Identification of the process of hydromechanical extraction of amber Zinovii Malanchuk, Valerii Korniyenko, Yevhenii Malanchuk, Andriy Khrystyuk and Mykola Kozyar E3S Web Conf., 166 (2020) 02008 Published online: 22 April 2020 DOI: 10.1051/e3sconf/202016602008