Prospecting for Gold Mineralization Using Geochemical, Mineralogical, and WorldView-2 Data: Siyah Jangal Area Case Study
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Original Paper
Prospecting for Gold Mineralization Using Geochemical, Mineralogical, and WorldView-2 Data: Siyah Jangal Area Case Study, Northern Taftan Volcano, SE Iran Mohammad Saeedi,1 Majid H. Tangestani ,1,4 and Arash Gourabjeri2,3 Received 14 April 2020; accepted 29 August 2020
This study applies a combination of geochemical, mineralogical, and WorldView-2 (WV-2) data for gold prospecting in the Siyah Jangal area, southeastern Iran. Geochemical and mineralogical studies, image processing, and field studies were used to identify areas of highpotential gold mineralization. Elemental concentrations in samples collected from exploration trenches in a well-known gold mineralization area were applied to identify Au pathfinders using bivariate and multivariate statistics. Visible-near infrared-shortwave infrared spectroscopy was applied to identify mineral phases. Correlation analysis, principal component analysis, and cluster analysis of measured element concentrations showed that Au has strong associations with As, Pb, Fe, and Cu, among which, Fe is the only element that forms major minerals in the area. The spectroscopy analyses showed that iron oxide-hydroxide bearing minerals including jarosite, hematite, and goethite are the major Fe-bearing phases in the surficial environment. Therefore, mineral fraction images of these minerals were produced by performing matched filtering method on WV-2 data, and the fractions of more than 0.25 of goethite, 0.15 of hematite, and 0.10 of jarosite were combined and converted as map layers to generate a false color composite (RGB) image for targeting potential areas of gold mineralization. The accuracy of iron oxide-hydroxides mapping was proven by field observations and XRD analyses of surficial samples. Moreover, concentrations of Au in samples collected from exploration boreholes in previously mapped areas showed good correlations between enhanced areas by remote sensing studies and gold occurrences. KEY WORDS: Gold mineralization, Geochemical analysis, Pathfinder elements, Indicator minerals, WorldView-2, Matched filtering.
INTRODUCTION
1
Department of Earth Sciences, Faculty of Sciences, Shiraz University, Shiraz, Iran. 2 Department of Geology, Science and Research Branch, Islamic Azad University, Tehran, Iran. 3 Abad Rahan Pars International Group, Tehran, Iran. 4 To whom correspondence should be addressed; e-mail: [email protected]
Gold is a rare element with crustal abundances of about 3 ppb (Taylor and McLennan 1995). It occurs in different deposit types (Pohl 2011), and its exploration is important for geologists due to its uses in jewelry, industrial purposes, bar hoarding for investment, and for coin and medallion manufacture (Christie and Brathwaite 1997; Pohl 2011). The Siyah Jangal gold deposit occurs in the TaftanQalehzari gold bearing zone which is known as the
2020 International Association for Mathematical Geosciences
Saeedi, Tangestani and Gourabjeri most important district of gold production in E-SE of Iran (Ghorbani 2002, 2013). It has alr
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