Platinum group metals miners, Anglo American Platinum (Amplats), Impala Platinum and Sibanye-Stillwater on Friday signed a three-year wage agreement with unions, the Association of Mineworkers and Construction Union, the National Union of Mineworkers and UASA. Amplats noted in a statement on Friday that its wage agreement included an increase of R1 000 a month in basic pay, or 5.5%, whichever is greatest, for each year of the agreement.