BATU HIJAU COPPER-GOLD DEPOSIT - 2464: SPECTRAL MINERALOGY


This plate samples the Batu Hijau leached cap and supergene alteration zone and is dominated by various mixtures of chrysocolla, malachite, alunite, kaolinite, illite, montmorillonite and goethite. Each specimen has four adjacent spectra, collected from the circled areas on the images shown. Spectral samples number 1-20 from the top left to bottom right of each plate, reading from left to right. In the first gallery, below, the spectral measurement strategy is also shown.


Location: Data Metallogenica Centre, Adelaide, South Australia
Annotation: Spectral Measurement Strategy. A computer-controlled ASD FieldSpec-Pro spectrometer and a robotic x/y table scan each DM plate in ~4 minutes. Four or more spectra, each covering a 8mm field of view, are collected from each specimen. This allows tests of reproducibility, picks up specimen heterogeneity, and permits specimen averaging. The locations of all spectra are recorded and etched into JPEG images of each plate. Spectra cover the 350-2500 nm range in 2048 channels, each integrated for 2 seconds, ensuring high signal-to-noise ratio. Spectra are calibrated to Spectralon™. This spectral range allows analysis of oxide, hydroxyl (e.g. clays and phyllosilicates), sulphate and carbonate-bearing minerals and some sulphides. It does not permit analysis of quartz, feldspars, garnets, olivines or pyroxenes. This requires longer wavelength sensing, not yet available.
Source: Jon Huntington, CSIRO Exploration & Mining
Date: September 2003
File size: 56.42 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Plate 2464, Specimens 1-20, Spectral Overview showing major features and spectral variability
Source: Jon Huntington, CSIRO Exploration & Mining
Date: February 2004
File size: 107.64 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Plate 2464, Specimen 1, Spectral Mineralogy Goethite, Kaolinite, Water
Source: Jon Huntington, CSIRO Exploration & Mining
Date: February 2004
File size: 85.75 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Plate 2464, Specimen 2, Spectral Mineralogy Na-alunite, Goethite, possible K-alunite
Source: Jon Huntington, CSIRO Exploration & Mining
Date: February 2004
File size: 85.76 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Plate 2464, Specimen 3, Spectral Mineralogy Montmorillonite, Chrysocolla, Goethite
Source: Jon Huntington, CSIRO Exploration & Mining
Date: February 2004
File size: 84.85 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Plate 2464, Specimen 4, Spectral Mineralogy Chrysocolla, Illite, Goethite, possible Montmorillonite
Source: Jon Huntington, CSIRO Exploration & Mining
Date: February 2004
File size: 84.44 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Plate 2464, Specimen 5, Spectral Mineralogy Chrysocolla, Montmorillonite
Source: Jon Huntington, CSIRO Exploration & Mining
Date: February 2004
File size: 86.12 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Plate 2464, Specimen 6, Spectral Mineralogy Montmorillonite, Chrysocolla, possible Malachite
Source: Jon Huntington, CSIRO Exploration & Mining
Date: February 2004
File size: 85.92 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Plate 2464, Specimen 7, Spectral Mineralogy Chrysocolla, Malachite
Source: Jon Huntington, CSIRO Exploration & Mining
Date: February 2004
File size: 84.47 Kb
Location: Batu Hijau, Sumbawa, Indonesia
Annotation: Plate 2464, Specimen 8, Spectral Mineralogy Chrysocolla, Illite, possible Malachite
Source: Jon Huntington, CSIRO Exploration & Mining
Date: February 2004
File size: 85.52 Kb
Location:Batu Hijau, Sumbawa, Indonesia
Annotation:Plate 2464, Specimen 9, Spectral Mineralogy Chrysocolla, Montmorillonite
Source:Jon Huntington, CSIRO Exploration & Mining
Date:February 2004
File size:85.92 Kb


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