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actinolite actinolite-schist amphibolite analysis appears banded ironstone basalt Basement Schists batholith Bindura biotite Calcium carbonate cent Chiweshe chloride claims colour composition country rock cross-cut dark green deposits diorite District east eastern epidiorite exposed farm fault feet felspar fine-grained fissures folding foliation foot-wall gneissic grains granite granite contact greenstones groundmass Gwanda hill hornblende hornblende crystals hornblende-schist igneous inch inclusions intrusion iron Karroo Kingsley Hoard kopje lavas Lightfoot Madziwa magma magnetite main reef main shaft Maparu series Mazoe river metamorphism miles mineral Mountain View farm nil nil occur outcrops oxide pegmatite phenocrysts Plate porphyritic porphyritic granite Price Prince of Wales pyrites pyrrhotite quartz veins quartzite Ratanyana ridge schist schist belt seams sedimentary sediments seen serpentine Shamva Shamva Grits Shashani sheared side Silica slide Sodium Southern Rhodesia sulphate sulphides surface thermal spring thin section valley vlei Wankie western width younger granite zone