Estoppel Labour Law cases decided in the South African Courts (Highlights and updated 6 1997 to 6 2025 [Copyright: Marius Scheepers/15.7.1]) Estoppel, Evidence. Estoppel The principle of estoppel has been held to be applicable in the field of labour relations. This was confirmed in the case of Chamber of Mines of SA v NUM 1987 (1) SA 668 (A) and in Maluti Transport Corporation Ltd v MRTAWU & Others (1999) 9 BLLR 887 (LAC), JR514/08 South African Revenue Services v CCMA & Ot
