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La Helvecia mine, Guandacol, Coronel Felipe Varela department, La Rioja, Argentina

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A strata-bound Pb-Zn-Ag-baryte deposit located between San Juan and La Rioja.

History:
Discovery year: 1898
Year of first production: 1945.
Year of last production: 1983.
Production years: 35.
Mine the Helvecia, Coronel Florencio Varela Department, Province of La Rioja: Site of type strata-bound. The smithsonite, hemimorphite-associated was exploited for more than 20 years, with a global production in the order of 10,000 tonnes.
Owner: YAMIRI GOLD AND ENERGY - YAMIRI S. A. - Yacimientos Mineros Riojanos S. A.: The property is composed of 13,787 has located in the South of La Rioja, Argentina. The property has been explored and exploited since the year 1800. CNEA estimated resources containing 1.35 M ounces of U3O8 in Urcushcun and Urcal in the 1970s. Until March 2008, work is continued to define the amount of uranium and molybdenum while guests study the regional characteristics and deposits of gold in sedimentary rocks.
Association: hemimorphite, aurichalcite, hydrozincite, cerussite, malachite, azurite and anglesite, among others.

Characteritics:
Alteration Processes:Dissolution and filling of karstic cavities, contact metamorphism.
Concentration Processes: Remobilization of sedimentary mineralization.
Ore controls: Ordovicic-carboniferous unconformity, fracturing and folding posordovicic, karstification.
Host rock unit name: San Juan formation; Volcán Formation; Panacan formation.
Host rock type: Conglomerate, limestone.
Associated rock type: Diorite, andesite.
Structural characteristics: Reverse low-angle faulting, towards N-S, 25° tilt, subvertical E-W fault.
Ore body form: Tabular, strataform, irregular.

Mineral List



13 entries listed. 12 valid minerals.

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

Milka K. de Brodtkorb and Alejo Brodtkorb (1978) Proceedings of the 5th Quadrennial IAGOD Symposium (Snowbird, Utah, 1978), p. 785.

A. Brodtkorb (1979). La Helvecia: un depósito estratoligado de Pb-Zn y baritina, provincia de La Rioja. Revista de la Asociación Geológica Argentina, 34(4):311-330.

A. Brodtkorb y M. K. de Brodtkorb (1999). Distrito La Helvecia (Plomo, cinc y bario), La Rioja. En: Recursos Minerales de la República Argentina (Ed. E.O. Zappettini), Instituto de Geología y Recursos Minerales SEGEMAR, Anales 35:691-696.

N. Pezzutti y M. K. de Brodtkorb (1975). La asociación auricalcita, smithsonita, hidrozincita y hemimorfita, de la manifestación el Llanito, provincia de La Rioja. 6° Congreso Geológico Argentino, 3:123-132.

 
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