Due to its significant environmental (Aldhafeeri and Fall 2016), technical (Suazo et al. 2016a) and economic (Cui and Fall 2015a) benefits, cemented paste backfill (CPB; a cementitious material made of unclassified tailings (fine man-made aggregates), hydraulic binders, and water) has been widely applied in underground mines (Suazo et al. 2016b).
Dams holding mining waste, known as "tailings", commonly have walls made of a mixture of sand-like particles and clay-like silt.
The CLSM made only with tailings satisfied the 'Treatment Standard for Hazardous Wastes' in the Code of Federal Regulations of US governments (40 CFR 268.40), whereas that with both tailings and pond ash did not.
But some opponents question that too, noting that right now the price of gold hovers around $1,700 an ounce, making even the tailings left behind by past mining efforts valuable.
With the objective of reducing the negative impacts on environment and utilizing the secondary resource of tailings, the possibility of making construction bricks by using the hematite tailings from western Hubei province of China was investigated.
Tailings dams are made up of mining residue deposits, and they represent a high risk, in terms of mechanical instability.
It is made usually from mill tailings mingled with a small amount of binder (customarily Portland cement) and water.
The conventional rehabilitation of tailings involves the placement of a soil cover on the tailings surface, which may have limited bearing capacity, making placement of the cover problematic.
And so, over the course of three days, 9,000 tonnes of tailings and soil were removed.
The ski trails cross piles of tailings and wind past old trestles and mine shafts.
