Mining — Mining methods — Classification and specification
NORMA vydaná dňa 4.12.2025
Označenie normy: ISO 21557:2025
Dátum vydania normy: 4.12.2025
Počet strán: 44
Približná hmotnosť: 132 g (0.29 libier)
Krajina: Medzinárodná technická norma
Kategória: Technické normy ISO
Description / Abstract: This document establishes a classification of mining methods based on specification such as ore grade and recovery, cost of infrastructure, ore extraction, labour and machine costs, underground support costs and geotechnical factors.