1 edition of Demonstration and evaluation of five methods of secondary backfilling of strip-mine areas. found in the catalog.
Demonstration and evaluation of five methods of secondary backfilling of strip-mine areas.
Demonstration and evaluation of different methods of backfilling strip mined areas.
|Series||Report of investigations (United States. Bureau of Mines) -- 6772|
|Contributions||Griffith, F. E., Magnuson, M. O., Kimball, R. L.|
|The Physical Object|
|Pagination||p. 1-17 :|
|Number of Pages||17|
1/4 inch C. Suitable Backfill Material: Backfill material shall be clean and free from all organic material, clay, marl or unstable materials, debris, lumps, or broken paving. No rocks or stones larger than 6 inches in diameter s hall be allowed in any backfill. Material for backfill File Size: 38KB. Chapter Evaluation of geotechnical classification techniques to design coal mine roofs Introduction Rock mass classification systems have constituted an integral part of empirical mine design for over years, Ritter (). The use of such systems can .
reduction pathways. The relative importance of this secondary oxidation pathway is difficult to quantify. Overall, results of the literature review and drainage chemistry analysis suggest that. 3. NO has the potential to influence Se behaviour in coal mine environments, although the scale and magnitude of such influences Size: 1MB. Mining with Backfill Posted by Matrix on 23rd June The 9th international Symposium on mining with backfill, Minefill will be held April 29 to May 2, at the Palais des Congrès de Montréal, Convention Centre in downtown Montreal, Quebec, Canada.
Geotechnical Considerations in Open Pit Mines Version Department of Minerals and Energy Page 5 of 49 General penalty The penalty for contravention of a provision of these regulations that refers to this regulation is-(a) in the case of an individual. $5 ; and (b) in the case of a corporation, $25 File Size: KB. Occasionally it is put to use as underground backfill for mined out areas. • Waste Rock: Mostly country rock extracted in developing access to the reefs. These rocks do not enter the metallurgical works and are usually disposed of in large rock dumps. Geology and Mineralogy of the Witwatersrand gold fields.
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A Review of Underground Mine Backfilling Methods with Emphasis On Rock backfill method is an economical back filling method which is feasible and applicable in and mining areas with. Paterson & Cooke. Cyclone Testing and Evaluation.
The ability to modify the size distribution of a tailings stream to optimise backfill performance, either for hydraulic or paste fills is an opportunity not to be overlooked when evaluating a materials’ performance as a Size: 2MB. In cut-and-fill methods, blasthole stoping with delayed backfill is a method that can be applied to ore bodies that are generally tabular and vertical or near vertical.
The rock quality of both the ore and the waste needs to be fair to good. Cemented fill for the primary stopes is required when a primary/secondary plan is : Jian Deng. Backfilling Techniques and Materials in Underground Excavations: placement methods and materials that have been Of particular interest in backfilling is re-evaluation of materials and methods that have been given less attention than the clay and aggregate.
The choice of backfilling method is not only site specific, but project specific. Often project constraints such as timeline, cash flows and regional skills impact the choice of backfill method, as they rightfully should. The best method allows for the highest ore recovery at the quickest cycle time for the lowest cost; all while.
Suitable for mechanized cut and fill or avoca or other method where structural backfill is not required. Cemented Rockfill Generally consist of waste rock mixed with a cement slurry to improve the bond strength between the rock fragments. K-UTEC AG Salt Technologies Sondershausen Backfilling and Pillar Re-Mining in Potash Industry C:\Users\Fliss\Daten-Fl\40 Präsentationen\ K-UTEC Präsentationen\ Minefill \paper_kutec_minefill / Page 2 of 14 The first backfilling activities based on excavated rock salt from so called “Bergemühlen” as a bulk.
was the backfilling of shafts №1 and №2, and grouting of adjacent fractured rock through vertical directional boreholes, drilled from the surface around these shafts, (See Fig.1). Principal grouting data for backfilling the underground voids and two vertical shafts of File Size: KB.
