text: 900,000-tonne increase had to be stockpiled because of the depressed international market. The new mine at Ben Guerir produced 1.6 million tonnes in 1981. 171. The Tunisian industry continues to work towards the long­ term objective of doubling its production. In addition to adding capacity in the GSA area, it is commissioninf a feasibility study for a large mine in the north-west. By contrast the A le:erian State concern has curtailed plans for further e~pansion. 172. Among other African producers, Togo had a bad year in 1981, when reduced sales led to a 25 per cent cut-back in produc­ tion. The Taiba mine in Senegal saw its output return to normal in 1981, after a los.s in procucti on in. 1980 when the mine site was change d. (j_) Diamonds 173. 1981 was a traumatic year fer the cliamonc industry: as predicted, Zaire broke with the Central Selling 0 rganizati on, whose sales fell by 46 per cent. Prices fell progressively throughout the year, and production was also reduced, with the biggest fall in Zaire. Only South Africa showed an over-all in­ crease in production as a result of a new treatment plant coming on stream. 174. South A.frica 's total ciamonc production increased quite consi ce rably, while A neolan diamon c output is believe c to have fallen marginally. In Sierra Leone, total production again fell. In Botswana, combined output from the Orapa and Letlhakane mining complex fell by 2. 77 per cent. The A kwatia mine in Ghana, which · has been in production since the 1920s, is now facin€ serious financinf troubles and fallinr output. In Namibia production at · the CIM mine fell. In Lesotho, there was a slifht decline in grade to 2.8 ct/100T, and total production fell marginally. Production from Zaire's Miba Mine has been decreasing for some years. 
analysis: The text appears to be discussing the production and industry of diamonds, specifically in Africa. It mentions various countries and their production levels, as well as challenges faced by some of them. The focus is on the economic and industrial aspects of diamond production, with no mention of other sectors.