Safety Through Innovation. We have entered the Mining Industry with relevant equipment, designed to assist the Rock Engineering fraternity to monitor forces (due to movements) in the Hanging Wall (Roof) and Pillars in real time. The latest technology, which we are proud to have developed, is a world first with the capability of being used with conventional Cable Anchors and solid tendons. The EMCA (Electronic Monitored Cable Anchor) is designed to be integrated into the current Communication Systems presently used, in the Mining Industry to communicate directly with the Mine Control Room, and Rock Engineer office in the event of an incident. Contact Details. Sandbox Mining (Pty)Ltd, Andries Lottering 3 Lawrence Street, Birchleigh, Kemptonpark, 1618, 0792638486 andrieslottering04@gmail.com andrieslottering@ymail.com