PIERINA GOLD-SILVER DEPOSIT


Pierina is a high sulphidation (acid sulphate) epithermal gold-silver deposit in a host of Tertiary pyroclastics.The open pit, valley-fill, heap leach operation is located at long. 77º35'W, lat. 9º26'S in the Cordillera Negra of north-central Peru. The main ore host is a core zone of residual vuggy silica with alunite, it is surrounded by a zone of alunite with minor pyrophyllite and dickite, and finally an outer zone of kaolinitic to illitic clay. At year-end 2002, proven and probable reserves at Pierina stood at 3.6 Moz of gold. Since production began in November 1998, the mine has produced over 3.5 Moz of gold at an average cash cost of US$51/oz.

Location: Pierina. Andean Cordillera, Peru
Annotation: Early vuggy silica; standard ore carrying 1-2 g/t gold
Source: Peter Laznicka
Date: July 2000
File size: 68.97 Kb
Location: Pierina. Andean Cordillera, Peru
Annotation: Steam-overprinted vuggy silica: gold enriched
Source: Peter Laznicka
Date: July 2000
File size: 85.80 Kb
Location: Pierina. Andean Cordillera, Peru
Annotation: Detail of steam-overprinted vuggy silica: gold enriched
Source: Peter Laznicka
Date: July 2000
File size: 98.59 Kb
Location: Pierina. Andean Cordillera, Peru
Annotation: Barite in vuggy silica; late stage
Source: Peter Laznicka
Date: July 2000
File size: 69.68 Kb
Location: Pierina. Andean Cordillera, Peru
Annotation: Barite in vuggy silica; late stage
Source: Peter Laznicka
Date: July 2000
File size: 37.27 Kb
Location: Pierina. Andean Cordillera, Peru
Annotation: Vuggy silica with unoxidised relicts in oxidised 2-5 g/t gold
Source: Peter Laznicka
Date: July 2000
File size: 86.80 Kb
Location: Pierina. Andean Cordillera, Peru
Annotation: Unoxidised older vuggy silica with sulphur eyes and disseminated pyrite
Source: Peter Laznicka
Date: July 2000
File size: 80.85 Kb
Location: Pierina. Andean Cordillera, Peru
Annotation: Vuggy silica: unoxidised core, oxidised rim
Source: Peter Laznicka
Date: July 2000
File size: 65.32 Kb
Location: Pierina. Andean Cordillera, Peru
Annotation: Relicts of unoxidised vuggy silica with sulphur and dispersed pyrite in oxidised rim
Source: Peter Laznicka
Date: July 2000
File size: 74.36 Kb
Location: Pierina. Andean Cordillera, Peru
Annotation: Barren alunite-clay altered volcanics
Source: Peter Laznicka
Date: July 2000
File size: 70.48 Kb
Location: Pierina, Andean Cordillera, Peru
Annotation: PIMA short wavelength infrared reflectance spectrometry: example of stacked profiles and associated measurement locations. A tabulation of interpreted mineralogy for all Pierina measurements may be viewed as a PDF file by clicking the link 'PIMA mineralogy' on the plate portal page.
Source: Data Metallogenica
Date: 2002
File size: 106.76 Kb

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