TY JOUR TI Real options method in the assessment of mining industry investment KW methods KW investment projects KW economic evaluation KW mining KW mining finance KW mining economics KW mining valuation KW flexible mine design KW flexible mining operations KW flexibility KW real options KW options KW alternatives JO Russian Journal of Management AU Gusev, A.A. AU Narulin, D.. PY 2014 IS 2 PB Publishing Center RIOR