This report describes the monitoring of microseismic activity maintained during several major phases of retreat mining in the 9 right section of Olga Portal #2 Coal Mine in Caretta, West Virginia. Significant observations were made regarding mining, stress indications, stability problems and microseismic event occurrence. The first part of the analysis of microseismic data was focused on recognition of parameters and mechanics of an individual microseismic source as an element of instability development. The second part of the analysis was oriented to determine the correlation between areal and temporal event distribution, mining situation, and geological parameters to improve the reliability of a bump forecasting technique. In particular, the microseismic data provided very descriptive and unique images of areal and temporal development of instability which resulted in a major multiple bump occurrence on June 3, 1985. Microseismic data and other observations suggest that a nonuniform horizontal stress distribution in the roof and floor is probably responsible for most of the bump and roof instability problems. Mining is the main cause of the stress concentration around mine openings. The instability distribution is influenced by the joint system.