Namdeb's Mining Licence 42 extends along the Orange River for about 50 kilometres inland from the Mining Area 1 (MA1) eastern boundary to Sendelingsdrif near the town of Rosh Pinah. This licence area is referred to as Orange River Mines and contains some of the highest value diamonds in the world.

Located along the Orange River, Sendelingsdrif Mine is the second largest diamond deposit within the Orange River Mine’s mining licence area after Daberas mine. Sendelingsdrif was inaugurated in 2014 by His Excellency; former President of The Republic of Namibia; Hifikepunye Pohamba.