Oriented-core facilities are crucial in exploratory drilling for several reasons. These include structural information, understanding formation stress, maximizing resource recovery, fluid flow prediction, porosity and permeability analysis, directional drilling support and reducing non-productive time with cost efficiency. Different steps such as (i) detail mapping and (ii) sketching are followed before commencing any borehole for sub-surface drilling. After getting the solid cylindrical drill cores from sub-surface geologic units, the depth-wise variation in rock characters are studied to match the predicted analogy. The study of litho-structural attributes from the cylindrical cores can give some information on geologic settings of different rock units vis-a-vis deformation structures, alterations, slips, compression-extension directions etc. These in turn can reveal (mineralized) fluid movements and zones of weakness to demarcate possible loci of mineralization. Determination of actual attitude of different structural features, e.g., micro-cracks/fractures/joints, faults, hinges and axial planes of folds, intersection of different planes, unconformity, alteration zone require study of oriented drill cores. Although we are accustomed with the general appearance of rock structures in the exposed outcrops in terms of plan or section views, the same structures can often create ambiguity when observed in cylindrical drill cores. From a single drill core, large-scale features cannot be interpreted. However, cumulative study of small-scale features can give clues to interpret regional features.