How are tailings dams made?
How are tailings dams made?
An upstream tailings dam consists of trapezoidal embankments being constructed on top but toe to crest of another, moving the crest further upstream. This creates a relatively flat downstream side and a jagged upstream side which is supported by tailings slurry in the impoundment.
How many types of tailings dams are there?
There are three main types of tailings dams: upstream, downstream and centreline.
What is the definition of tailing?
Definition of tailing 1 : residue separated in the preparation of various products (such as grain or ores) —usually used in plural. 2 : the part of a projecting stone or brick inserted in a wall.
What is tailing dam failure?
Tedi tailing dam failure is a human consequence of the discharge of about 2 billion tons of untreated polluted mining waste/slurry into the River system ranking it one of the worst human environmental disaster.
What is tailings dam failure?
On the 22nd February 1994 the Merriespruit tailings dam failed by overtopping as a consequence of heavy rains causing a flowslide (static liquefaction) of part of the embankment (Davies 2002). Small slips had caused the impoundment to close temporarily, and only mine water with small amounts of tailings were deposited.
What is peak tailing?
Peak tailing is the most common chromatographic peak shape distortion. Peak tailing occurs when the peak asymmetry factor (As) is greater than 1.2 — although peaks with As greater than 1.5 are acceptable for many assays.
How are tailings stored?
Tailings are generally stored on the surface either within retaining structures or in the form of piles (dry stacks) but can also be stored underground in mined out voids by a process commonly referred to as backfill.
Why are tailing dams unsafe?
The storage of tailings under water can effectively hinder the chemical reactions that they undergo. However, tailings dams frequently fail, resulting in the discharge of significant quantities of tailings into the natural environment, thereby causing grievous casualties and serious economic losses.
What is a good tailing factor?
0.9 – 1.2
Acceptable Tailing A new column is considered acceptable if the As value is 0.9 – 1.2 (0.9 indicates slight fronting). In practical terms, an As value below 1.5 is usually OK to work with, and up to As = 2.0 may be acceptable depending on the separation and resolution of the peaks.
What is a “tailings dam?
These Guidelines use the term “Tailings Dam” to represent the structure built to contain the tailings as well as the tailings stored. The scope of the Guidelines does not extend to all aspects of the Tailings Storage Facility (TSF) which may include a range of associated structures and infrastructure.
What are the dam management guidelines?
The Guidelines focus on the dam structure and the management of tailings and water within the storage. The Guidelines do not provide detailed guidance on tailings distribution or water management infrastructure. 1.3 Past Lessons Learnt
What is the scope of the Tailings Storage Facility Guidelines?
The scope of the Guidelines does not extend to all aspects of the Tailings Storage Facility (TSF) which may include a range of associated structures and infrastructure. The Guidelines focus on the dam structure and the management of tailings and water within the storage.
Why support ANCOLD’s contribution to tailings dams?
ANCOLD is pleased to make this contribution towards safe and cost-effective tailings dams. The work is the result of the Tailings Dam Sub-committee of ANCOLD and I take this opportunity to thank these members for the unselfish contribution of their time and experience.
