Sampling of fine-grained fraction of soil (−200 mesh, b0.074 mm)
at a depth of 100–300 mm coupled with selective leaching (Wang,
1998a, 1998b) was utilized on 5 traverse lines over the Zhou'an
concealed Cu–Ni deposit. A clear ring-shaped anomaly of Cuwas identified
right over the deposit (Fig. 8). In addition, Tables 5 and 6 summarize
the analytical results of X-ray diffraction and statistical parameters of
fine-grained soil samples at the Zhou'an deposit respectively.