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420 drift Distance 65 degrees 8x natural 8x natural size abundant altered to impure altered to talc assay associated Au per ton bands Calcite Calculated pyrite value Central belt chalcopyrite country rock criteria cross-faults crystallized pyrite crystals see Plate degree of crystallization diorite Distance above level Easyz Bird vein estimated degree euhedral feet fissures free gold gold content gold value gouge hanging-wall side high gold highly altered impregnation of metadiorite inches inclusions incompletely altered indication intrusion irregular and massive Magnification massive and irregular massive bull massive pyrite mesothermal metadiorite area mineral mining north-south vein system numbers ║║ perfect cubical crystals polished sections Position in vein precipitation present principal constituent pyrite contains pyrite crystals pyrite cubes Pyrite percentage raise Distance region Replacement ſae seams silica slightly fractured small amount ſ║ speci Specimen ITo sulphide tion transparent transverse faults vary vugs wall-rock walls