FIG. 6. Representative photographs of the ore zone and the concentrations of Pd in different rock types. Solid squares show the locations of samples used for Pd analysis after the photographs were taken. The Pd value of the melanonorite in the center of (C) is for a sample outside the field of view. The numbers in parentheses correspond to the rock types described in the text. Rock hammer for scale. A. Medium-grained melanogabbro breccia (2a) containing fragments of earlier leucocratic rocks (1b-c) in the northern section of the southern Roby zone. Note low concentrations of Pd in leucocratic rocks and a dike of late barren clinopyroxenite (3a) cutting the melanogabbro breccia (2a). B. Magma mingling between early leucogabbro (1d) and late melanogabbro (2c) from the southern portion of the southern Roby zone. C. Magmatic brecciation of late melanonorite (6) and earlier norite (5) in the Twilight zone.