Public holidays in Rhodesia weekend". Shangani Day was replaced as a public holiday by Occupation Day in 1920, but continued to be unofficially marked thereafter. Occupation Day, held on 12 September each year, marked the anniversary of the arrival of the Pioneer Column at Fort Salisbury in 1890, and their raising of the Union Jack on the kopje overlooking the site. It was renamed Pioneers' Day in 1961. Southern Rhodesia effectively became the entirety of Rhodesia in 1964 when Northern Rhodesia became independent as Zambia. After Southern Rhodesia's colonial government unilaterally declared independence from Britain on 11 November 1965, the anniversary became celebrated as
Northern Rhodesia cattle farming in Barotseland, but Northern Rhodesia had attracted little white settlement, in contrast to its southern neighbour. Unlike Southern Rhodesia, which had seen a flood of fortune-seeking prospectors seeking to set up independent mines, Northern Rhodesia's mining policy was to agree large-scale deals with major commercial mining companies. Large-scale mining on the Northern Rhodesian Copperbelt started after 1924 and was mainly financed from the United States of America and South Africa. Chester Beatty's and Sir Edmund Davis's Selection Trust already had an interest in the fairly small Bwana Mkubwa copper mine, which had opened in 1901 on the site