CONTACT US

Our Address

Science Avenue, High-tech Zone, Zhengzhou City, Henan Province, China

  • How to generate value from tailings with reprocessing to ...

    Oct 15, 2019  Whether driven by regulatory compliances, tailings dam failure and water scarcity, mine tailings can well become a strong business case in the near future. Due to growing mining volumes, global tailings generation was estimated to total ~3.2 bn

  • 作者: Rodrigo Gouveia
  • Mine Tailings Disposal Methods

    The methods commonly employed for disposal of these wastes in each of the industry segments (that is, coal mining and metal-ore and non-metal mineral mining) are described below. Mining Coal Tailings Disposal. As has been pointed out earlier in this section, immense quantities of wastes are produced by coal mining activities.

  • Mine Waste Transfer and Disposal Methods - Mine Tailings ...

    Mine Tailings Tailings are finely ground rocks and other mineral waste as a result of mineral processing. Due to the way minerals are processed, tailings can contain concentrations of processing chemicals. This can make mine tailings an environmental concern, so

  • Valuation Methods - Three Main Approaches to Value a Business

    The “comps” valuation method provides an observable value for the business, based on what companies are currently worth. Comps are the most widely used approach, as they are easy to calculate and always current. The logic follows that, if company X trades at a 10-times P/E ratio, and company Y has earnings of $2.50 per share, company Y’s ...

  • Mining Valuation Techniques - P/NAV, P/CF, EV/Resource

    P/NAVP/CFEv/ResourceTacMore Mining valuation ResourcesPrice to net asset value (P/NAV) is the most important mining valuation metric, period.“Net asset value” is the net present value (NPV) or discounted cash flow (DCF) value of all the future cash flowCash FlowCash Flow (CF) is the increase or decrease in the amount of money a business, institution, or individual has. In finance, the term is used to describe the amount of cash (currency) that is generated or consumed in a given tim在corporatefinanceinstitute上查看更多信息
  • Depth-related variability in viral communities in highly ...

    Physicochemical stratification of mine tailings. Both tailings cores showed steep vertical gradients of physicochemical properties (Fig. 1). pH values shifted from extremely acidic at the surface layers to near neutral at the deeper layers, while electronic conductivity (EC) declined with depth along the vertical profiles.Both total organic carbon (TOC) and total phosphorus (TP) exhibited an ...

  • From Tailings to Treasure? Miners Make Money Reprocessing ...

    New technology allows it to recover up to 40% of the gold left in particle form in tailings. DRD Gold extracted 33,600 ounces of gold, worth nearly US$40 million, in the last quarter of 2013. Mintails, a mine tailings processor, has developed new technology to process 350,000 tons of slimes from its extensive tailings resources.

  • Valuation of Mineral Exploration Properties – AMC Consultants

    Given the subjectivity of the valuation methods used for exploration properties, it is not usually sensible to produce values more detailed than the nearest $0.1 million for significant projects or than the nearest $10,000 for lesser projects. The final valuation is an experience-based judgement based on weighting of the individual values.

  • Accounting for tailings dam failures in the valuation of ...

    The value of the mine in this case is obtained by computing (27) using the higher operational costs opex2 and subtracting the higher capital expenditure capex2 from the result. In particular, we assume that dry processing mines have no risk of tailings dam failure. The expected value of the mine in this case is V 0 d r y = $ 6. 49 B (+ 20 %).

  • Life cycle cost estimation and environmental valuation of ...

    The authors used NPV to compare each option for the disposal of coal mine tailings and, subsequently, to determine the most cost-effective strategy for the mine site. 2.2.2. Environmental valuation method 2.2.2.1. Valuation. A mining project evaluation is not only based on its financial profitability but also its sustainable development ...

  • Valuation Definition - Investopedia

    Jun 01, 2020  Valuation is the process of determining the current worth of an asset or a company; there are many techniques used to determine value. An analyst placing a value

  • Evaluation of pyritic mine tailings as a plant growth ...

    The tailings acid/base account was used to predict plant growth limitation by acidity, and thus methods capable of identifying tailings that would acidify to pH 4.5 or lower were sought.

