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Stability of multilayer earthen barriers used to isolate mill tailings: geologic and geotechnological considerations
This report briefly discusses how seismic activity, erosion, climatic change, slope stability, differential settlement, and cover design could affect the long-term integrity of multilayer earthen cover systems. In addition, the report suggests ways to design and construct covers so that adverse impacts can be avoided or minimized. The stability of multilayer earthen barriers used to isolate uranium mill tailings depends on the morphology of the disposal site, the engineering of the barrier, the condition of the tailings, and the possible impacts of earthquakes, erosion, and climatic changes. When designing a cover for or siting a tailings pile, one must take into account both geologic and geotechnological variables. To alleviate the adverse effects of possible seismic activity, tailings piles should never be located on or near active or capable faults. Existing piles near faults should be moved to safer sites or engineered to withstand possible displacement and shaking. Liquefaction generally can be prevented if the tailings and their underlying material are compacted to a relative density of 60% or greater, or if they are kept dry. If the tailings are saturated, dewatering schemes may have to be used. Erosion may be caused by streams, glaciers, or wind, depending on the geomorphic …
Date:
August 1, 1981
Creator:
Zellmer, J.T.
Object Type:
Report
System:
The UNT Digital Library
Uranium recovery research sponsored by the Nuclear Regulatory Commission at Pacific Northwest Laboratory. Quarterly progress report, April-June 1984
Progress is reported on the following studies dealing with mill tailings: long-term stabilization; interim stabilization of mill tailings piles; tailings dewatering techniques; tailings neutralization and other alternatives in immobilizing toxic materials in tailings; evaluation of seepage and leachate transport from tailings disposal facilities; effluent and environmental monitoring methods and equipment and instrument testing; attenuation of radon emissions; assessment of leachate movement from uranium mill tailings; and methods of minimizing ground water contamination in in-situ leach uranium mining. 1 figure.
Date:
August 1, 1984
Creator:
Foley, M. G.; Deutsch, W. J.; Gee, G. W.; Hartley, J. N.; Kalkwarf, D. R.; Fayer, M. J. et al.
Object Type:
Report
System:
The UNT Digital Library
The Rice Thresher (Houston, Tex.), Vol. 86, No. 1, Ed. 1 Friday, August 28, 1998
A weekly student newspaper from the Rice University in Houston, Texas that includes campus news and commentaries along with advertising.
Date:
August 28, 1998
Creator:
Stoler, Brian
Object Type:
Newspaper
System:
The Portal to Texas History
Extracting Metals from Ores
Patent for the extraction of metals from ores by developing an improvement to the cynid process.
Date:
August 20, 1918
Creator:
Biesel, C.
Object Type:
Patent
System:
The Portal to Texas History
Compilation of Data on the Uranium and Equivalent Uranium Content of Samples Analyzed by U.S. Geological Survey During a Program of Sampling Mine, Mill, and Smelter Products
Report discussing the sources of about 1,400 samples of samples of mine, mill, and smelter products that were collected by the U.S. Geological Survey. In addition, the "kind of material sampled, i.e. ores, concentrates, middlings, tailings, flue dusts, and so forth, and the radioactivity of the samples are listed in the report."
Date:
August 1952
Creator:
Hall, M. L. & Butler, A. P., Jr.
Object Type:
Report
System:
The UNT Digital Library
RAW MATERIALS PROCESS TESTING. Progress Report of Engineering Section for March 1956
None
Date:
August 1, 1956
Creator:
Ryon, A.D. & Johnsson, K.O.