Economical Evaluation. The cost of backfill is generally not a major cost to the entire mining process, depending on the type of backfill method being used. The costs can be expressed in either dollars per tonne of backfill or tonne of ore.
The cost ranges from % and % of the total mining cost. find areas where shafts are all abandoned or in contrary still active. some problems linked to deterioration of the sealing structure at the shaft head, or movement of backfilling material in the shaft have been observed.
It is also common to find mine shaft opened even decades after method for enhancing mine works safety, and File Size: 1MB. Get this from a library. Demonstration and evaluation of five methods of secondary backfilling of strip-mine areas. [F E Griffith; R L Kimball; M O Magnuson; Pennsylvania.
Department of Mines and Mineral Industries.; Pennsylvania. Department of Forests and Waters.; United States. Bureau of Mines,]. ISBN: 12th International Conference on Mining with Backfill Denver, Colorado, USA 19 - 22 February Backfill material is engineered to withstand the exposed height of the primary stope it occupies when adjacent secondary stope is being mined, thus avoiding dilution of precious ore which may result from backfill failure into the secondary stope.
Thus, backfilling is one of the most critical tasks for sublevel stoping mining systems with Cited by: 1. Backfilling and subaqueous disposal technology is applicable to the following situations: • solid mining waste or MIW • can treat high volumes of material • remote or rural areas • can treat most contaminants of concern • can be used solo or in conjunction with other technologies.
The coordinates are given in the Swedish coordinate reference system RT90 gon V. c Cross section of open pit 1 showing the backfilling and sealing process completed in – The dry cover consists of m clayey till (the sealing layer) overlain by m unsorted till (the protective layer)Cited by: 7.
properties, backfilling 1naterials tnay be divided into four types: 1. in the initial phase, rninc areas \vere backfilled with gangue produced during ore excavation. The technology available at the tin1e did not allcnv for the profitable exploitation of n1ineral ore \Vith lo\v Hg content (~>). Secondary Mining Method Underhand cut-and-fill.
Information. Paste backfill is used with an 8% cement ratio. The backfill is done by sections of a maximum length of 61 m ( ft) in the following sequence: Clean the floor of all remaining ore. Install the backfill pipe to the back. testing. Density requirements for backfill outside the 8 foot dimension shall not be less than 90 percent maximum density as determined by AASHTO T Testing in these areas may be waived if the County Engineer's representative determines that the backfill is being placed properly and approves waiving the testing requirements.
APA Citation. Griffith, Franklin E., Kimball, Robert on, Malcolm O. () Demonstration and evaluation of five methods of secondary backfilling of strip-mine areas[Washington, D.C.]: U.S.
Dept. of the Interior, Bureau of Mines, MLA Citation. These citations may not conform precisely to your selected citation style.
Waste materials used as backfill material include waste development rock, deslimed and whole mill tailings, quarried and crushed aggregate, and metallurgical process tailings (like slag). Small amounts of cement or other pozzolanic binders are added to the waste material to improve the strength properties of the backfilled by:.
1. Introduction. Backfill is increasingly used in underground mines around the world. There are many environmental and economical benefits associated with underground backfilling for the mining industry.Nonetheless, the primary objective of stopes backfilling is to provide a safe working space for miners and to increase mineral recovery by reducing ore dilution.Cited by: and processing and certain secondary waste materials from the industry can be used to produce waste material composites (WMC)4,5 for backfilling.
Composites for backfilling must consist of those types of waste materials which have no detrimental effect on the environment, which must be proven using verified procedures and methods. This.Paste BackfillPaste Backfill ¾Cost – $43 cy ¾Strength – kPa (70psi) to 2MPa ( psi) ¾4 wt% cementing materials ¾Slump variable between 1” and 10” with very little change in water content (or strength) ¾Max pumpable radius in rubble 10m (30ft) ¾Max pumpable distance in tunnels m (ft) or more ¾Uses locally derived materials.