技术报告-尾矿库设计及评估 (英文)(12)

underground backfilling requires tailings that have a high permeability, low compressibility, and the ability to

rapidly dewater (i.e., a large sand fraction). As a result, only the sand fraction of whole tailings is generally

used as backfill. Whole tailings may be cycloned to separate out the coarse sand fraction for backfilling,

leaving only the slimes to be disposed in an impoundment. To increase structural competence, cement may

be added to the sand fraction before backfilling (Environment Canada 1987).

Open-pit backfilling is also practiced, where tailings are deposited into abandoned pits or portions of active

pits. The Pinto Valley tailings reprocessing operation, located in Arizona, uses this method to dispose of

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