In terms of resources, Botswana is most well known for its diamonds — the gems account for one-third of the country's total gross domestic product, as well as 76 percent of its export revenue and 45 percent of its government's revenue. However, those impressive numbers are not expected to last. International Monetary Fund forecasts indicate that Botswana's diamond reserves are set to peak at 31 million carats in 2017, declining sharply three years later and then reaching depletion in 2029. If that outlook is correct, the African nation could be sitting in a fairly dire position 15 years down the line. Fortunately, Botswana is already taking steps to save itself. It is currently laying the foundation for economic diversification by expanding its diamond industry; its hope is that doing so will result in the development and expansion of other industries. Coal takes the lead Interestingly, it's starting to look like coal could be the country's savior. In an article published at the end of last week, Mining Weekly notes that back in 2012, Botswana's government put together a national strategy on coal development called the Coal Roadmap. Its goal is to "develop the country's infrastructure to take advantage of its ... coal reserves." Further, the government set up a Coal Development Unit within the Ministry of Minerals, Energy and Water Resources to fulfil a number of objectives, including the implementation of a strategic coal monetization plan and the improvement of the coal value chain. Thus far, the country's focus on coal seems to be going fairly well. In the same article, Mining Weekly quotes Sinethemba Zonke, an associate consultant at Africa Practice, as saying recently that the fuel's importance in Botswana is growing, and as a result, "could enable the country to diversify its exports."