Intruders invaded Tanzania’s third leading gold producer, North Mara Gold Mine and stole pond liners from the mine’s waste ponds over the weekend, a spokesman for Tanzania Barrick Ltd., a unit of Canada-based Barrick Gold Corp. (ABX), owners of the mine, said Tuesday. The intruders stole around 90 square meters of pond liners on Oct. 3 and took 110 square meters on Oct. 4. The liners have been replaced.