Lithium Pegmatite Index
Lithium-bearing mica read by where its absorption sits, which is what separates a lepidolite dyke from ordinary white mica.
Maps lithium-bearing mica by how its signature differs from ordinary white mica.
Open-pit mining in arid terrain, the kind of ground the index is built to screen.
WHAT THE SENSOR SEES
What this layer looks for.
The laboratory reference for each material, and what the sensor's band spacing captures of it. The shaded band marks the range the method reads.
WHAT IT FINDS
What it detects.
| Material | Typical setting | What can confuse it |
|---|---|---|
| Lepidolite & Li-Muscovite | LCT pegmatite dykes and lithium granites | Ordinary white mica in barren granite |
METHOD
How it works.
Calibrated reflectance goes in, and every pixel is fitted against a public reference library.
Continuum removal over the white-mica window
Continuum removal restricted to the narrow range where the mica signature sits.
Absorption position extraction
Locates the wavelength of the absorption minimum by fitting across neighbouring channels. Interpolation between band centres is not the same as resolving them, and the precision claimed here is bounded by the sensor sampling.
Dyke swarm delineation
Connects pixels whose absorption sits short of the ordinary white mica position along a common strike.
Evaluability masking
Alluvial sand, dry grass and shadow are removed. Dry grass matters more than it sounds: its cellulose absorption sits close enough to confuse a mica reading.
SPECIFICATIONS
What you get, and what it runs on.
Conditions it needs
Method and checks are documented in Axine Applied Spectroscopy Paper #1 · Section 7.1.
Scope
An indicator for lithium-bearing mica, not a grade estimate. Spodumene itself is not reliably separable.
RUN IT OVER YOUR GROUND
Run this layer over your own area.
Order processing over your area of interest, or a tasked capture where the archive has nothing usable. Imagery access is never charged for: a plan buys the models.
COMPLEMENTARY ANALYTICS
Related layers.
Alteration Mineral Mapping
Per-pixel alteration mineralogy separating advanced argillic, phyllic and propylitic assemblages.
Gossan & Iron Oxide Speciation
Separates hematite from goethite, and reports the related iron-hydroxyl reading as a ferric class.
Alteration Cluster Detection
Vectorised clustering that pulls out the core hydrothermal hubs and the nodes worth working outward from.