The study of migrant labour in Africa has tended to emphasize social form rather than historical context. This study of the immense migrant labour force that worked the Northern Nigerian tin mines is placed in the context of the ongoing subsumption of labour and existing social relationships by capital. Colonial conquest was required for the establishment of tin mining in Nigeria on a capitalist basis to serve the industrial needs of the West. Pre-colonial social organization prevented the release of sufficient labour for this purpose. After conquest, a migrant labour force was built up in conjuncture with a growing reserve army of labour by means of cash taxation, penetration of the market, weakening of slavery and state use of forced labour. In the second decade of the twentieth century there was substantial pressure from mineowners for the colonial regime to institute Rhodesian-style labour recruitment methods, but this was ultimately rejected because of the costs involved, the desire to encourage cash crop growth and the overarching aim of social stability. As a result, it was largely market forces which threw up the pool of labour that worked the mines, notably from the cash crop poor parts of Northern Nigeria and neighbouring French colonies. Initially, migrant labour was the most satisfactory option for many Northern Nigerian peasants, whose wages earned most in the pre-World War I era. The purchasing power of a miner's wage tended to decline, but social forces continued to throw up cheap labour. In World War II, the state instituted forced labour to mine tin, but the scheme was expensive, unproductive and opposed by business. The 1940s represented the nadir of worker poverty and the war was followed by a period of heightened social and political resistance to capital and the state. The tin mines both helped to cause and profited from the decay of the older mode of production in Northern Nigeria.
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