South Sudanese pan for gold in Nanakanak, in the eastern part of the impoverished country. Tens of thousands of informal miners are looking for gold, and the government is trying to attract international mining companies to carry out the search on an industrial scale. Hannah McNeish/AFP/Getty Images hide caption

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Families wait for hours to register at the Yida refugee camp in South Sudan along the northern border in early July. Within a few weeks, the population of the camp more than doubled, leading to shortages of food, water and medicine. Paula Bronstein/Getty Images hide caption

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The South Sudan delegation, including Vice-President Riek Machar Teny-Dhurgon (second from right), are congratulated by a delegate as they take their seats after the U.N. General Assembly voted to admit the newly formed nation. Stan Honda/AFP/Getty Images hide caption

itoggle caption Stan Honda/AFP/Getty Images