Paste Backfill
nounPronunciation: /peɪst ˈbækfɪl/
A mixture of fine tailings, binder (cement or slag), and minimal water that is pumped into mined voids to provide structural support and reduce surface subsidence. This technique immobilizes tailings while creating a stable foundation.
Plain English
Thickened mine waste mixed with cement that fills underground voids to prevent ground collapse and stabilize tailings.
Etymology & History
Usage
"The reclamation plan for the underground gold mine utilized paste backfill to stabilize abandoned stopes and eliminate subsidence risk."
Style guide notes: Specify binder type and solids concentration when describing paste backfill compositions.
Also known as
Contrasted with
Related Terms
Frequently Asked Questions
What is the difference between paste and slurry backfill?
Paste backfill contains less water and higher solids concentration, providing better structural strength than slurry.
Why use paste backfill in reclamation?
Reduces subsidence risk, immobilizes tailings, minimizes water use, and creates stable underground support structures.
Why Test Candidates on This?
Important for understanding underground mine closure methods and waste immobilization strategies.
Required skill level: Mid