TY JOUR TI The experience of using the classification system of Bulychev N. S. in engineering and geological forecasting of mineral deposits KW engineering and geological conditions KW epithermal gold and silver deposits KW rock mass KW classification by N. S. Bulychev KW engineering and geological model. JO Vestnik AGGE AU Kozlov, V.S. AU Abaturova, I.V. AU Savintsev, I.A. AU Shevaldin, D.A. PY 2025 IS 1 PB Association of Geologists, Geophysicists and Engineers