Mineral extraction exerts a significant impact on the environment, particularly on the hydrological regime of rivers. The placement of tailings storage facilities in river valleys is a common practice in ore processing. Forest stands and river networks in such areas undergo intensive transformation involving large-scale deforestation with removal of the root-inhabited soil layer and alteration of river channels. As a result, the streamflow in the affected sections becomes less abundant. Since the 1970s, active tin ore mining and processing have been carried out in the Silinka River basin of the Khabarovsk Territory. Mining activities have produced technogenic landforms such as tailings storage facilities, open pits, and waste dumps, which pose both ecological and technogenic hazards and act as sources of pollution for groundwater, surface water, soil, vegetation, and the atmosphere. Forest cover is one of the key indicators determining river runoff and can be used to estimate the capitalized value of 1 km² of the study area. Using the Normalized Difference Vegetation Index (NDVI), this study assessed the impact of tin ore mining on the Silinka River basin. The results indicate a 10% decrease in the average capitalized value of 1 km² of the study area.