Alteration Zone Mapping

Spectroscopy provides an invaluable tool for geologists to track mineral assemblage and composition. As they explore a new region, an oreXpress spectrometer with EZ-ID can help them to detect alteration minerals and chemical/chrystalline variations that are not immediately noticeable. The oreXpress is a rugged and reliable field geological spectrometer for mining exploration.

With an oreXpress and EZ-ID, the user can identify:

  • Micas – muscovite-paragonite, biotite, phlogopite
  • Chlorites – variations in iron-magnesium chlorite
  • Amphiboles – tremolite, hornblende, actinolite
  • Sulfates – jarosite, gypsum
  • Tourmaline – Fe-tourmaline, tourmaline
  • Clays – illite, illite-smectite, kaolinite, dickite
  • Carbonates – calcite, dolomite, ankerite, siderite

Every oreXpress includes our DARWin SP Data Acquisition software and is available with EZ-ID and the Custom Library Builder Module. EZ-ID allows you to compare your target sample with a known library of mineral spectra. EZ-ID comes with the USGS spectral library and is available with the SpecMIN library from Spectral International. The USGS library contains 466 spectra for 226 minerals, while SpecMIN has 1528 spectra for 500 minerals. With both libraries, a geologist has access to a wide range of possible matches for exploration projects in gold, silver, nickel, copper, uranium, and rare earths.

EZ-ID features:

  • Fast and accurate identification of an unknown mineral to a known spectral library sample
  • Ease-of-use: take your scan using an oreXpress or oreXpress platinum and see results in real-time
  • Simple, consistent user interface
  • USGS and SpecMIN libraries available
  • Weighted score for best matches
  • Include or exclude spectral regions of interest for optimal results

Using an oreXpress with EZ-ID delivers the following benefits for exploration geologists:

  • Quickly take a lot of samples
  • Cover more ground in less time
  • More accurate data provides a more complete picture of what you are looking at
  • Less time and expense than waiting for samples to come back from the lab
  • Less drilling – better results – quickly delivers a return-on- investment

In the field the oreXpress is rugged, reliable, and designed for single user operation. Field collection of spectra is fast and accurate. In the core shack, a single geologist with a contact probe could log as much as 400 meters a day. And, since DARWin saves it all in an ASCII format, it’s easy to use the data with 3rd party software for mine mapping, minerals mapping and 3D imagery.

SPECTRAL EVOLUTION’S EZ-ID software has identified our target sample as kaolinite using the USGS spectral library for reference. The shaded areas shown in the scan allow a geologist to concentrate on regions in the spectra of particular interest.