Abstract
The number of operating mines has fallen sharply for most mineral products, and the average size of mine risen, with the changes gathering momentum during the 1990s. The paper looks at trends in copper, zinc and gold, and then explores the relationship between size and unit costs in copper mining, separately for underground and open-pit mines, in order to ascertain the existence and importance of economies of scale. Changes in mine size have been accompanied by major technological and geographical shifts. There is only a weak relationship between the scale of mines and overall unit costs per tonne of copper produced. The paper discusses the data and explores some of the reasons.
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