From the article "Why Is Zambia So Poor", we learn that

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At its peak, the Zambia Consolidated Copper Mines company employed more than 65,000 Zambians

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Most of the buildings in Kitwe, the roads, the health clinics, the schools, were built by the national mining company

At its peak, the Zambia Consolidated Copper Mines company employed more than 65,000 Zambians and carried out services like water delivery and waste collection for five cities