ABSTRACT: Several mining projects are evaluating the use of existing tailings facilities for disposal of fresh tailings due to a trend of reducing new areas impacted by mining activities. New tailings can be placed in old tailings facilities using alternative methods such as sand stack-ing or filtered tailings.
Tailings are a mixture of water, sand, clay and residual bitumen, and are the by-product of the hot water treatment process used to separate the oil from the sand and the clay. Tailings are stored in large engineered dam and dyke systems called tailings ponds.
Generally, the coarser, sand-size fractions of mill tailings can also be considered for use as coarse aggregates provided there are no harmful or reactive chemical components concentrated from the host rock and the tailings can satisfy the conventional paving aggregate requirements.
The original rock tailings manufacturing sand contains many course particles with a worse grain gradation, but when we add fine sand in an appropriate proportion, its gradation can get an improvement so that it can be used to produce concrete.
The name Syncrude Tailings Dam often refers to the Mildred Lake Settling Basin (MLSB). ... The facility was designed to provide coarse tailings sand storage, returning water and thin fine tailings to other sites within the Mildred Lake Project area. The crest elevation is 400 m or 390 m.
Several mining projects are evaluating the use of existing tailings facilities for disposal of fresh tailings due to a trend of reducing new areas impacted by mining activities. New tailings can be placed in old tailings facilities using alternative methods such as sand stacking or filtered tailings.
The waste came from a "tailings pond," an open-air pit that mines use to store the leftovers of mining things like gold, copper, and, perhaps most notably in Canada, the tar sands—the oil-laden ...
The tailings containment structures are some of the largest man made features on the planet. Dry stackable tailings technology is one way to reduce the volume of the accumulated fluid fine tailings. Dry stackable tailings implementation will allow for reclamation of the boreal forest, and reduce the water requirement from the Athabasca river.
Produce NST (Non-Segregating Tailings): The NST process is identical to the CT process except a thickener is used to produce a fines feedstock. Thickened tailings and coarse sand are mixed to obtain the correct sand-to-fines ratio. MFT can also be added if desired. A coagulant is added to prevent the mixture from separating.
The use of rock tailings sand instead of natural sand in ready mix concrete production, not only can alleviate the processing problem of stone tailings, but also can help to solve the shortage problems of natural sand, which is beneficial to make full use of existing resources and to realize a win-win situation between environmental protection ...
The tailings system included a 3.5 km open channel launder, a two-stage hydrocyclone station. Sand is distributed by a spray bar system on a jacking header to allow continuous dam construction. Excess sand is deposited at the dam toe for future use.
Oil sand tailings have proven to be among the most difficult to dewater, given the very fine particles, presence of oil residues and thickness of deposits. Challenges faced with the filtration of tailing slurries.
Tailings dams that do not use peripheral discharge, but simply dump the sand at the high side of the tailing area or are impounding slimes only, would normally be …
The by-product of this process is a mixture of water, clay, sand and residual bitumen. This material is sent to a tailings pond, where the sand and clays begin to settle out, allowing the process water to be recycled and used again in the mining operation.
Tailings ponds are lined with compacted sand and a layer of fine clay. The clay has a low permeability rate which helps prevent tailings water from seeping into the groundwater. Vertical pumping wells are installed around the perimeter of the tailings dyke (or dam).
The waste from this process is 15.6 tons of tailings with an average composition of 70–80% water, 20–30% sand, silt, and clay, and 1–3% residual bitumen. These tailings are typically stored in tailings ponds retained by perimeter dykes constructed from the relatively coarser fraction of tailings.
Tailings do not have to be stored in ponds or sent as slurries into oceans, rivers or streams. There is a growing use of the practice of dewatering tailings using vacuum or pressure filters so the tailings …
Tailings ponds are settling ponds that contain the waste byproduct of oil sands extraction and upgrading. They are a mix of water, sand, silt, clay, unrecovered hydrocarbons, and other contaminants.
Oil sands tailings ponds are engineered dam and dyke systems used to capture oil sand tailings. Oil sand tailings contain a mixture of salts, suspended solids and other dissolvable chemical compounds such as acids, benzene, hydrocarbons residual bitumen, fine silts and water.
Proceedings Tailings and Mine Waste 2011 Vancouver, BC, November 6 to 9, 2011 Sand Tailings Dams: Design, Construction and Operation Sergio Barrera Tailings Deposit Consultant, ARCADIS Chile Luis Valenzuela Dam and Geotechnical Consultant, ARCADIS Chile Jose Campaña Head Geotechnical Dept, ARCADIS Chile Abstract The design of sand tailings ...
Mine tailings are the ore waste of mines, and are typically a mud-like material. Worldwide, the storage and handling of tailings is a major environmental issue. Many tailings are toxic and must be kept perpetualy isolated from the environment.
for use with tailings that contain a relatively low percentage of sand, the dam raises may be added faster than in the upstream or downstream methods, embankment/dam type is not amenable to permanent storage of large volumes of water,
The use of the tailings in the construction of the dams is the most widespread method, due to the lower cost, material availability and constructive ease. In this case, the dams behave as dry stacks, which are structures constructed by the transport and deposition of soil in aqueous medium.
Seepage Control for Tailings Dams by Earle J. Klohn, President, Klohn Leonoff Consultants Ltd., Richmond, British Columbia, Canada 1. INTRODUCTION Seepage control is a critically important aspect in the design, construction, and operation of tailings dams as it ... remainder of the dam raised using sand tailings for dam con ...
Tailings Dam Construction Design of slime is likely to slide and cause the dam to break away. The procedure usually adopted in such cases is to separate the tailing into coarse sand and fines in a classifier, and to use the coarse product to build up the wall ; the remainder of the pulp is discharged into the interior of the dam.
Tailings can be stored below ground in previous worked out voids. The tailings are generally mixed with a binder, usually cement, and then pumped underground to fill voids and help support an underground mine. For example a 'room and pillar' mining operation that uses backfill will be able to extract the insitu pillars containing ore.
Recycling and Utilization of Mine Tailings as Construction Material through Geopolymerization Lianyang Zhang, Ph.D., P.E. Department of Civil Engineering and Engineering Mechanics University of Arizona, Tucson, Arizona U.S. EPA Hardrock Mining Conference 2012: Advancing Solutions for a New Legacy April 3-5, 2012, Denver, Colorado
The Executive Director of Sustainability and Institutional Relations, Luiz Eduardo Osorio, participated on June 7 in the launch of the Vale Quartz Project, an initiative that uses quartz (silica) sand in iron ore mining tailings to replace natural quartz in the production of quartz surfaces, engineered stone products that are an alternative to marble and granite.
Metals mines use a tremendous amount of water in the process of grinding up and separating minerals from ore, and leave behind waste rock that has been reduced to the consistency of sand, which is ...
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