  • Tailing Disposal Methods and Tailings Dam Construction Design

    Tailing Thickeners. In modern practice the first stage of dewatering is generally carried out in a Traction Thickener, which is of the same general design as the machine described in connection with concentrate thickening, except that in the larger sizes of tanks often only the walls and central column are of concrete, the bottom being of tamped earth.

  • Creating value from waste - Canadian Mining ...

    Apr 01, 2020  M aximizing value from waste. W ith progressive technology and a more environment friendly vision, mining companies have been exploring effective waste management methods to handle mine tailings. Driven by both stored mineral value and reclamation, reprocessing offers an interesting proposition for long-term tailings management.

  • Tailings - Wikipedia

    Terminology. Tailings are also called mine dumps, culm dumps, slimes, tails, refuse, leach residue, slickens, or terra-cone (terrikon).. Examples Sulfide minerals. The effluent from the tailings from the mining of sulfidic minerals has been described as "the largest environmental liability of the mining industry". These tailings contain large amounts of pyrite (FeS 2) and Iron(II) sulfide (FeS ...

  • How to manage tailings efficiently and economically - Metso

    Sep 04, 2019  The mining industry has changed significantly over the past years. Because of lower head grades and complex ores, more tailings are generated by mining processes, adversely impacting the ecosystem and the productivity. The recent tailings dam failures have increased the pressure to search for alternatives. Responsible and cost-effective management of tailings are essential to reduce risks

  • Alternative Uses of Tailings Tailings Management Weir ...

    Apr 23, 2019  By utilising tailings as a material with value, as opposed to waste, customers are able to extract ‘treasure from trash’, reducing the need for a whole new mine site to mine those minerals. In the face of new challenges and a changing mining landscape, the collapse of tailings dams demonstrates that safety cannot be compromised and new ...

  • Capturing and generating value from mine tailings GRID ...

    Within the mining and metals industry there is a growing interest in finding value in mine tailings and developing new and innovative ways to reduce and reuse them. The extraction of additional resources provides an opportunity to create value and reduce environmental liability, and is potentially one way the industry can improve sustainability (Golev 2016)

  • From Waste to Value – Resource Estimation for Mine Tailings

    Tailings resulting from former mining activities could become such an alternative source by transforming waste to value. An advantage compared to conventional sources, which often require great ...

  • Treasure from trash: how mining waste can be mined a ...

    Jun 28, 2016  Identifying mine waste materials as economic resources will help support global demand for critical metals, boosting the mining industry during the downturn. All with environmental benefits.

  • A Multiple Accounts Analysis for Tailings Site Management ...

    The voice oF the Canadian Mining Industry Since 1935. Menu. Our Focus. Regulatory Effectiveness; Economic Competitiveness

  • Method for capping mine waste and tailing deposits ...

    Dec 21, 1999  A method for providing a subaerial composite capping cover over sulphide containing tailings and sulphide bearing mine waste materials as claimed in claim 1, wherein the average particle size of said inert, fine substance is between 10 and 120 μm, the hydraulic conductivity of said first particulate layer is less than 10-3 cm/sec, and the ...

  • An engineered cover system for mine tailings using a ...

    Dec 15, 2011  A cover system for mine tailings with a solidified layer (called an engineered hardpan) was developed in this study to reduce water infiltration, acid generation and sulfide oxidation. Hydrated lime and waterglass were used to produce calcium silicate, which can serve as a binder when constructing a hardpan layer.

  • Tailings (Mines and Residue) - GHD

    Being a potentially high-risk asset, TSFs, tailing ponds, dams and residue disposal areas are now considered one of the most important structures on any mine site, with consequences of dam failure ranging from the catastrophic and tragic loss of life, expensive clean-up operations and political consequences that jeopardise company's viability ...

  • A Multiple Accounts Analysis for Tailings Site Management ...

    The voice oF the Canadian Mining Industry Since 1935. Menu. Our Focus. Regulatory Effectiveness; Economic Competitiveness

  • Method for capping mine waste and tailing deposits ...

