Tin mining is one of the main sectors of the national economy where the Bangka Regency is the largest tin producer in Indonesia. However, this sector cannot be separated from the pros and cons for a long time. In a way, this sector can increase both national and regional income but on the other side, the adverse effects of it can threaten the survival of humans and the environment. Open tin mining activity has converted previously vegetated land cover become the nonvegetated land cover. Furthermore, the land cover changes to the mining area have a major impact on global warming which has become an international issue in the past few decades. This research aims to map and measuring land cover changes especially from vegetated to non-vegetated land cover related to tin mining activity in Bangka Regency. This research using multitemporal Landsat imagery data acquisition in the year 2004 (Landsat 5 TM) and 2017 (Landsat 8 OLI) through digital image processing using Maximum Likelihood Classifier method. Previously, the image as a classification input through relative radiometric normalization. The result shows that tin mining activity in Bangka regency for thirteen years causes an area reduction in vegetated land cover. These results are expected to be an important input in policymaking for local governments to support the action plan which leads to mitigation of climate change.