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We present the new technique of galactic cosmic rays mass composition study above the knee by analysis of the shower maximum distribution measured at Tunka EAS Cherenkov array. The experimental data of three winter seasons of operation have been used in this analysis. The results are based on the large number of Monte Carlo simulations with the recent hadronic interaction model QGSJETII-04 for 4 nuclei groups: H, He, CNO, Fe. The elemental group spectra and mean logarithmic mass are discussed.