    Dec 21, 1999  A method for providing a subaerial composite capping cover over sulphide containing tailings and sulphide bearing mine waste materials as claimed in claim 1, wherein the average particle size of said inert, fine substance is between 10 and 120 μm, the hydraulic conductivity of said first particulate layer is less than 10-3 cm/sec, and the ...

  • An engineered cover system for mine tailings using a ...

    Dec 15, 2011  A cover system for mine tailings with a solidified layer (called an engineered hardpan) was developed in this study to reduce water infiltration, acid generation and sulfide oxidation. Hydrated lime and waterglass were used to produce calcium silicate, which can serve as a binder when constructing a hardpan layer.

  • Tailings (Mines and Residue) - GHD

    Being a potentially high-risk asset, TSFs, tailing ponds, dams and residue disposal areas are now considered one of the most important structures on any mine site, with consequences of dam failure ranging from the catastrophic and tragic loss of life, expensive clean-up operations and political consequences that jeopardise company's viability ...

  • NIOSHTIC-2 Publications Search - 20024754 - Evaluation of ...

    Results from tailings B showed the same general trends, but varied significantly in sensitivity to variations. The average yield of the standard TCLP tests as a percentage of the total digestion assay is 20% for tailings A and 10% for tailings B. This is a significant difference between the two types of tailings.

  • Mine Tailings - groundtruthtrekking.org

    Tailings containment facilities are regarded as the world's largest man-made objects. Terminology. Mine tailings' size and composition depends on the mining method. For hardrock metal mines, tailings are usually a very fine mud or powder, which is left over after ore is crushed and valuable minerals are extracted from it.

  • What is Peak Tailing? Chromatography Today

    Either method of measuring tailing can be used – unless it is defined in a method or standard – but note the methods are not interchangeable. Acceptable Tailing. Since most columns exhibit some peak tailing, what is considered an acceptable A s value? A new column is considered acceptable if the A s value is 0.9 - 1.2 (0.9 indicates slight ...

  • Geotechnical Properties of Mine Tailings Journal of ...

    In order to maintain the normal mining operations, several methods are proposed for tailing disposal, including disposal of dry or thickened tailings in impoundments or free-standing piles, backfilling underground mine workings, subaqueous disposal, and the most common method, the disposal of tailings slurry in impoundments that involves the ...

  • Converting Tailings Dumps into Mineral Resources Energy ...

    Knowing the deposition history of a tailings dump and, possibly, past process plant efficiencies, gives an idea of what to expect in terms of mineralogy and metals of interest. Since tailings dumps are mostly mined in bulk and not selectively, the mean value of the grade must be

  • Environmental Risks From Mine Tailings

    Aug 10, 2018  This method cuts down on dust problems, and at least in theory, the impoundments are engineered to let excess water flow out without leaking tailings. Coal ash, while not a type of tailing, is a coal burning by-product stored the same way, and carrying similar environmental risks.

  • Mine Tailings Pumping and Transportation - DAE Pumps

    Feb 28, 2018  Methods of Transporting Tailings. The methods of displacing or transporting mine tailings generally fall into two categories. The first method involves wetting the tailings into a slurry mixture that can be pumped using a slurry pump or gravity to move it down a pipeline system into a tailings pond. Pumping using centrifugal style slurry pumps ...

  • Evaluation of soil intervention values in mine tailings in ...

    The aim of this work is to show a methodological proposal for the analysis of soil intervention values in mine tailings in order to determine the intervention requirements in the commune of Andacollo in northern Chile. The purpose of this analysis is to guide the intervention policies of both private and public organizations. The evaluation method is based on the Dutch legislation.

  • A Review on in Situ Phytoremediation of Mine Tailings

    Thus, the remediation of mine tailings has become a key issue in environmental science and engineering. Phytoremediation, an in situ cost-effective technology, is emerging as the most promising remediation method for mine tailings by introducing tolerant plant species.

