· Nigeria: Crush Rock Displays Colourful Quality Products 30 May 2005. . and modern quarries at Ishiagu ( Ebonyi State), Calabar ( Cross Rivers State), Abuja (FCT) . »More detailed. Michael Nelly – Port Harcourt, Engineer at crushed rock company . Michael Nelly has worked at Engineer at crushed rock company (Staff), studied at college of agriculture ishiagu, lives in Port .