Acid mine drainage remediation options: a review D. Barrie Johnson*, Kevin B. Hallberg School of Biological Sciences, University of Wales, Bangor LL57 2UW, UK Abstract Acid mine drainage (AMD) causes environmental pollution that affects many countries having historic or current mining industries.
Water flowing through active or abandoned mine sites can become polluted by the material being mined. By far the most common mine drainage problem is that of acid mine drainage (AMD). Sulfuric acid is produced when water interacts with sulfur-bearing materials in the presence of oxygen and common bacteria. The acidic water formed by this process can dissolve many metals
Mar 18, 2021· The proposed research will evaluate a novel agent for its potential to: (1) control acid rock drainage (ARD) at its source, and (2) stop ARD once it starts. The agent in low concentrations is a potent toxicant to acidophilic pyrite-oxidizing bacteria. These bacteria play a major role in the formation of ARD from sulfidic mine tailings.
Performance of the Acid Rock Drainage Mitigation Waste Rock Trial Dump at Grasberg Mine J. Andrina, G. W. Wilson, S. Miller, A. Neale p 30-44. Surface Paste Disposal of High-Sulfide Tailings - Field Cell Monitoring and Pilot Plant Testing R. Verburg, P. Newman, M. Fordham p 2170-2187. Toward Source Control of Acid Rock Drainage
Nov 23, 2018· When it comes in contact with air and water, the waste material can generate acid mine drainage (AMD) or acid rock drainage (ARD) which pollutes the environment. Because these ponds frequently take up part of the natural topography and are retained by large dams, it can have a dramatic effect on the local environment.
Oct 08, 2018· Reduce or prevent acid mine drainage from coal refuse piles and surface mines by inhibiting the growth of acid- causing bacteria. Approach. A dilute surfactant or detergent solution is applied directly to coal refuse piles or overburden using a hydroseeder or road watering truck.
Acid Mine Drainage Environmental Notes on Mining, updated September 2009 Pyrite (FeS2) is commonly associated with coal and metal ore deposits. Its oxidation occurs spontaneously in nature, causing environmental problems like Acid Mine Drainage (AMD) and mine …
KMG•GOLD Waste Rock and Acid Mine Drainage. Tailings and waste rock piles at existing mine sites and abandoned mine sites are evidence of the destruction that mining operations can bring upon the environment. In the past, non-environmentally friendly methods were the method of the day - profit at all costs being the main motivator.
components in tailings which contribute to acid mine drainage Nancucheo and Johnson (2011) investigated whether by (AMD) generation, provides a basis on which to introduce a primary manipulating microbial communities in tailings (inoculating with level of integration into the upstream mineral processing tech- iron- and sulphur-reducing ...
carbonates (Juillot et al., 1999), acid mine drainage (AMD) – also called acid rock drainage – is generated. A worldwide estimate assumes that about 20,000 km of river and 70,000 ha of lake and reservoir areas are seriously damaged by acidic mine effluent (Johnson and Hallberg, 2005). The control and mitigation of AMD
The waste rock/tailings piles considered in this Operable Unit were selected based on their location close to the acid mine discharges. Currently, the major impacts on the water quality of Clear Creek are the Big Five and Argo mine tunnel discharges. The water quality of North Clear Creek is affected by the
The closure and rehabilitation of tailings facilities should be considered early on in their planning, and continuously during operation, since options decrease and costs increase during the mine's life, as highlighted schematically in Figure 25 (taken from the Global Acid Rock Drainage (GARD) Guide ).
Acid mine drainage detrimentally affects thousands of surface watercourses throughout the world and costs tens of millions of dollars annually in site remediation expenditures. This process is accelerated by the activity of iron- and sulfur-oxidizing bacteria which grow chemolithotrophically in mine tailings. Low cost, environmentally
Acid rock drainage (ARD) is a significant environmental problem. ARD is caused by chemical and biological processes (i.e., the oxidation of sulfide minerals in mine tailings and waste rock) and characterized by acidic water containing heavy metals.
Apr 02, 2014· Millions of tonnes of sulphide tailings are produced each year from base metal and gold flotation operations. Of these tailings a substantial amount is stored in tailings dams of which an example is shown in Figure 1. These tailings invariably contain sulphides which have potential to cause acid mine drainage (AMD).
Jun 22, 2020· Tailings dam liabilities and falling water resources are strengthening the case for reprocessing and retreating 'waste' sites or streams. ... Cerro Verde Mine Tailings Storage Facility Webinar A global, standard approach to tailings, finally ... Acid Rock Drainage: The Problem with Rates
there is a low risk of acid rock drainage potential from the tailings. Kinetic testing results have been reported for 32 weeks as of the date of this report. Results support the assessment that ARD is not expected from the tailings and leaching will be under neutral to alkaline conditions.
Sulfide Mineral Coating Process To Control Acid Rock Drainage EPA Contract Number: EPD04057 Title: Sulfide Mineral Coating Process To Control Acid Rock Drainage Investigators: Olson, Gregory J. Small Business: Little Bear Laboratories Inc. EPA Contact: Richards, April Phase: II Project Period: April 1, 2004 through June 30, 2005 Project Amount: $225,000
Figure 1.2 is a conceptual model of acid rock drainage in the Witwatersrand region (Tutu et al., 2008a). The model firstly highlights the main sources of acid rock drainage pollution, which includes active tailings dumps where deposition is occurring currently, tailings undergoing reprocessing, and tailings footprints and secondary sources, e.g.
For example, gangue and tailings from mining heavy metals could have a high concentration of sulfides which could cause acid rock drainage to occur. Due to the many variables, mining operations will need to develop their own methods of waste disposal in accordance with regulations pertaining to the different types of waste they produce.
Sep 16, 2020· However, the average molar ratio of Ca:Fe is 0.3 and of (Ca + Mg): Fe is 1.06, and as 2 mol of divalent cations are required to neutralise the acid produced from 1 mol of pyrite, the Musina mine tailings would be expected to produce some acid drainage and it is puzzling that the measured pH values are neutral to slightly basic. A possible ...
Acid rock drainage (ARD), produced from sulfide-bearing mine waste (e.g., waste rock, tailings) at active and abandoned mine sites, continues to be a global concern due to the significant impacts on water, soil, biodiversity, and the creation of public health risks.
Water flowing through active or abandoned mine sites can become polluted by the material being mined. By far the most common mine drainage problem is that of acid mine drainage (AMD). Sulfuric acid is produced when water interacts with sulfur-bearing materials in the presence of oxygen and common bacteria. The acidic water formed by this process can dissolve many metals in bioavailable ...
Jun 01, 2017· When tailings and waste rock contain sulfidic minerals, acid mine drainage (AMD) may be produced and contaminate the surrounding environment. AMD arises when sulfide minerals are in contact with water and atmospheric oxygen; sulfides oxidize …
tailings pond, spoils piles and remnant mine operations. In the 1950s and 1960s, Commercialores mined the site for kyanite (see text box). During the mining process, waste rock and spoils were dewatered in ponds and piles. Acid mine drainage and acid rock drainage impacted surface areas, surface water and groundwater. Acid mine drainage