The Hiendelaencina mining district (Guadalajara,Spain) |
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Authors: | J Martínez Frías |
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Institution: | (1) Instituto Andaluz de Geología Mediterránea, C.S.I.C., Universidad de Granada, Granada, Spain |
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Abstract: | The Hiendelaencina mining district (Guadalajara, Spain), includes the ore deposits of the Hiendelaencina, La Bodera and Congostrina
areas. In this paper a general overview of this district is given, with special emphasis on the parageneses, mineralizing
stages and chemical characteristics of the sulphides and sulphosalts. These deposits contain silver in Sb-rich sulphosalts
such as freibergite, pyrargyrite, polybasite, stephanite, freieslebenite and the Bi-rich sulphosalt, aramayoite. Three mineralizing
stages have been detected in Hiendelaencina and Congostrina: (1) As-Fe; (2) Cu-Zn-Fe-Sb-Ag; and (3) Pb-Sb-Ag (±Bi) but only
two in La Bodera (stages 2 and 3). The average sulphosalt formulas are: freibergite (Cu0.5 Ag5.9) (Fe1.42 Zn0.66) (Sb4.49 As0.02) S13; pyrargyrite Ag3.38 Sb1.0 S3; polybasite (Ag16.3Cu0.15) (Sb2.8 As0.15) S11; stephanite Ag6.7 Sb1.38 S4; freieslebenite Ag1.1 Sb0.83 Pb1.05 S3 and aramayoite Ag1.06 Bi0. 35 Sb0.7 Pb0.03 S2. The compositional patterns of these sulphosalts (mainly based on the Sb/(Sb + Ag), Ag/ (Ag + Cu), Sb(Ag + As) and Ag/(Ag
+ Cu) ratios) are outlined, pointing broadly to similar tendencies in their chemistry and genetic conditions. |
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