We described the vegetation of different age open-pit mining dumps in the southwestern part of Sakhalin Island. The 60 sample plots (5×5 m) were established on a surface of three dumps. Chenopodium album-Puccinellia distans community (average total cover 40%) formed on 4 age substrate; Tussilago farfara-Phragmites australis community (54%) on 10 age substrate, and Equisetum arvense-Phragmites australis community on 20 age tails. Increase of the vascular plants cover, floristic richness, and decrease of the bryophytes cover associated with age of dumps. We record a lot of diagnostic species of anthropogenic ruderal vegetation syntaxa (Artemisietea vulgaris, Polygono-Poetea annuae, Stellarietea mediae, etc.) in the communities of the first succession stages. In communities of 20-year substrate tree layer start to form (Betula platyphylla, Abies sachalinensis), and appear diagnostic species of fareastern tall-herb vegetation syntax (class Filipendulo-Artemisietea montanae). The well spontaneous revegetation restoration explained by the mechanical composition of the dumps substrates, mainly consisting of pelite fractions with high water retention property.