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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' 0'' South , 66° 37' 60'' 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

'Albite-Anorthite Series'
Allophane
Alunite
'Andorite'
Anglesite
Antlerite
Arsenic
Arsenopyrite
Augelite
Azurite
Baryte
'Biotite'
Bismite
Bismoclite
Bismuth
Bismuthinite
Bismutite ?
Bornite
Boulangerite
Bournonite
Brochantite ?
Caledonite
Cassiterite
var: Wood Tin ?
Cervantite
Chalcanthite
Chalcocite
Chalcopyrite
Chalcosiderite
Childrenite
Chlorapatite
Chrysocolla
Cookeite
Copper
Cordierite
Covellite
Crandallite
Creedite
Cronstedtite
Cuprite
Cylindrite
Diadochite
Dravite
Epsomite
Evansite
Faustite
Ferberite
Ferrivauxite (TL)
Florencite-(Ce)
Fluorapatite
Franckeite
var: Potosíite ?
Galena
Goethite
Goyazite
Greenockite
Gypsum
Hagendorfite
Halite ?
Halotrichite
Hematite
Hinsdalite
Hisingerite
'Hornblende'
Hübnerite
Jamesonite
Jarosite
Jeanbandyite (TL)
Kaolinite
Linarite
Malachite
Marcasite
Melanterite
Mélonjosephite
Metavauxite (TL)
Miargyrite ?
'Monazite'
Monazite-(Ce)
Monazite-(La)
Muscovite
var: Sericite
Nacrite
Natanite
Opal
Orpiment
Orthoclase
Paravauxite (TL)
Phosphophyllite
Pickeringite
Plumbogummite
Pyrargyrite
Pyrite
Pyromorphite
Pyrrhotite
Quartz
'Quartz-beta'
Realgar
'Rhabdophane'
Rhodochrosite
Rockbridgeite
Römerite
Rutile
Scheelite
Siderite
Sigloite (TL)
'Silesite'
Silver
Sphalerite
var: Gumucionite
Stannite
Stibnite
Sulphur
Tenorite
Tetradymite ?
Tetrahedrite
Thorite ?
'Tourmaline'
Troilite
Tungstite
Variscite
Vauxite (TL)
Vivianite
Wavellite
Wickmanite
Wurtzite
Xenotime-(Y)
Zinkenite ?
Zircon


128 entries listed. 111 valid minerals. 6 (TL) - type locality of valid minerals. 4 erroneous literature entries.

The above list contains all mineral locality references listed on mindat.org. 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 mindat.org 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.

References

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

Samoyloff, V. (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.

Raade, G., Grice, J.D., Rowe, R. (2016): Ferrivauxite, a new phosphate mineral from Llallagua, Bolivia. Mineralogical Magazine, 80, 311-324

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