LONDON, May 22 (Reuters) - West Africa-focused miner Afferro AFFA.L AFF.V has agreed to a $190 million cash-and-paper offer from investment group IMIC IMIC.L , it said on Wednesday. Under the terms, IMIC will, for each Afferro share, offer 80 pence in cash and a 2-year convertible loan note with a principle value of 40 pence. Afferro shares closed on Tuesday at 70.5 pence. IMIC's bid promises to resolve the infrastructure problems that have held back Afferro's flagship asset, the Nkout iron ore project in Cameroon, through a separately secured partnership with a subsidiary of China Railway Group. (Reporting by Clara Ferreira-Marques; Editing by Mark Potter) ((clara.ferreira-marques@thomsonreuters.com)(+44 207 542 3214)(Reuters Messaging: clara.ferreira-marques.thomsonreuters.com@reuters.net)) Keywords: AFFERRO IMIC/