  • IMPROVEMENT IN THE STABILIY OF UPSTREAM METHOD

    Keywords: Tailing Dams, Upstream Method Raises, Rock Fills, Dam Stability Introduction Upstream method tailings dams have been used e xtensively in the mining industry in the 20th century with less frequent use in the 21st century. This type of tailings dam typically consists of hydraulic pipe spigot, paddock cell or hydro-

  • New Technologies on Mine Process Tailing Disposal

    surface tailing disposal methods. Even though tailing dams are the most used method for the disposal of mine tailings, they also bring many problems in terms of cost, environment, and human health. It is known that there are approximately 3,500 tailing dams around the world, and 138 important tailing dam accidents in total were D DAVID PUBLISHING

  • A Review on in Situ Phytoremediation of Mine Tailings

    Thus, the remediation of mine tailings has become a key issue in environmental science and engineering. Phytoremediation, an in situ cost-effective technology, is emerging as the most promising remediation method for mine tailings by introducing tolerant plant species.

  • As mineral extraction endangers communities, maybe the ...

    We will use dry stack tailings (“DST”), instead of a tailings dam or pond. DST is widely recognized as the most stable, sustainable method for managing mine tailings and allows rehabilitation ...

  • mine waste and tailings remedial and recycling

    These tailing are stored and handled by various methods such as ponds, dams, dry piled or filled back to where it came. In todays mining operations the storage and handling of tailings is a big issue. The big problem for engineers and mine planners is always the same. Where and how to dispose of tailings.

  • The Economist explains - The danger of tailings dams The ...

    A tailings dam can be constructed by piling up rock and earth to produce an impermeable barrier, a reasonably stable method recommended in areas prone to earthquakes.

  • tailings disposal method

    A comparison of alternative tailings disposal methods — the promises and realities A.H. Watson et al. 500 Mine Waste 2010, Perth, Australia • Paste tailings disposal: involves dewatering the tailings material in specialised paste thickeners, or ultra-high-density thickeners, to

  • Differences between water-retention dams and tailing dams ...

    A conceptual model for calculating the net present value of mine closure. An average day in a large-sized copper mine. Aznalcóllar mine storage facility failure. Capturing and generating value from mine tailings. Causes of tailing dams failures 1915-2016. Climate change and its eff-ect on the stability and lifespan of a tailings dam.

  • Sand washing water and tailings concentration treatment LZZG

    The chemical neutralization method is to use the addition of alkaline substances (such as lime, carbonate rock, etc.) and the mine tailings to pile up and neutralize the reaction, thereby achieving the control of the generation of acid mine wastewater. The tailings are mixed and neutralized to increase the environmental pH value of the mine ...

  • Tailings Solutions for the Future Weir Group

    Jul 03, 2019  Combined with the stringent accountability that mine operators have to local communities, tailings management is now a significant consideration, with processing requirements and technology changing rapidly. Traditionally involved in the pumping of tailings, at Weir Minerals we have extended our expertise into this area to encompass the entire tailings process.

  • Tailings - Wikipedia

    Tailings are the materials left over after the process of separating the valuable fraction from the uneconomic fraction of an ore.Tailings are distinct from overburden, which is the waste rock or other material that overlies an ore or mineral body and is displaced during mining without being processed.. The extraction of minerals from ore can be done two ways: placer mining, which uses water ...

  • Fluid Fine Tailings Management Methods

    Fluid Fine Tailings Management Methods 1 -2 For virtual mine scenarios VM 1 and VM 3 different FFT management methods were individually applied to develop life-cycle costs and predict key environmental impacts. Table 1-1 shows the cases that were developed. Table 1.1 Case Matrix Considered for the Study Fines Management Technology Site Conditions

  • Gold Tailings: Hazards and Opportunities INN

    To prevent this, mining operations use a variety of storage methods to contain toxic tailings, and focus on treating water for contamination, though this process can be costly and resource intensive.

  • Tailingsfo Backfill of Tailings to Underground Workings

    Backfill of Tailings to Underground Workings. Figure 1: Filling of an Underground Stope (© Barrick Gold) Introduction. 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.

  • Twin Metals says it will use dry-stacking method to store ...

    In a release, Jobs for Minnesotans said "the dry stack tailings storage method is the right option to do just that for its specific underground mine project" and celebrated Twin Metals ...