TY JOUR TI THE USE OF PERSONAL PROTECTIVE EQUIPMENT IS A SOCIO–ECONOMIC FACTOR IN THE SUSTAINABILITY OF MINING WORKERS KW personal protective equipment KW coal mines KW potash mines KW working conditions KW gas KW dust JO MOSCOW ECONOMIC JOURNAL AU Zemskov, A.N. AU Shvayba, D.N. PY 2025 IS 10 PB Electronic science