MAPUTO, July 12 (Reuters) - The central bank of Mozambique has fined Africa’s biggest lender, Standard Bank, $4.6 million for engaging in fraudulent activities, Bank of Mozambique said on Monday. The central bank also fined two of Standard Bank’s employees around $223,000 and $101,000 each, and barred the bank from engaging in some exchange-related activities for a year, it said in a statement. Standard Bank, which is based in South Africa, did not immediately respond to a request for comment. The central bank said following on-site inspections “infringement proceedings were brought against that bank (Standard Bank) and two of its managers ... for serious breaches of a prudential and exchange rate nature.” It alleged the bank and the two employees were involved in fraudulent manipulation of the exchange rate, implementing an illegal payments network based outside the country, and carrying out irregular operations of financial derivatives, among other offences. $1 = 62.9000 meticais Reporting by Manuel Mucari Writing by Promit Mukherjee Editing by Mark Potter Our Standards: The Thomson Reuters Trust Principles.