

Mineral List

127 entries listed. 110 valid minerals. 6 (TL) - type locality of valid minerals. 4 erroneous literature entries.

The above list 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.


- American Mineralogist (1922): 7: 107-108.

- Victor Samoyloff (1934): The Llallagua-Uncia tin deposit [Bolivia]
Economic Geology 29:481-499

- Gordon, S.G. (1939): Thorium-free monazite from Llallagua, Bolivia. Academy of Natural Science, Philadelphia. 96: 279-359

- Gordon, S.G. (1939):Greenockite from Llallagua, Bolivia, Notulae Naturae of Academy of Natural Science, Philadelphia No 1, 5 pages

- Samuel G. Gordon (1944): The Mineralogy of the Tin Mines of Cerro de Llallagua, Bolivia. Proceedings of the Academy of Natural Sciences of Philadelphia. Vol. 96, pp. 279-359

- Palache, C., Berman, H., & Frondel, C. (1951), The System of Mineralogy of James Dwight Dana and Edward Salisbury Dana, Yale University 1837-1892, Volume II: 938, 963, 972, 973, 975.

- F. G. Smith, S. K. DasGupta and V. G. Hill (1957): Manganoan ferroan wurtzite from Llallagua, Bolivia (I). Canadian Mineralogist, v. 6 no. 1 p. 128-135

- Hurlbut C S, Honea R (1962) Sigloite, a new mineral from Llallagua, Bolivia, American Mineralogist, 47, 1-8

- Kampf, A. R. (1982): Jeanbandyite a new member of the stottite group from Llallagua, Bolivia. Mineralogical Record 13 (4), 235-239.

- Mining Annual Review (1985): 337.

- K. A. Rodgers, H. W. Kobe, C. W. Childs (1993): Characterization of vivianite from Catavi, Llallagua Bolivia, Mineralogy and Petrology Volume 47, Issue 2, pp 193-208

- Petrov, A. & Sith B & C. (2001): A guide to Mineral Localities in Bolivia. Mineralogical Record. 32, 457-482 (p. 474).

- Hyrsl, J. & A. Petrov (2006): Famous Mineral Localities: Llallagua, Bolivia. Mineralogical Record 37, 117-162.

- Rakovan, J., and Reeder, R.J. (1994) Differential incorporation of trace elements and dissymmetrization in apatite: The role of surface structure during growth. American Mineralogist, 79, 892-903.

- Rakovan, J., and Reeder, R.J. (1996) Intracrystalline Rare Earth Element distributions in apatite: Surface structural influences on zoning during Growth. Geochim. Cosmochim. Acta, 60, 4435-4445.

- Rakovan, J., McDaniel, D.K., and Reeder R.J. (1997) Use of surface-controlled REE sectoral zoning in apatite from Llallagua, Bolivia, to determine a single-crystal Sm-Nd age. Earth and Planetary Science Letters,146, 329-336.

- Rakovan, J., M. Newville and S. Sutton (2001) Evidence of heterovalent europium in zoned Llallagua apatite using wavelength dispersive. American Mineralogist, 86, 697-700.

- Rakovan, J. (2003) Exceptional Apatites from the Siglo XX mine, Llallagua Bolivia. Tucson Mineralogical Symposium. Mineralogical Record 34, 117-118.

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