High density aggregates of iron ore are imported by petroleum sector in Egypt, for utilization in manufacturing of concrete mix used for coating of offshore petroleum pipelines. The heavy aggregates form up to 75% of the concrete mix, depending on the final density desired for the reinforced concrete coating. These aggregates are composed of well graded angular to sub angular grains of high density aggregates, In earlier studies we succeed to found the Egyptian Ilmente ore adequate for concrete weight coating and already utilized for many pipeline projects in Egypt. In this study the evaluation of Um Bogma manganese-Iron ore to be used in subsea pipeline concrete weight coating, meantime the ore by product is available by huge quantities in Sinai Manganese Company. The laboratory and field tests conducted for the manganese ore forming concrete mix, which composed from manganese ore, cement and fresh water according to coating specification requirements, the ore produces a concrete mix of 175-185 pcf (2804-2964 Kg/m3) minimum dry density and compressive strength varying from 40-48 N/MM² (400-480 kg/cm²) which satisfied the standard specification of submarine pipeline coating.
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