Traditional methods of processing precious metals of Sakha people Varvara Dmitrieva, Liliya Sidorova, Lyudmila Amanbaeva, Anastasiya Vinokurova and Galina Evstafeva E3S Web Conf., 244 (2021) 05032 Published online: 19 March 2021 DOI: 10.1051/e3sconf/202124405032