Botswana, the world's largest producer of diamonds, plans to seek initial bids for the construction of an $11 billion railway line connecting its biggest coal-mining region to a port in neighboring Namibia. The land-locked southern African nation may list tenders by September to build a 1,500-kilometer (930-mile) rail line from its coal fields in the east to Walvis Bay in Namibia, Botswana ...
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