The purpose of the study was to analyze the relationship between grievance management and employees' performance at Chibuluma and Luanshya mines in Zambia. Data was collected through a time tested questionnaire from 132 unionised employees from Chibuluma and Luanshya mines on the Copperbelt in Zambia. Pearson correlation and regression analyses were used to determine the relationship between grievance management and employees performance of unionised employees. The results of the correlation indicated a positive relationship between effective grievance resolution practices and employees performance at 0.01 level of significance. Furthermore, the study revealed a positive correlation at 0.01 level of significance between management's preparedness and willingness to resolve employees' grievances and employees' performance. Regression analysis showed that 33% (R2=0.328) of the variance in employees performance was accounted for by management's preparedness and willingness to resolveemployees grievances. In view of this, management at Chibuluma & Luanshya mines needs to pay special attention to effective grievance resolution practices and be prepared to resolve employees' grievances.