The study explores the use of Tracer Dilution Profiles (TDP) to identify fault interconnections by varying external stress (pumping). Conducted at the Renard Mine (Canada), it revealed that a parallel fault, rather than the SDZ, was the main water-bearing structure. Using TDP, the mine was dewatered in 5 days at only 15% of the initial budget. Water chemistry analysis confirmed the distinction between the two faults. The TDP method proved faster and more effective than conventional tests for optimizing mine dewatering.