| The remnant ore inside the old stopes, pillars and tailings used as backfilling are being leached with mild acid solution. |
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| Then, in the early twentieth century, cleanup crews hauled away the tailings from the gold mine, leaving a depression that created a lake. |
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| The mill produced a lead concentrate, a zinc concentrate, and pyritic tailings. |
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| We've come to the Kennedy Mines Tailing Wheels, which were once these four huge wheels that carried the tailings, or residue, from the mines. |
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| Mine wastes have been generated over the last several centuries of mining, the two primary mining wastes being mine tailings and waste rock. |
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| The lake by the doorway was barely more than a large pond now, heavy and odorous with effluents leached from the tailings by rains. |
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| The decline had partially filled with tailings and other debris while underwater, necessitating significant rehabilitation. |
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| Future generations might actually find our radioactive wastes valuable, just as old mine tailings are a useful source of precious metals today. |
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| Hence, a deep hole dug in these dumps today can yield three-hundred-year-old tailings that contain excellent mineral specimens. |
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| Let all the husks, leaves, escaped grain, and other tailings fall directly behind the combine. |
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| After tooling, cut off mortar tailings with trowel and brush excess mortar burrs and dust from face of brick. |
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| These terra-cotta-colored walls are made of quarry tailings with cement and a little water added. |
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| This could affect threshing efficiency since tailings are returned directly to a combine's rotor or cylinder for rethreshing. |
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| A convenient measure of the sloppiness of a tailings product can be made using the Atterberg Liquid Limit Apparatus. |
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| The current proposal is to use this mullock for road construction on top of the Powers Gully tailings dumps. |
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| Thus, the present invention advantageously avoids the production of tailings sludges caused by clay dispersion. |
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| The uranium tailings damage the lining of the lung and increase the risk of developing cancer when breathed in. |
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| We have to squeeze out the water in the tailings, and when this water comes out it is not in ideal condition sometimes. |
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| Suncor has led the research drive into new technologies to improve tailings reclamation. |
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| Surface water runs downslope from the waste rock pile, through the tailings and collects in this pond. |
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| I knew that in the early days of mining, pyromorphite and wulfenite were of no commercial value, so I had hopes of finding specimens in the tailings at Loudville. |
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| Changes in vegetation cover during a three-year period over a section of the Copper Cliff tailings impoundment. |
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| Much of the pollution comes from mine tailings, or residues. |
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| A number of surficial materials, from natural soils to tailings to mine rock, are present in various areas across the site. |
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| Final sub-aqueous tailings placement within the mined-out JEB pit for long-term, secure containment in a belowground facility. |
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| Aluminium dross tailings were used to produce two types of alums. |
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| This would have turned several Andean lakes into reservoirs or tailings ponds. |
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| Overhead, a fox squirrel chattered and nut tailings fell into my hair. |
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| But they present exactly the same problems as tailings dams resulting from mining operations. |
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| This technology has the potential to significantly reduce water use and the size of tailings ponds with the production of dry stackable tailings. |
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| It allowed that healthy lake to become a tailings pond for a mining company. |
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| In 2007, a new tailings pond was built and equipped with state of the art monitoring equipment. |
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| These thickened tailings will be placed in thin layers and allowed to dry into a solid state. |
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| Of these 100 units, 74 are recycled, and 26 are entrained in tailings, which makes them very difficult to get rid of under normal circumstances. |
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| Currently the lowest cost reclamation option is the long tern storage of the mature fine tailings under a water cap in an end pit lake. |
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| This can increase the acidity of the water surrounding the rock or tailings and dissolving lead and other metals. |
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| We had a thickener of tailings, a carbon dioxide injection to produce thickened tailings or, in our case, non-segregating tailings. |
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| The tailings are monitored and managed in facilities, such as engineered tailing ponds or placed back in mined-out open pits. |
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| In the paste tailings plant, the fine solids are flocculated and settle in a high-capacity thickener. |
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| They started implementing consolidated tailings, adding some gypsum and so on to it to make it more trafficable and get the water out quickly. |
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| Subaqueous tremie placement of the thickened tailings below a water cover in the pit from a floating barge. |
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| In plain language, if a pond is going to be used to store tailings, then companies need to compensate by recreating the lost habitat. |
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| Chemical pollution in the Western United States is primarily caused by the leaching of mill tailings and refuse piles associated with various mining activities, including subsurface mining. |
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| Key issues relate to acid rock waste management and the footprint impacts of the tailings impoundments areas on fisheries resources. |
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| Elders visited the site in September to assess the fence and the tailings containment area, and to discuss plans for the taking down the fence. |
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| Examples of this are mine tailings and excavation of acid rock through highway construction. |
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| Artificial impoundments may use large areas of land and often require dams be built to contain the water needed to submerge the tailings. |
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| In addition to tailings from the milling process, uranium production results in large volumes of waste rock being removed before miners can access and mine the ore. |
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| That's a much tighter timeframe than we saw with Suncor's Pond 1, which is on track to mark a milestone in 2010 by becoming the first trafficable oil sands tailings pond with progressive surface reclamation underway. |
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| The Panel believes that it is imperative to produce high-quality CT consistently to ensure that the objective of a trafficable landscape that allows rapid progressive reclamation of tailings areas can be met. |
