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93 ISGMT alteration Ankang anomaly Archean auriferous average backfill belt blasting block body bolts bulldozer cement China Chinese yuan cost country rock density depth deslimed mill tailing dip angle distribution dolomite dredge dredger drilling effect equipment exploration fault fill flocculation footwall fracture zone geological gneiss gold deposits gold mines gold recovery grade granite gravels haulage Heilongjang holes hydrothermal increased Inner Mongolia lower magmatic material metallogenic metamorphic migmatite mineralization mining district mining method mylonite operation orebody parameters permafrost placer gold placer mining production Proterozoic Province pyrite quartz quartz vein ratio resuing riffles rock mass roof samples scraper drift shaft shear shotcrete sill pillar slice sluice sluiceboxes stopc stope stress structure sublevel surface Table thickness tion trend unconfined compressive strength underground ventilation system vertical width Xiangxi Zhaoyuan