which has been fairly steacy in recent years, fell by 86,000 ton­ nes in 1981, following strikes in Australia, Canaca, Irelano, Mexico, Sweden ano the Unitec States. However, production was higher in Africa. There has been no increase in leac mine capacity in the last decade apart from the Black Mountain project in SouthAfrica in 1980. ':table IV.D.1 Mininr production, 1979-1982 -----------------------------------------------------------------Unit 1979 1980 1981 1982 -----------------------------------------------------------------Bau:xi te •ooot 13 100 1 2 750 1 2 617 1 2 617 Cobalt tonnes 1 9 618 20 215 19 847 Copper '000t 1 084 1 146 1 1 58.3 065.6 Diamon cs 'OOOc 9 696 19 408 1 2 499 Gol c kr 26 277 26 534 21 840 I ron •ooot 20 504 20 11 6 17 320.9 Lead '000t 187 197 190: 1 190 Maneanese •ooot 2 706 2 549 746 'lin tonnes 0 600 9 500 8 300 J Uranium §:./ tonnes 4 641 5 162 5 388 4 693 Zinc •ooot 177 159 172.4 171 Source: f·1onthly Bulletin of Statistics, vol. XXXII, No. 1 and vol. XXXVI, No. 6; Yearboc~ of Industrial Statistics, 1979 Edition, vol. II (Unitec Nations publications, Sales No. E.81.XVII.9); Minerals Yearbook 1980, vel. I (Washinrton, U.S. Government Printinf Office, 1981); Werle f'Jetal Statistics, vol. 27, No.12 (December ~974), vel. 32. No.10 (October 1979) ano vol. 35, No.7 (July 1982); anc ECA secretariat estimates. §:./ Fieures for Gabon anc the Nirer only. 80 E/ECA /Cr1. 9/5 157. The supply of secondary materials of lead fell slightly in 1981 to account for just uncer 40 per cent of the total. (~) I ron Ore 158. · Production of iron ano steel aeclinec in mos-t of the in­ dustrialized countries in 1981. Iron ore production was es­ timated at 863 million tonnes, about 2.6 per cent less than in 
**Analysis**
The text primarily discusses the production and supply of various minerals, including iron, copper, lead, and zinc, as well as the impact of strikes on the industry. It also provides data on the production of these minerals in different countries. The text does not explicitly discuss economic development, agriculture, forestry, fishing, transport, communication, international trade, health, education, employment, humanitarian aid, or culture. The text is more focused on the natural resources and environmental aspects, specifically the mining industry.

**Category**
Natural resources and environment, Industry