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In page Economy of the Central African Republic:

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The country has rich natural resources in the form of diamonds, gold, uranium, and other minerals.[1] Diamonds constitute one of the most important exports of the CAR, frequently accounting for 20-30% of export revenues, but an estimated 30-50% of the diamonds produced each year leave the country clandestinely.[citation needed] There may be petroleum deposits along the country's northern border with Chad.[1] (Two billion barrels of oil are present in private estimates).[citation needed]