SURFACE WORKING (MINING)
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BTMINING METHODS + METHODS OF WORKING (MINING)
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UDC622.271
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Descriptor GEROBERIRDISCHER ABBAU + TAGEBAU (BERGBAU)
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Descriptor ENGSURFACE WORKING (MINING)
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Descriptor FREEXPLOITATION À L'AIR LIBRE (INDUSTRIE MINIÈRE)
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Variant GERABBAUVERFAHREN/OBERIRDISCHER ABBAU (BERGBAU)
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Variant GERTAGEBAU (BERGBAU)
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Variant ENGSURFACE MINING (MINING)
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Variant ENGWORKING/SURFACE WORKING (MINING)
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Variant FRESURFACE/EXPLOITATION EN SURFACE, À L'AIR LIBRE (INDUSTRIE MINIÈRE)
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Variant FREEXPLOITATION À CIEL OUVERT (INDUSTRIE MINIÈRE)
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NTDUMPS + DUMPING + WASTE DUMPS (MINING)
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NTUNDERWATER WORKING (MINING)
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NTDUMP DEVELOPMENT SCHEMES (MINING)
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NTQUARRYING (MINING)