Geochemical modeling of gold precipitation conditions in the Bloco do Butiá Mine, Lavras do Sul/Brazil

Anais da Academia Brasileira de Ciencias

Volumn 77, Issue 4, 2005, Pages 717-728

  Mexias, André S ^a   Berger, Gilles ^b   Gomes, Márcia E B ^a   Formoso, Milton L L ^a   Dani, Norberto ^a   Frantz, José C ^a   Bongiolo, Everton M ^a  

^a FEDERAL UNIVERSITY OF RIO GRANDE DO SUL   (Brazil)

^b UNIVERSITÉ DE TOULOUSE   (France)

Author keywords

Fluid rock interaction; Geochemical modeling; Gold; Pyrite; Sulfur

Indexed keywords

BUTIA;

EID: 31044441319     PISSN: 00013765     EISSN: 00013765     Source Type: Journal    
DOI: 10.1590/s0001-37652005000400010     Document Type: Article

References (11)

1. BENCHEKROUN F, BERGER G AND MOINE B. 1996. Un modèle minéralogique et chimique du dépôt de l'or dans le gisement de Salsigne (Montagne Noire). CRAS 323: 129-136.
2. GAMMONS CH AND WILLIAMS-JONES AE. 1997. Chemical mobility of gold in the porphyryepithermal environment. Econ Geol 92: 45-59.
3. GASTAL MCP AND LAFON JM. 1998. Gênese e evolução dos granitóides metaluminosos de afinidade alcalina da porção oeste do escudo Sul-riograndense: Geoquímica e isótopos de Rb-Sr e Pb-Pb. Rev Bras de Geocienc 28: 11-28.
4. GIBERT F, PASCAL ML AND PICHAVANT M. 1998. Gold solubility and speciation in hydrothermal solutions: Experimental study of the stability of hydrosulfide complex of gold (AuHS°) at 350 to 450°C and 500 bars. Geochim Cosmochim Acta 62: 2931-2947.
5. 2S bearing aqueous solutions at 250-350°C. Geochim Cosmochim Acta 55: 2111-2126.
6. HELGESON HC, KIRKHAM DH AND FLOWERS GC. 1981. Theoretical prediction of the thermodynamic behavior of aqueous electrolytes at high pressures and temperatures: IV. Calculation of activity coefficients, osmotic coefficients and apparent molal and standard and relative partial molal properties to 600°C and 5 kb. Amer J Sci 281: 1249-1516.
7. MEXIAS AS, GOMES MEB, BONGIOLO E AND FORMOSO MLL. 2002. Perdas e Ganhos Geoquímicos Associados ao Hidrotermalismo da area do Bloco do Butiâ - Lavras do Sul, RS.In: CONGRESSO BRASI-LEIRO DE GEOLOGIA XLI. Anais, João Pessoa, PB, Brasil 1:455.
8. MEXIAS AS, GOMES MEB, BONGIOLO E AND DANI N. 2004. Epi syenite as precursors of gold mineralization in Bloco do Butiâ Mine - Lavras do Sul/Brazil. In: 32nd INTERNATIONAL GEOLOGICAL CONGRESS. Firenze (Italy). Proceedings: CD Rom. Session 8 page 52.
9. SCHENBERGER DM AND BARNES HL. 1989. Solubility of gold in aqueous sulfide solutions from 150 to 350°C. Geochim Cosmochim Acta 53: 269-278.
10. WOLERY TJ. 1983. EQ3NR, a computer program for geochemical aqueous speciation solubility calculations: user's guide and documentation. UCRL-53414, Lawrence Livermore National Laboratory, Livermore, California.
11. WOLERY TJ AND DAVELER SA. 1992. EQ3/6, A Software Package for Geochemical Modeling of Aqueous Systems. UCRL-MA-110662 PTI-IV. Lawrence Livermore National Laboratory, Livermore, California.