Statewide Estimates of Undiscovered Deposits of Gold, Silver, Copper, Lead, and Zinc

McCammon, Richard B.; Root, D.H.; Schruben, Paul G.

doi:10.1023/b:narr.0000046921.05891.4a

Cited by 3 publications

(2 citation statements)

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“…Other than the quartz spectrum, all the other spectra have distinctive absorption features at wavelengths of approximately 2.2 µm, although each absorption feature differs slightly in position and depth. In order to delineate predominant minerals in hydrothermal alteration zones associated with the epithermal deposits, hyperspectral band ratio images (Lillesand et al 1994) were created using the HyMap SWIR 2 bands corresponding to the wavelengths indicated in Fig. 3, namely, bands 103/107 (2.100/2.171 µm), bands 107/109 (2.171/2.205 µm) and bands 118/112 (2.357/2.258 µm).…”

Section: Data For Hydrothermal Alteration Evidencementioning

confidence: 99%

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Deriving Optimal Exploration Target Zones on Mineral Prospectivity Maps

et al. 2008

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This paper describes a quantitative methodology for deriving optimal exploration target zones based on a probabilistic mineral prospectivity map. The methodology is demonstrated in the Rodalquilar mineral district in Spain. A subset of known occurrences of mineral deposits of the type sought was considered discovered and then used as training data, and a map of distances to faults/fractures and three band ratio images of hyperspectral data were used as layers of spatial evidence in weights-of-evidence (WofE) modeling of mineral prospectivity in the study area. A derived posterior probability map of mineral deposit occurrence showing non-violation of the conditional independence assumption and having the highest prediction rate was then put into an objective function in simulated annealing in order to derive a set of optimal exploration focal points. Each optimal exploration focal point represents a pixel or location within a circular neighborhood of pixels with high posterior probability of mineral deposit occurrence. Buffering of each optimal exploration focal point, based on proximity analysis, resulted in optimal exploration target zones. Many of these target zones coincided spatially with at least one occurrence of mineral deposit of the type sought in the subset of cross-validation (i.e., presumed undiscovered) mineral deposits of the type sought. The results of the study showed the usefulness of the proposed methodology for objective delineation of optimal exploration target zones based on a probabilistic mineral prospectivity map. P. Debba ( ) CSIR, Logistics and Quantitative Methods, CSIR Built Environment,

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Section: Data For Hydrothermal Alteration Evidencementioning

confidence: 99%

“…Band ratioing images can convey information, attributable to spectral properties of surface mineral, independent of variations in scene illumination. We used an arctan transformation on the band ratios (Lillesand et al 1994), which considered the gradient of spectral data between two bands.…”

Section: Data For Hydrothermal Alteration Evidencementioning

confidence: 99%