Prime Minister of Rhodesia held the post until the end of Federation on 31 December 1963. When Northern Rhodesia gained independence as Zambia on 24 October 1964, Southern Rhodesia began to refer to itself simply as "Rhodesia". Prime Minister Ian Smith's government issued a Unilateral Declaration of Independence from Britain in 1965, and he remained Prime Minister when the country was declared a republic in 1970. Under the Internal Settlement in 1979, after a long period of conflict, the country became known as Zimbabwe-Rhodesia, with Abel Muzorewa as its first black Prime Minister. None of these acts were recognised internationally, and under the Lancaster
Northern Rhodesia BSAC claimed to own mineral rights over the whole of Northern Rhodesia under concessions granted between 1890 and 1910 by Lewanika covering a poorly defined area of North-Western Rhodesia or negotiated by Joseph Thomson and Alfred Sharpe in 1890 and 1891 with local chiefs in a disputed area of North-Eastern Rhodesia. This claim was accepted by the British Government. After the Charter ended, BSAC joined a group of nine South African and British companies which financed the development of Nchanga Mines, to prevent them falling under US control. However, its main concern was to receive royalties. However significant they were,