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The magnetic field and temperature dependencies of the magnetization and electrical resistance of the DyMnB 4 ternary compound have been measured up tp 14 T and within the temperature range 4.2-300 K. The magnetization of DyMnB 4 shows a complex behavior due to the presence of two magnetic sublattices. In zero magnetic field the electrical resistance has a temperature dependence typical of metals with a magnetic contribution of 0.38 μΩcmK -1 in the temperature range between 4.2 and 22 K. Our data suggest the occurrence of a transformation from the metallic state to the non-metallic state in a magnetic field up to 13 T. As a result the magnetoresistance of DyMnB 4 at temperature below ~22 K strongly increases with the decreasing of temperature and at 4.2 K and in a magnetic field of 13 T reaches about 300% of its zero-field value.