 | This article relies largely or entirely on a single source. (March 2017) |
Underground soft-rock mining is a group of underground mining techniques used to extract coal, oil shale, potash, and other minerals or geological materials from sedimentary ("soft") rocks.[1] Because deposits in sedimentary rocks are commonly layered and relatively less hard, the mining methods used differ from those used to mine deposits in igneous or metamorphic rocks (see underground hard-rock mining). Underground mining techniques also differ greatly from those of surface mining.
- ^ Peter Darling, ed. (2011). SME Mining Engineering Handbook (3rd ed.). Society for Mining, Metallurgy, and Exploration. p. 377. ISBN 978-0-87335-264-2.