Mali runs on 230 V at 50 Hz, with sockets following Types C and E. No surprises on voltage: Mali runs at 230 V, the same range as at home in the UK.
Handy for multi-stop trips: Congo, The Democratic Republic of the, Djibouti, Tunisia and Gabon use the same plug types. Travelling further to Nigeria, Ghana and Zambia means a different adapter. Across Africa this setup is common: 21 of 55 countries.
Protective earth
Grounded and ungrounded sockets may occur
Earthed sockets (Type E) and unearthed ones (Type C) exist side by side. For metal-bodied appliances the protective-earth path is what matters.