Acid and metalliferous drainage (AMD/ARD)
Presented at the 1st International Acid and Metalliferous Drainage Workshop in China, this paper briefly discusses the global social, environmental and economic impacts AMD/ARD.
Presented at the 1st International Acid and Metalliferous Drainage Workshop in China, this paper briefly describes the risks of AMD/ARD within a mining context.
This paper discusses the solubility and dissolution characteristics of specialized calcium-enriched caustic magnesia (MgO) materials which makes them ideal for use as an alkaline amendment in new and existing waste rock covers.
This paper discusses the steps taken to reduce the AMD risks at the Brukunga mine site in southern Australia. Improvements in site water containment and collection, upgrades to treatment facilities and improvements to downstream water quality are discussed.
This paper investigates the stability of a range of AMD treatment sludges. The stability of the sludges and their susceptibility to leaching under certain conditions is related to their inherent neutralizing potential.
This paper explains the concept of acidity and acidity load before summarizing the range of available treatment technologies. Also discussed at some depth is the difference between passive and active systems along with examples of each outlining their benefits and limitations.
This paper focuses on the various passive and active treatment alternatives, examining their strengths, weaknesses and suitability for particular applications. The paper provides a starting point for selecting an appropriate technology to meet specific treatment requirements and goals.
This paper discusses a new approach to stabilize sulphide minerals, thereby reducing pollutant loads, from underground mines. The approach uses a low cost technology to manipulate the atmosphere in mine voids displacing oxygen with a reducing gas mixture, thereby reducing sulphide oxidation and acid generation rates.
Using case studies from the Asia-Pacific, this paper reviews and evaluates a range of established techniques, recent advances and new concepts developed for the control and management of acid drainage from mine sites. It identifies the strengths and weaknesses of different approaches and highlights where each can be most cost effectively and successfully used. It also reviews some areas of continuing research into cost-effective techniques for minimising or avoiding acid drainage formation, techniques that offer hope for expanding the future options of environmental managers.
From Concept to Best Practice – Innovations in AMD Prevention and Management (2008)
This paper reviews a wide range of technologies for combating acidic and metalliferous drainage (AMD), spanning characterization, prevention, mitigation and treatment.
Rehabilitation of a Highly Sulfidic Tailings Dam in South-eastern Australia (2008)
The paper discusses the rehabilitation strategies used to address short and long-term environmental issues at an abandoned mine site. The key objective was to minimise oxidation of the tailings, and therefore AMD generation, by establishing a water cover and self-sustaining passive treatment system.
Nutrient control and algal blooms (AMD)
Phosphorous release from bottom sediments in lakes has been identified as a primary source of nutrients for the growth of algal blooms. This paper examines the effectiveness of three forms of calcium carbonate (CaCO3) as barriers against phosphorus release from bottom sediments.
This paper examines the performance of a low-cost, portable Neutra-Mill Water Treatment System (the Turbidity Mill) during treatment of small town drinking water supplies. A single portable Turbidity Mill was effective at reducing the suspended solids in small drinking water reservoirs at several towns.
Presented at the 1st International Acid and Metalliferous Drainage Workshop in China this paper discusses the oxygen consumption (OxCon) testwork techniques along with key benefits.
A key component of understanding and managing the acid metalliferous drainage (AMD), or acid mine drainage (ARD), risk associated with sulfidic materials involves quantifying their rate of oxidation. This rate is directly proportional to the pollution generation rate from sulfidic materials.
Key advantages of this oxygen consumption (OxCon) testwork are that it is low cost, fast to complete (eg. 1 to 6 weeks depending on sulfide content), provides a high degree of accuracy, can simulate the full range of oxygen concentrations, it is not influenced by sulfate precipitation or dissolution reactions, permits sensitive control over a broad range of variables moisture content in particular) and can provide typical leachate water chemistry after testwork is complete.
This paper discusses the oxygen consumption (OxCon) testwork and the benefits.