Object Type:
Report
System:
The UNT Digital Library
ULTRASONICALLY-ENHANCED DENSE-MEDIUM CYCLONING FOR FINE COAL AND COAL REFUSE IMPOUNDMENT MATERIALS
The Pennsylvania State University, its project team (Typlex, Inc., DAGER, Inc., and PrepTech, Inc.), and advisory committee members have demonstrated the application of ultrasonic energy during dense-medium cyclining and subsequent recovery of fine coal and coal refuse impoundment materials. The results will help to extend the range of conventional dense-medium cyclining to sizes now typically cleaned in relatively inefficient water-only cyclone and spiral concentrators circuits. This technology also provides a potential approach to produce ultra-clean material as would be used for feedstocks for premium carbon products. This report describes Phase I of the project, which involved laboratory testing of dense-medium cyclining and subsequent medium recovery, with and without ultrasonic treatment, along with fundamental dispersion testing. Dense-medium cycloning was conducted with a 76.2-mm (3-in.) diameter cyclone under various conditions including magnetite grade, medium relative density, inlet pressure, cyclone geometry, and feed coal. Dense-medium recovery testing was carried out with a 305-mm (12-in.) diameter x 152-mm (6-in.) wide wet-drum magnetic separator using the cyclone clean coal and refuse products as the feed material. Fundamental testing of dispersion/reagglomeration phenomena was conducted with coal/clay mixtures. In almost all cases, the dense-medium cyclone was capable of achieving separations down to approximately 0.037 mm. Ultrasonic treatment …
Date:
August 1, 2001
Creator:
Klima, Dr. Mark S. & Arnold, Dr. Barbara J.
Object Type:
Report
System:
The UNT Digital Library
The Thresher (Houston, Tex.), Vol. 30, No. 18, Ed. 1 Thursday, August 17, 1944
A weekly student newspaper from the Rice Institute in Houston, Texas that includes campus news and commentaries along with advertising.
Date:
August 17, 1944
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Development of Fixed Screen Resin-In-Pulp Devices
A resin-in-pulp process was developed using a series of fixed-screen or Winchester cells. Various laboratory and pilot plant models were constructed and tested under simulated plant conditions. The fixed-screen device proved very effective in the recovery of uranium and/or vanadium by a continuous, resin-in-pulp process.
Date:
August 5, 1954
Creator:
Charles, W. D.; Thorpe, D. F.; Lower, G. W.; Kaufman, David; Schiff, Norman N.; Abrams, Charles S. et al.
Object Type:
Report
System:
The UNT Digital Library
Gunnison, Colorado subpile study report. Revision 1
To protect human health and the environment, the Uranium Mill Tailings Remedial Action (UMTRA) Project will remediate the uranium mill tailings site at Gunnison Colorado. There are explicit requirements (i.e., 40 CFR Part 192) for the surface remediation of radiologically contaminated soils on UMTRA sites. The removal of subpile sediment to the depth required by 40 CFR Part 192 will leave in place deeper foundation sediment that is contaminated with hazardous constituents other than radium-226 and thorium-230. The Department of Energy and the Colorado Department of Health have questioned whether this contaminated soil could potentially act as a continuing source of ground water contamination even after surface remediation based on 40 CFR Part 192 is complete. To evaluate the subpile sediments as a potential source of ground water contamination, the Gunnison Subpile study was initiated. This report summarizes the results and findings of this study.
Date:
August 1, 1994
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Thresher (Houston, Tex.), Vol. 32, No. 5, Ed. 1 Thursday, August 9, 1945
A weekly student newspaper from the Rice Institute in Houston, Texas that includes campus news and commentaries along with advertising.
Date:
August 9, 1945
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Rice Thresher, Vol. 95, No. 1, Ed. 1 Friday, August 24, 2007
A weekly student newspaper from the Rice University in Houston, Texas that includes campus news and commentaries along with advertising.
Date:
August 24, 2007
Creator:
Bursten, Julia
Object Type:
Newspaper
System:
The Portal to Texas History
Nitric acid leaching of radium and other significant radionuclides from uranium ores and tailings
Nitric acid leaching of representative uranium ores and mill tailings from the western U.S. mining districts removes up to 98% of the /sup 226/Ra and /sup 230/Th, yielding a residue containing 17 to 60 pCi of radium per gram. At best, this is an order of magnitude greater than that in surrounding soils, but about the same level as a standard proposed for building materials in the United Kingdom. Data are also presented on the water penetration and leaching of tailings, the solubility of BaSO/sub 4/, and radon emanation coefficients of ores, tailings, and nitric acid-leached residues.
