Near infrared (NIR) spectroscopy is a widely used exploration tool as it provides a simple means of rapidly identifying mineral zonation and information for vectoring at the regional and deposit scale.

Recognised as the de facto NIR spectrometer technology, the portable TerraSpec 4 ASD is a user-friendly and rapid system for characterising hundreds of mineralogical samples per day providing the real-time information necessary to optimise the exploration process. The system can analyse outcrops, hand specimens, diamond core, RC drill chips, and — all with little or no sample preparation.

The TerraSpec 4 ASD is well suited for the identification and characterisation of many mineral species including Fe-oxides, white micas, kandites, smectites, alunite, sulfates, pyrophyllite, diaspore, topaz, zunyite, carbonates, chlorite, epidote, amphiboles, biotite, and tourmaline among other minerals.

The TerraSpec 4 ASD will map and characterise alteration zones associated with many ore deposit styles (e.g., regolith, orgoenic gold, VHMS, epithermal and porphyry deposits). Since many of the minerals are stable over limited temperature and pH ranges, their distribution and variable spectral features (e.g., composition, crystallinity) allow for reconstruction of the thermal, geochemical and weathering environment which will assist in recognising and vectoring toward mineral deposits.

The Al-OH absorption feature shifts to higher wavelengths towards Au mineralisation at the Tropicana gold deposit (Modified from Doyle, 2007).

  • Product Specifications
    Wavelength350-2500 nm
    Resolution3 nm @ 700 nm and 6 nm @ 1400/2100 nm
    Scanning Time100 milliseconds
    Signal-to-noise RatioVNIR: 9,000:1 @ 700nm
    SWIR 1: 9,000:1 @ 1400 nm
    SWIR 2: 4,000:1 @ 2100 nm
    Stray LightVNIR: 5,000:1 (0.02%)
    NIR: 10,000:1 (0.01%)
    Wavelength Reproducibility0.1 nm
    Wavelength Accuracy0.5 nm
    VNIR Detector(350-1000 nm) 512 element silicon array
    SWIR 1 & 2 Detectors(1001-1800 nm) & (1801-2500 nm) Graded Index InGaAs Photodiode, TE Cooled
    CommunicationsWired: 10/100 Base T Ethernet port with Ethernet cross-over cable
    Wireless: 802.11g/n wireless card
    DimensionsH12.7 x W36.8 x D29.2cm
    Battery Weight1.2kg
    Battery Run TimeApproximately 6 hours (without lamps or accessories)
    Operating Temperature0 to 40 degrees C
    Storage Temperature-15 to 45 degrees C
    Input PowerAC/DC switching power supply and a sealed lead-acid gel cell battery
    AC Input90-240 VAC, 50/60 Hz
    DC Input12 VDC, 60 W
    Auxiliary Port PowerOutput, +12 VDC, 27 W (max)
    SoftwareRS3™ spectral acquisition software, Compatibility with The Spectral Geologist and SpecMin, Seamless interface with ENVI®, ASD ViewSpec™ Pro for post processing, optional Indico® Pro
    PortabilityRugged instrument transportation case; optional customised backpack with soft-sided travel bag

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