Furthermore, samples of fine-grained soil fractions (−160 mesh,
b 0.088 mm) at a depth of 150–300 mm were taken at a density of 1
sample/6 km2 at the Jinwozi goldfield. The samples were subjected to
the analysis of XRF and ICP-MS after a 4-acid treatment. The results
show a significant NE-trending gold anomaly coincident with the
ductile-shear zone hosting the 210 gold deposit (Fig. 5).
Samples of different soil fractions at different depths (A N 0.833 mm
(+20 mesh), 0.088 mm (160 mesh) b B b 0.833 mm (+20 mesh),
C b0.088 mm (−160 mesh) mm in Fig. 6) were taken along a transect
over the 210 deposit using improved Rotary Air Blast (iRAB) drilling.
XRF and ICP-MS after a 4-acid treatment were used to obtain geochemical
contents. A gold geochemical pattern indicated that the fine-grained
fraction (grain-size b 0.088 mm (−160 mesh), C in Fig. 6) delivers
stronger (with most Au anomalous value N 10 ppb) and relatively consecutive
anomalies over the deposit compared to those of relatively
coarse grained fractions (with most Au anomalous value between 3
and 10 ppb) (A and B in Fig. 6), and that gold is concentrated at the bottom and
at the surface with low concentrations in the middle (Lin et al.,
2014b). In addition, samples of grain-size smaller than 0.088 mm