SPECTRALEXPLORER
Mineral Exploration · Sentinel-2 · Spectral Index Analysis
Turn satellite imagery into mineral targets.
20+ spectral indices. 4 mineral systems. No installs.
20+ spectral indices. 4 mineral systems. No installs.
20+ Spectral Indices
U-V · Cu · Zn-Pb · REE
Sentinel-2 · GeoTIFF · JP2
← → navigate · Space advance
Mineral Systems
Four deposit types.
Click each system to see which indices it uses.
Click each system to see which indices it uses.
⚛️
U-V Sandstone Roll-Fronts
Uranium-vanadium deposits in continental redbed sequences. Targets redox boundaries and bleached sandstone zones using Compound Bleaching and Redox Boundary indices.
🟤
Copper Porphyry / Oxide
Cu carbonate (malachite, azurite), chalcocite alteration halos. Cu Carbonate, Azurite, and Chalcocite indices resolve gossan and supergene enrichment zones.
🫧
Zn-Pb Polymetallic
Zinc-lead gossan and carbonate host rock targets. Zn/Fe Gossan, Zn-Pb Carbonate, and Clay Hydroxyl indices map alteration halos and carbonate dissolution.
✨
REE / Ti Placers
Rare earth element and titanite placer deposits. REE Carbonaceous Shale, Ilmenite/Titanite, and Mafic Silicate indices highlight heavy mineral concentrations.
Click a mineral system above to see its index suite and detection strategy.
Data Input
Supported Formats
Click any file to see format details
Click any file to see format details
📁 S2A_MSIL2A_20240315.SAFE SAFE
📄 MTD_MSIL2A.xml XML
📁 GRANULE /
📁 R10m — 10m bands
🖼 T54HVE_B02.jp2 JP2
🖼 T54HVE_B03.jp2 JP2
🖼 T54HVE_B04.jp2 JP2
📁 R20m — 20m bands
🖼 T54HVE_B11.jp2 JP2
🖼 T54HVE_B12.jp2 JP2
🖼 custom_8bit.png PNG
🖼 multiband_16.tif TIF
📁 Sentinel-2 .SAFE Folder
Drop or select the root .SAFE directory. SpectralExplorer auto-discovers all band files (R10m, R20m, R60m), reads MTD_MSIL2A.xml for metadata, and constructs the full band stack for index computation.
🖼 JPEG 2000 (.jp2 / .j2k)
Native Sentinel-2 delivery format. 16-bit reflectance values (0–10000 scale). SpectralExplorer reads these directly via imagecodecs — no GDAL required.
🖼 GeoTIFF / PNG / JPG
8-bit, 16-bit or 32-bit float GeoTIFF accepted. PNG and JPG as single-band or RGB. Multiband TIFFs automatically split into individual band channels for flexible index building.
▸ BAND MAPPING
SpectralExplorer maps Sentinel-2 bands to index formulas automatically.
B02=Blue · B03=Green · B04=Red · B08=NIR · B11=SWIR1 · B12=SWIR2
SpectralExplorer maps Sentinel-2 bands to index formulas automatically.
B02=Blue · B03=Green · B04=Red · B08=NIR · B11=SWIR1 · B12=SWIR2
Spectral Index Library
20 indices across 5 geological categories.
Click any index to see its formula and target mineral.
Click any index to see its formula and target mineral.
⬜ U-V
⬜ Cu
⬜ Zn-Pb
⬜ REE/Ti
⬜ Base / Alteration
Geological Model
U-V Sandstone Roll-Front
Click zones to see index targets
Click zones to see index targets
🔴 Oxidised Zone
Fe³⁺ rich — Fe Oxide Ratio, Gossan/Fe Enrichment, As Jarosite indices. Hematite and jarosite spectral signature. Upflow face of roll-front.
🟡 Roll-Front Boundary
Redox transition zone — Redox Boundary (V⁵⁺/V⁴⁺) index detects the vanadyl-clay interface. Compound Bleaching peaks here. Primary ore crescent target.
🟢 Bleached Zone
Fe²⁺ dominant reduced sandstone — Compound Bleaching, Ferrous Iron, Clay Hydroxyl indices. Color contrast vs unaltered rock strongly visible in SWIR bands.
💚 Organic Reductant
Carbonaceous shale reductant band — Geobotanical Stress, REE Carbonaceous Shale indices. Organic carbon controls the spatial position of the redox boundary.
⬛ Unaltered Host Rock
Background silicate host — Silicate Host-Rock Proxy, Natural Colour for reference. Sets the spectral baseline for all anomaly detection downstream.
Workflow
7-Step Exploration Pipeline
Click each step to work through the analysis — in order.
Click each step to work through the analysis — in order.
Index Interpretation
Compound Bleaching Index
Best U-V roll-front indicator. Drag sliders.
Best U-V roll-front indicator. Drag sliders.
INDEX VALUE SCALE — Compound Bleaching
-1.0 Oxidised-0.30.0+0.3+0.7 Bleached
Formula: (B11 − B04) / (B11 + B04) · tuned for Fe²⁺ vs Fe³⁺ discrimination
Index Value-0.60
Pixel Density (%)12%
Spatial Coherence30%
Live Anomaly Assessment
🔴
OXIDISED / NO ANOMALY
Index value in negative range. Fe³⁺ dominant signature. Increase value toward +0.3 to find bleaching.
Index Val
-0.60
Density
12% ▼
Coherence
30% ▼
Try: Index → +0.45 · Density → 35% · Coherence → 70%
Watch all three gauges turn green ✓
Bleached anomaly confirmed when:
Index > 0.3 · Density > 25% · Coherence > 60%
Watch all three gauges turn green ✓
Bleached anomaly confirmed when:
Index > 0.3 · Density > 25% · Coherence > 60%
Target Detection
From Anomaly to Drill Target
Click a target type to see composite scoring logic.
Click a target type to see composite scoring logic.
TIER 1 — HIGHEST PRIORITY
Roll-Front Intersection
Compound BleachingRedox BoundaryClay HydroxylGeobotanical
All four primary U-V indices fire simultaneously. Spatial coherence >65%. Redox boundary trending into unconfined aquifer geometry. Composite score >0.8.
TIER 2 — HIGH PRIORITY
Bleached Zone + Organic Carbon
Compound BleachingREE ShaleFerrous Iron
Bleaching confirmed but no vanadyl clay signal. Organic reductant detected via REE Shale index. Likely footwall of ore crescent. Drill oblique up-dip.
TIER 3 — MODERATE PRIORITY
Gossan Anomaly
Fe Oxide RatioGossan/FeAs Jarosite
Oxidised cap gossan detected. Possible Cu-Zn-Pb system at depth. No bleaching signal yet — may be distal expression. Warrants geochemical follow-up.
TIER 4 — LOW PRIORITY
Clay Alteration Halo
Clay HydroxylAlteration CompositeNorm Clay
Argillic alteration halo only. No redox or bleaching signal. Could be distal to a concealed system. Flag for regional baseline — review with structural data.
Ready to find your next target?
Spectral intelligence
for the field geologist
for the field geologist
Sentinel-2 · Windows 64-bit · PyInstaller .exe
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Spectral Indices
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Mineral Systems
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Input Formats
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Installs Required