Date:
August 1, 1977
Creator:
Ryon, A. D.; Hurst, F. J. & Seeley, F. G.
Object Type:
Report
System:
The UNT Digital Library
Apparatus for Separating or Concentrating Ores
Patent for improvements in apparatus for separating or concentrating ores through a flotation method.
Date:
August 31, 1920
Creator:
Cole, David
Object Type:
Patent
System:
The Portal to Texas History
Proceedings of the ocean thermal energy conversion (OTEC) biofouling and corrosion symposium
Separate abstracts were prepared for 39 of the 40 papers presented. One paper was previously included in the data base. (WHK)
Date:
August 1, 1978
Creator:
Gray, R. H.
Object Type:
Article
System:
The UNT Digital Library
Continuous Vacuum Dehydrator.
Patent for improvements in speed, cheapness, and more efficiency in continuous-vacuum dehydration and filtering for the purpose of extracting valuable ores with water including instructions and illustrations.
Date:
August 20, 1918
Creator:
Biesel, Charles
Object Type:
Patent
System:
The Portal to Texas History
Bench-scale testing of the micronized magnetite process. Eighth quarterly technical progress report, April--June, 1996
The major focus of the project is to install and test a 500 lbs./hr. fine-coal cleaning circuit at DOE`s Process Research Facility (PRF), located at the Pittsburgh Energy Technology Center (PETC). The circuit will utilize an extremely fine, micron-sized magnetite media and small diameter cyclones to make efficient density separations on minus-28-Mesh coal. The circuit consists of three subcircuits: Classification Circuit; Dense-Medium Cycloning Circuit; and Magnetite Recovery Circuit. The testing scope involves initial closed-loop testing of each subcircuit to optimize the performance of the equipment in each subcircuit (i.e., Component Testing), followed by open-circuit testing of the entire integrated circuit to optimize the process and quantify the process efficiency (i.e., Integrated Testing). This report contains a short discussion of the project description, objectives, budget, schedule, and teaming arrangement. It also includes a detailed discussion of the above mentioned project accomplishments and plans, organized by the various task series within the project work plan. The final section contains an outline of the specific project goals for the next quarterly reporting period.
Date:
August 13, 1996
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Bench-scale testing of the micronized magnetite process. Seventh quarterly technical progress report, January--March, 1996
The major focus of the project is to install and test a 500 lbs./hr. fine-coal cleaning circuit at DOE`s Process Research Facility (PRF), located at the Pittsburgh Energy Technology Center (PETC). The circuit will utilize an extremely fine, micron-sized magnetite media and small diameter cyclones to make efficient density separations on minus-28-Mesh coal. The circuit consists of three subcircuits: Classification Circuit; Dense-Medium Cycloning Circuit; and Magnetite Recovery Circuit. The testing scope involves initial closed-loop testing of each subcircuit to optimize the performance of the equipment in each subcircuit (i.e., Component Testing), followed by open-circuit testing of the entire integrated circuit to optimize the process and quantify the process efficiency (i.e., Integrated Testing). This report contains a short discussion of the project description, objectives, budget, schedule, and teaming arrangement. It also includes a detailed discussion of the above mentioned project accomplishments and plans, organized by the various task series within the project work plan. The final section contains an outline of the specific project goals for the next quarterly reporting period.
Date:
August 13, 1996
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
Bench-scale testing of the micronized magnetite process. Sixth quarterly technical progress report, October--December, 1995
The major focus of the project is to install and test a 500 lbs./hr. fine-coal cleaning circuit at DOE`s Process Research Facility (PRF), located at the Pittsburgh Energy Technology Center (PETC). The circuit will utilize an extremely fine, micron-sized magnetite media and small diameter cyclones to make efficient density separations on minus-28-Mesh coal. The circuit consists of three subcircuits: Classification Circuit; Dense-Medium Cycloning Circuit; and Magnetite Recovery Circuit. The testing scope involves initial closed-loop testing of each subcircuit to optimize the performance of the equipment in each subcircuit (i.e., Component Testing), followed by open-circuit testing of the entire integrated circuit to optimize the process and quantify the process efficiency (i.e., Integrated Testing). This report contains a short discussion of the project description, objectives, budget, schedule, and teaming arrangement. It also includes a detailed discussion of the above mentioned project accomplishments and plans, organized by the various task series within the project work plan. The final section contains an outline of the specific project goals for the next quarterly reporting period.
