Table 6. Spectral and spatial requirements for the metamorphic-hosted gold deposits (veins and exhalites). 
  
CHARACTERISTIC 
DESCRIPTION 
  
Primary Alteration** 
Secondary Alterat. 
Host Rocks 
Zoning*** 
Structure 
Vegetation 
* 
*k 
Narrow quartz veins, sericite 
(albite), chlorite, carbonate, 
propylitic (broad envelop.) 
Hematite, goethite (restricted 
aerially) 
Metavolcanics, metaseds, 
greenstone, iron format. 
(similar to alterat.minerals) 
Quartz or carbonates, 
chlorite, sericite, (albite) 
propylitic 
High angle normal faults, 
fold axes, basins 
Decrease directly over 
mineralization 
SPECTRAL RANGE (um) SPATIAL RESOL.(m) 
Multispec.  Hyperspec.* Recon Deposit Scale 
2.15-2.35 97.32.33; 20-30 4-6 
2.212236 
0.6-0.7 0.85, 0.95 20-30 4-6 
0.8-1.0 
VNIR, TIR 2.36, 0.85 20-30 10-20 
SWIR 
SWIR, TIR 97286, 5-20 4-6 
2.33,2.2 
SWIR,TIR Spect. feat. 20-80 4-8 
VNIR, above 
Microwave 
NIR 0.7-0.8 10-20 4-6 
Position of some key absorption maxima or emission minima 
Alteration is weak, obscure and narrowly confined, if vein controlled. Primary and secondary mineralogy 
may be indestinguishable. Detection may depend on presence of iron oxides or hyperspectal resolution. 
** Veins: quartz/carbonate-sericite-chlorite and propylitic. Exhalite: oxide-carbonate-silicate facies. 
  
  
Table 7. Spectral and spatial requirements for detachment-related gold deposits. 
  
  
CHARACTERISTIC DESCRIPTION SPECTRAL RANGE (um) SPATIAL RESOL.(m) 
Multispec. Hyperspec.* Recon . Deposit Scale 
Primary Alteration** — Narrow and weak silicif , 9.5-10.5 97.2.33. 10-30 4-8 
chlorite,calcite, specular. 2.15-2.35 
sericite (curvilinear vein), 
broad K-spar. 
Secondary Alterat. Narrow and weak hematite, 0.6-0.7, 0.85, 0.95 10-30 4-8 
goethite 0.8-1.0 
Host Rocks Gneisses, mylonite VNIR,TIR 2.36, 0.85 20-30 10-20 
SWIR TIR 
Zoning*** Silica, calcite, sericite- 9.5-10.5 9.7, 2.33, TIR 5-10 4-8 
chlorite, regional K-spar SWIR 2.22, 2.36 
Structure Low angle faults, steep SWIR ,TIR Spect. feat. 20-80 4-8 
normal fault intersections Microwave above 
VNIR 
Vegetation Subtle variations directly NIR 0.7-0.8 10-20 4-8 
over mineralization 
* Position of some key absorption maxima or emission minima. 
** Very subtle and restricted. 
*** Narrowly confined at vein structure, but broad to regional K-spar . 
  
644 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996 
  
res