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| In the 1990s, we pioneered consolidated tailings technology to help speed up the consolidation of MFT into a soil-like deposit that can be re-vegetated and reclaimed. |
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| The Department's role in this research is the measurement of oil sands acids and development of the use of wetland plants to help dewater consolidated tailings. |
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| These tailings offer an interes ting alternative to proceed to a massive sequestration of CO2 which is emitted by unpunctual sources, such as automotive pollution. |
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| Upon final decommissioning and return to normal hydro-geologic conditions, groundwater will flow preferentially through the pervious surround rather than the low permeability tailings. |
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| The sulphide ore at Ok Tedi produces tailings that acidify when they contact oxygen and water in the environment and can potentially result in the release of metals that can in turn affect plants and animals. |
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| For example, if technological advances make it economic to reprocess uranium tailings, the tailings would be considered similar to a uranium ore deposit instead of a waste, and regulated accordingly. |
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| At the heart of this issue is the tailings ponds that have been discussed at length today, the seepage from those tailings ponds and its impact on the health of downstream communities such as Fort Chipewyan. |
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| To date, a water-treatment plant and a new tailings impoundment have been built, and the exposed tailings areas are being dredged and deposited in the new impoundment. |
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| Some of these gases-such as methane, when it starts to be generated in the tailings ponds-actually help densification, so the tailings settle faster. |
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| The companies estimates that around 80 million tons of tailing will be produced each year, and hope to construct a dam where the tailings can be contained and allowed to percolate down into the soil without runoff. |
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| First of all, the statement, if I can just say it again, is that the lack of science at the beginning caused the situation where there was underestimation of the size required for the tailings ponds. |
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| This natural permeable zone allows for subaqueous placement of tailings, which has advantages in terms of radiation protection and prevention of ice formation with the tailing mass. |
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| Rio Algom explained that the dam will have a wide overflow spillway channel, will be designed and constructed to the same standards as all of Rio Algom's other tailings dams, and will be inspected monthly and annually. |
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| When in contact with oxygen and water, the reactive sulphides in tailings and waste rock oxidize and generate an acidic leachate that can carry heavy metals and dissolved salt. |
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| All tailings from the leach plant have also been leached of all constituents that are soluble in sulfurous acid, and upon neutralization, there are no remaining soluble constituents. |
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| In October of 2005, spills from the mine's tailings dam poisoned local water sources, leading to skin disease, water scarcity and killing of the fish that were the livelihood of the local villagers. |
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| However, an unknown quantity of tailings remains in seeps and streams. |
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| The survey showed that tailings are in deep pockets in the lakebed in the area around Port Radium, and researchers think tailings in these locations will not be disturbed. |
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| After mining and tailings placement, all of the land will be reclaimed in a process that involves significant land form creations and contouring followed by topsoil replacement, seeding, fertilizing and tree planting. |
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| As part of the Environmental Management Plan, a Contingency Plan should be prepared to deal with emergencies such as explosions, fires, flash-floods, landslips, major spills, seepages and collapse of tailings dam walls. |
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| In addition, both developed and developing countries generate vast quantities of construction and demolition debris, industrial effluent, mine tailings, sewage residue and agricultural waste. |
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| From my own experience, the first tailings dams I ever saw were in Derbyshire in the north of England, and they were the result of the mining of fluorospa, not a metal as any chemistry teacher will tell you. |
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| The numerical model was not able to match precisely the rate of solute expulsion from the tailings at early time, but achieved a very good match at later time. |
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| In some cases tailings can be reprocessed to recover remaining gold. |
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| But directly related to that is the issue of tailings ponds. |
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| We'll give you a feed stream, which is our tailings, you process it, and what we want back from you is a spec product that we can go ahead and tie into our pipeline going to the upgrader. |
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| For oilsands, enhancing the efficiency of water use is by far the most attractive as it reduces withdrawals at the same time as reducing the amount of water stored in tailings. |
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| The rate at which tracer was expelled from the tailings peaked at the start of each experiment, and then fell off towards some steady-state value. |
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| Management of waste rock and tailings from uranium mining activities are two aspects of the industry that have considerably evolved to minimize risks to the environment. |
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| Uranium mill tailings typically also contain chemically hazardous heavy metal such as lead and arsenic. |
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| Vast mounds of uranium mill tailings are left at many old mining sites, especially in Colorado, New Mexico, and Utah. |
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| Leftover waste from proccessing the ore is called tailings, and is generally in the form of a slurrey. |
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| This is pumped to a tailings dam or settling pond, where the water is reused or evaporated. |
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| Slurry tailings ponds are by far the major type of containment facilities for slurry tailings. |
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| Companies from around the world have come to see how we've revegetated the surface of the tailings and what sort of amendments did we need to do. |
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| The event also marked the one-year anniversary of Wapisiw Lookout, the world's first oil sands tailings pond to be revegetated and reclaimed. |
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| Nitrogen fixation associated with rhizosheaths of Indian ricegrass used in the stabilization of Slick Rock, Colorado, tailings pile. |
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| Runoff from mines or mine tailings can produce some very low pH values. |
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| Uranium tailings contain radioactive and toxic materials, which if improperly stored, are potentially dangerous to humans and can contaminate rivers and lakes. |
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| This month's issue features a look at the unique bioleaching process that cleans mine tailings while recovering the precious resources left behind. |
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