Table T1. Analytical conditions used in the electron microprobe analyses of gold, sulfides, and oxides.
Cameca Camebax
Cameca SX-50
Take-off angle (°) 40 40 40 40 40
Acceleration voltage (keV) 20 15 20 20 15
Beam current (nA) 30 20 30 30 20
Beam size (µm) 1 1 1 1 1
Standards: Pure metal for Au, Ag, Cu, and CdSynthetic FeS2 and ZnS MgO, albite, apatite, MnTi, Cr2O3, and Fe2O3 Arsenopyrite, pyrite, pure Co, pentlandite, chalcopyrite, sphalerite, NIST AuAg80 alloy, stibnite, galena, AuAg40, and Bi2Se3 Pure Au and Cu, AuAg20, and cinnabar Pure synthetic oxides of Cu, Ti, V, Cr, Mg, and AlSynthetic MnTiO3; gahnite (Zn); bustamite (Si).

Note: Analyses performed at Instituto Geológico Mineiro (IGM), Portugal, and University of Toronto, Canada.