Fig. 1 | Mineralium Deposita

Fig. 1

From: Chemical and physical heterogeneity within native gold: implications for the design of gold particle studies

Fig. 1

Heterogeneity in alloy composition revealed in polished sections and viewed in BSE imaging unless otherwise stated. a: Heterogeneous gold particle with numbered points indicating paragenetic sequence of alloy (placer gold particle, Moosehorn Creek, Yukon). b: Variation in Au–Ag ratios between placer gold particles indicated by intensity of X-ray map (particles from the Sperrin Mountains, N. Ireland). c: Gold particle showing a well-developed gold-rich rim (Bonanza Creek, Yukon, Canada). d: Gold-rich rim with inclusion of pyrrhotite within both grain core and rim (Bonanza Creek, Yukon, Canada). e: Subtle Au–Ag variation with diffuse boundaries (Boulder Creek, Atlin, BC, Canada). f: Thin Ag-rich tracks (1) and a thicker Au-rich /Ag-rich paired track (2) (Wexford, Ireland). g: Complex zoned domains confined to one edge of a gold particle (Coffee Creek, Yukon, Canada). h: Voids surrounding grains that are partially filled by pure Au (Clear Creek, Yukon, Canada). i: Homogeneous Au–Cu intermetallic compounds surrounding a Au–Ag core (River Ayr, Scotland). j: Heterogeneity in Cu and Au content, in alloy containing 0.2% Ag (Lake Turkana, Kenya). k: Exsolution of AuCu lamellae from patches of Ag-rich (Au: 82.8 wt.%, Ag: 16.2 wt.%, Cu: 1.2 wt.%) alloy adjacent to alloy of Au: 85.8 wt.%, Ag: 13.7 wt.%, Cu: 1–2 wt.%. (Balwoges, Donegal, Ireland). l: Compositional modification of Au–Ag–Cu alloy by formation of auricupride during grain recycling (Elatsite, Bulgaria). m: Patches of Pd- and Hg-rich alloy (3.2 wt.% Ag, 15.2 wt.% Pd, 22.9 wt.% Hg, dark gray) in matrix (8.9 wt.%Ag, 4.1 wt.% Pd, 6.9 wt% Hg, light gray) (Similkameen River, BC, Canada)

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