Issued in 1970, this pair from Botswana’s Developing Botswana series highlights the country’s emerging mineral economy shortly after independence. The 35c stamp depicts the Orapa Diamond Mine, showcasing diamond cuts alongside an aerial view of the mine—symbolic of Botswana’s transformation into a major diamond producer. The 10c stamp illustrates Copper-Nickel Mining at Selebi-Pikwe, marking the industrial growth driven by base metals. Together, the set represents a key phase in Botswana’s economic history and is popular with collectors of African development, mining, and industrial themes.