The Soninke Wangara exchanged salt for Bambuk gold, though they kept the source of the gold a secret from Muslim traders, with whom they exchanged the gold for clothing and other Maghrib goods. The king received one dinar of gold for each load of Saharn salt imported from the north, and two for each load exported to the south, keeping each gold nugget for himself. Muslim secretaries were employed to keep records of the taxable trade. Yet, in the 11th and 12th centuries, the Bure goldfields were developed, so that by the end of the 12th century, Ghana no longer dominated the gold trade. The Soninke farmers and traders then settled further south and west in the early 13th century.