Table 9. Spectral and spatial requirements for the porphyry copper deposits.* 
  
  
CHARACTERISTIC DESCRIPTION SPECTRAL RANGE(um) SPATIAL RESOLUT.(m) 
Multispec. Hyperspec.** Recon Deposit Scale 
Primary Alteration*** K-feld, biot, quartz, 2.15-2.35 9.7, 2.19& 
sericite, pyrite, (argillic) 9.5-10.5 2.34, 2.21, 15-30 5-8 
propylitic 2.33 
Secondary Alterat. Jarosite, goethite, hematite 0.6-0.7, 0.9, 0.95, 10-30 5-8 
(argillic, alunite) 0.8-1.0 0.85, (SWIR) 
Intrusive Rocks Quartz diorite, granodiorite VNIR,SWIR 2.33, 9.7, 20-30 10-20 
quartz monzonite 9.5-10.5 TIR 
Other Host Rocks Any pre-intrusive unit, but VNIR, SWIR . 2.33, SWIR 20-30 10-20 
carbonates host skarn TIR 
Zoning Potassic - phyllic(argillic) - 9.5-10.5, 9,7,;23.19, 10-20 5-6 
propylitic SWIR 2.21, 2.38 
Structure Major strike-slip faults, VNSWIR,TIR  Spect. feat. 20-80 10-20 
fault intersections Microwave above 
Vegetation Possible decrease or change NIR 0.7-0.8 10-20 5-8 
over intense alteration 
* Includes deposits with by-product molybdenum and gold. 
** Position of some key absorption maxima and emission minima. 
*'** Alteration zones are broad - >1km wide. Intensity varies from high at phyllic systems to low at other types. 
  
  
Table 10. Spectral and spatial requirements for the porphyry molybdenum deposits. 
  
  
CHARACTERISTIC DESCRIPTION SPECTRAL RANGE(um) SPATIAL RESOLUT.(m) 
Multispec.  Hyperspec.* Recon . Deposit Scale 
Primary Alteration** K-spar, biotite, quartz, 2.15-2.35, 9.7, 2.19& 
sericite, pyrite, (argillic) 9.5-10.5 2.34,2.21, 15-30 5-8 
propylitic 2:33 
Secondary Alterat. Jarosite, goethite, (argillic) 0.6-0.7, 9.0, 9.5 10-30 5-8 
0.8-1.0 (SWIR) 
Intrusive Rocks Granodiorite, qtz. monzonite, — VNIR,SWIR 2.3307 20-30 10-20 
granite, rhyolite porphyry 9.5-10.5 TIR 
Other Host Rocks Any pre-intrusive unit, but VNIR, SWIR, SWIR, TIR 
felsic volcanics predominate = TIR 
Zoning *** Potassic - phyllic(argillic) or 9.5-10.5, 9.72.19, 10-20 4-6 
quartz stockwork, propylitic — SWIR 221,233 
Structure Major normal faults, fault VNSWIR, TIR  Spect. feat. 20-80 10-20 
| intersect., concentric faults Microwave listed above 
Vegetation Possible decrease or change NIR 0.7-0.8 10-20 5-8 
over intense alteration 
* Position of some key absorption maxima or emission minima. 
** Alteration suites at porphyry molybdenum deposits tend to contain more quartz than porphyry copper deposits. 
thus more easily detected with TIR sensors. Alteration zones are broad - >1km. 
**'*** Alteration zones progress outward from potassic to phyllic and argillic with abundant quartz stockwork to 
propylitic. 
646 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B7. Vienna 1996