Property scale exploration targeting with WorldView-3

cuprite_wv3_alunite_with_scalebar

PhotoSat offers a geological alteration mapping package produced using WorldView-3 high resolution satellite photos, with about 64 times the resolution of ASTER alteration mapping. In areas of sparse vegetation, 16 band WorldView-3 photos are used to map opal/chalcedony, kaolinite, jarosite, sericite, chlorite, calcite and many other minerals for epithermal gold and silver and porphyry copper exploration.

WorldView-3 ALTERATION mineral mapping

Depending on the presence of the alteration minerals on photo visible outcrops and subcrops the PhotoSat WorldView-3 alteration mineral mapping will include the minerals listed below.  If the mineral is not present it will not be included in the maps and report.

All Silica    SiO2

Opal/Chalcedony    SiO2•n(H2O)

Calcite             CaCO3

Chlorite/Epidote PhotoSat cannot differentiate between chlorite and epidote minerals with 16 band WorldView-3 photos.

Clay minerals

Alunite                    (Na,K)Al3(SO4)2(OH)6

Kaolinite                  Al2Si2O5(OH)4

Montmorillonite     (Na,Ca)0.33(Al,Mg)2(Si4O10)(OH)2 · nH2O

Micas

Sericite: Sericite is hydrothermal alteration of orthoclase or plagioclase feldspars.  It may consist of each or a combination of the mica minerals Muscovite, Illite, and Paragonite.

PhotoSat cannot differentiate between these micas with 16 band WorldView-3 photos.

                 Muscovite   (KF)2(Al2O3)3(SiO2)6(H2O)

                 Paragonite  NaAl2[(OH)2|AlSi3O10]

                 Illite          K0.6(H3O)0.4Al1.3Mg0.3Fe2+0.1Si3.5O10(OH)2·(H2O)

Ammonium Minerals

Ammonium Illite    very good match to NH4 Illite spectra

Buddingtonite (ammonium feldspar)  NH4AlSi3O8

Iron Oxides

Hematite            Fe3+2O3

Goethite             Fe3+O(OH)

Jarosite              KFe3+3(SO4)2(OH)6

Iron Oxide Gossans    FeO

Context images

2 m Geology enhanced colour image

2 m Vegetation intensity

50 cm Greyscale image

50 cm Natural colour image

Deliverables:  All alteration minerals as RGB Geotiff files blue=possible, red=probable.

Shapefile polygons of probable areas for all alteration minerals

WV3 alteration mapping report

ADVANCED PRODUCTS:

Spectral matching: Spectral matching uses the spectral signature of a pixel to look for other similar pixels. If there is an outcrop of significant interest, we can analyze the spectral signature of a pixel related to that outcrop and search for other pixels in the WorldView-3 scene that are similar.

WorldView-3 alteration package pricing

The geological alteration mapping is provided on a project-by-project basis and priced by the square kilometer. Please provide us with the extents of your project area and we will prepare a quote.

For more information contact us at info@photosat.ca or 1-604-681-9770.

PhotoSat WorldView-3 Alteration Deliverables

Up to 13 orthorectified mineral images:

  • Opal/Chalcedony
  • Calcite
  • Chlorite/Epidote
  • Alunite
  • Kaolinite
  • Montmorillonite
  • Sericite
  • Buddingtonite
  • Ammonium Illite
  • Hematite
  • Goethite
  • Jarosite
  • Iron Oxide Gossans

4 Context images:

  • 2 m Geology enhanced colour image
  • 2 m Vegetation intensity
  • 50 cm Greyscale image
  • 50 cm Natural colour image

Up to 13 ESRI Shapefiles (polygon)

  • Opal/Chalcedony
  • Calcite
  • Chlorite/Epidote
  • Alunite
  • Kaolinite
  • Montmorillonite
  • Sericite
  • Buddingtonite
  • Ammonium Illite
  • Hematite
  • Goethite
  • Jarosite
  • Iron Oxide Gossans

PhotoSat WorldView-3 Alteration Technical Specifications

Scene Dimensions: Minimum 50 km2
Map Projection: UTM, Others on request
Datum: WGS84, NAD27, NAD83 – Others on request
Raster Format: Alteration and Colour Images: GeoTIFF
Vector Format: Alteration minerals: ESRI Shapefiles (polygon)
Pixel Size: Colour=50 cm, alteration 2 m resampled from 7.5 m
Media: FTP
Image Resolution Pixel Size
Greyscale image

Natural colour image

50 cm 50 cm
Geology enhanced colour image

Iron oxide gossans

Vegetation intensity

2 m 2 m
Opal/Chalcedony

Calcite

Chlorite/Epidote

Alunite

Kaolinite

Montmorillonite

Sericite

Buddingtonite

Ammonium Illite

Hematite

Goethite

Jarosite

3.7 m 2 m

License Agreement

  • DigitalGlobe Internal Use License
  • PhotoSat General Terms of Sale