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Reconnaissance mapping and core drilling for subsurface limestone deposit investigation in Mbiabong Ukwa area and environs was carried out using a hybrid but simple rotary core recovery rig- GX-Y-1. The reconnaissance was done in a way that reasonably covered the whole area of interest in either direction (East to West, North to South). Fresh samples were randomly chipped out of the outcrops in-situ at about 50-100 m distance except where there is outcrop exposure of special interest. A base Map projection of Nigeria, Map Grid:- Datum: WGS-84, 1984 (NAD-83); Zone: 32 (UTM-32 Northern hemisphere) was used in all work undertaken for this Mineral Resource evaluation. Drilling was planned and set-out using the local grid at 1 km along strike and 200 m dip wise. Recovered core log were sequentially boxed into core boxes, lithologically assayed and tape measurements of litho strata imported into Rockworks 16 software environment for interpretation.