Date:
August 13, 1996
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The Thresher (Houston, Tex.), Vol. 32, No. 6, Ed. 1 Thursday, August 16, 1945
A weekly student newspaper from the Rice Institute in Houston, Texas that includes campus news and commentaries along with advertising.
Date:
August 16, 1945
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
COMBINED MICROBIAL SURFACTANT-POLYMER SYSTEM FOR IMPROVED OIL MOBILITY AND CONFORMANCE CONTROL
Many domestic oil fields are facing abandonment even though they still contain two-thirds of their original oil. A significant number of these fields can yield additional oil using advanced oil recovery (AOR) technologies. To maintain domestic oil production at current levels, AOR technologies are needed that are affordable and can be implemented by independent oil producers of the future. Microbial enhanced oil recovery (MEOR) technologies have become established as cost-effective solutions for declining oil production. MEOR technologies are affordable for independent producers operating stripper wells and can be used to extend the life of marginal fields. The demonstrated versatility of microorganisms can be used to design advanced microbial systems to treat multiple production problems in complex, heterogeneous reservoirs. The proposed research presents the concept of a combined microbial surfactant-polymer system for advanced oil recovery. The surfactant-polymer system utilizes bacteria that are capable of both biosurfactant production and metabolically-controlled biopolymer production. This novel technology combines complementary mechanisms to extend the life of marginal fields and is applicable to a large number of domestic reservoirs. The research project described in this report is performed jointly by, Bio-Engineering Inc., a woman owned small business, Texas A&M University and Prairie View A&M University, a …
Date:
August 2004
Creator:
Gabitto, Jorge & Barrufet, Maria
Object Type:
Report
System:
The UNT Digital Library
Trace Elements Investigations : The Occurrence of Columbium and Tantalum
The following report is the fourth in a series of reports on rare and uncommon elements prepared by the Geological Survey. This report covers columbius and tantalus, two chemical elements belonging to the fifth group of the periodic table and quinquevalent in most of their compounds.
Date:
August 8, 1983
Creator:
Fleischer, Michael & Harder, James O.
Object Type:
Report
System:
The UNT Digital Library
Bench-scale testing of the micronized magnetite process. Fourth quarterly technical progress report, April--June 1995
The main accomplishments of Custom Coals and the project subcontractors, during this period, included: continued purchase of small equipment and supplies for the circuit; completed the circuit commissioning task; procured one lot of PennMag Grade-K and one lot Grade-L magnetite; completed work on analytical investigations; completed Classifying Circuit Component Testing on Pittsburgh No. 8 coal; completed the final Heavy-Media cyclone component testing on the Pittsburgh No. 8 seam using Grade-K and Grade-L magnetites; continued QA/QC tests on wet screening, wet splitting, Marcy Balance, and reproducibility checks on component tests and component test samples; and completed the magnetite recovery circuit component testing with and without screens using the Grade-K magnetite and the Pittsburgh No. 8 coal seam. This report contains a short discussion of the project description, objectives, budget, schedule, and teaming arrangement. It also includes a detailed discussion of the above mentioned project accomplishments and plans, organized by the various task series within the project work plan. The final section contains an outline of the specific project goals for the next quarterly reporting period.
Date:
August 10, 1995
Creator:
unknown
Object Type:
Report
System:
The UNT Digital Library
The War Whoop (Abilene, Tex.), Vol. 35, No. 29, Ed. 1, Friday, August 8, 1958
Weekly student newspaper from McMurry College in Abilene, Texas that includes local, state and campus news along with advertising.
Date:
August 8, 1958
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History