A technique to provide context-indexed network sections is proposed in this paper for designing exploration lines and bore holes, which would be facilitate for compiling profiles on exploration lines and probing into attitude of deep-seated ore bodies. Seven circumstances that may occur in delineation and extrapolation of resources/reserves at grade ative="False" HasSpace="True" SourceValue="333" UnitName="in">333 in buried structural altered style, quartz vein-altered type molybdenum mineralized area and five circumstances occurring in delineation and extrapolation of engineering ore bodies at meter percent value are depicted in this paper. Resources/reserves of low-grade ores should be delineated and estimated.