Extraction of structural and mineralogical features from hyperspectral drill-core scans


Extraction of structural and mineralogical features from hyperspectral drill-core scans

Tusa, L.; Andreani, L.; Pohl, E.; Contreras, I. C.; Khodadadzadeh, M.; Gloaguen, R.; Gutzmer, J.

For vein hosted mineralization such as encountered in porphyry systems, the documentation of the main alteration assemblages associated with specific vein generations is essential in understanding the geometry of the mineralized body. Hence, mineralogical and structural information are highly relevant for characterizing the mineralization. In this paper, we present an approach for the extraction of both mineralogical and structural information from hyperspectral scans. We propose a parallel framework which includes a typical mineral mapping technique for the extraction of mineralogical information as well as a ridge detection method for the extraction of veins applied on mineral abundance maps. In the proposed framework, the abundance maps are obtained from hyperspectral VNIR-SWIR drill-core scans using a linear spectral unmixing technique. Drill cores hosting porphyry stockwork type mineralization are used for the evaluation of the proposed technique and the experimental results show that the method offers a tool for accurately characterizing the mineralized body.

Keywords: core scanning; hyperspectral imaging; image segmentation; feature extraction; mineral mapping

Permalink: https://www.hzdr.de/publications/Publ-28429
Publ.-Id: 28429