Copper mine tailings are the residual products after the purification of precious copper from copper ores, and their storage can create numerous environmental problems. Many researchers have used copper mine tailings for preparation of geopolymer. This paper studies the enhancement of the cementitious activity of copper mine tailings in geopolymer system. First, copper mine tailings are activat...

The Lemoine tailings of Chibougamau, Quebec, Canada, were deposited as a pH-neutral mineral conglomerate consisting of aluminum-silicates, iron-aluminum-silicates, pyrite, chalcopyrite, and sphalerite. These tailings are colonized by an active population of Thiobacillus ferrooxidans which is localized to an acid zone occupying 40% of the tailings' surface. This population peaked at 7 x 10 most ...

Oil sands process-affected water (OSPW), produced by surface-mining of oil sands in Canada, is alkaline and contains high concentrations of salts, metals, naphthenic acids, and polycyclic aromatic compounds (PAHs). Residual hydrocarbon biodegradation occurs naturally, but little is known about the hydrocarbon-degrading microbial communities present in OSPW. In this study, aerobic oxidation of b...

Numerical simulations of the Fault Lake Tailings were conducted to assess the long-term impact of AMD-generation on downgradient receptors. The effects of impoundment geometry, contrasting permeability, water content, and mineralogy of tailings and native sediments were considered. Simulation results suggest that over a time period of 1,000 years only the top three meters of tailings become oxi...

To summarize evidence discussed elsewhere in this volume, past climate change can be detected on time scales of decades to hundreds of millions of years. Theories as to the causes for such changes extend back almost as far as the observations. James Croll (1867) was the first to seriously examine the role 164 CLIMATE CHANGE, CAUSES

After long-term accumulation, weathering and rainfall of metals non-metals in tailings ponds, the chemical composition will change, surface heavy may gradually migrate to bottom layer, thus showing a cumulative effect. At present, distribution cyanide vertical space has not been reported. In this work, 12 sampling points were arranged for pond by grid method Jilin, China. The contents determine...

Dispersed clay particles in mine tailings and soft sediments remain suspended for decades, hindering consolidation and challenging effective management of these aqueous slurries. Current geotechnical engineering models of self-weight consolidation of tailings do not consider microbial contribution to sediment behavior, however, here we show that microorganisms indigenous to oil sands tailings c...

A time-scale varying finite difference method (TSFDM) was proposed to analyze the influence of rainfall infiltration and water level fluctuation on stability a bank slope in Yunnan Pulang tailings pond. The obtained by TSFDM limit equilibrium (LEM) were compared. result indicates that can obtain reliable spatiotemporal variation features geotechnical parameters under different conditions. has g...