Gold in pedogenic carbonate revealed

Gold in pedogenic carbonate revealed Meivyn J. Lintern Chris G. Ryan Robert M. Hough  

Keywords goid, vegetation, mineral expioration, Au-Br, calcrete 

Samples were collected from a 2-m deep trench excavated prior to mining from the Bounty Gold Deposit in Western Australia. Bulk soil samples were analysed by ICP- 

A LSX-200 Plus Laser Ablation System (CETAC Technologies, Omaha, Nebraska, USA), using a Nd YAG laser with a wavelength of 266 nm, was used for the analyses. A spot size of 100 pm was selected. Sufficient volume of ablated 

SXRF imaging and XANES analysis were made at the PNC/XOR beamline at the Advanced Photon Source, Argonne National Laboratory (Heald. et al 2007) using photon energies of 17.0 and 12.5 keV for SXRF imaging and 11.8 to 12.1 keV for XANES analysis. XANES analysis across the Au L3 edge used steps of 5 eV (from 11.82 - 11.89 keV), 0.5 eV (from 11.89-11.97 keV) and 0.07 k (from 11.97-12.1 keV) with a one second dwell per step. 

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