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36,687 Matching Results
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New Geophysical Technique for Mineral Exploration and Mineral Discrimination Based on Electromagnetic Methods
The research during the first year of the project was focused on developing the foundations of a new geophysical technique for mineral exploration and mineral discrimination, based on electromagnetic (EM) methods. The proposed new technique is based on examining the spectral induced polarization effects in electromagnetic data using modern distributed acquisition systems and advanced methods of 3-D inversion. The analysis of IP phenomena is usually based on models with frequency dependent complex conductivity distribution. One of the most popular is the Cole-Cole relaxation model. In this progress report we have constructed and analyzed a different physical and mathematical model of the IP effect based on the effective-medium theory. We have developed a rigorous mathematical model of multi-phase conductive media, which can provide a quantitative tool for evaluation of the type of mineralization, using the conductivity relaxation model parameters. The parameters of the new conductivity relaxation model can be used for discrimination of the different types of rock formations, which is an important goal in mineral exploration. The solution of this problem requires development of an effective numerical method for EM forward modeling in 3-D inhomogeneous media. During the first year of the project we have developed a prototype 3-D IP …
Date:
March 9, 2005
Creator:
Zhdanov, Michael S.
Object Type:
Report
System:
The UNT Digital Library
Geochemistry of the Lathrop Wells volcanic center
Over 100 samples have been gathered from the Lathrop Wells volcanic center to assess different models of basalt petrogenesis and constrain the physical mechanisms of magma ascent in the Yucca Mountain region. Samples have been analyzed for major and trace-element chemistry, Nd, Sr and Ph isotopes, and mineral chemistry. All eruptive units contain olivine phenocrysts, but only the oldest eruptive units contain plagioclase phenocrysts. Compositions of minerals vary little between eruptive units. Geochemical data show that most of the eruptive units at Lathrop Wells defined by field criteria can be distinguished by major and trace-element chemistry. Normative compositions of basalts at Lathrop Wells correlate with stratigraphic position. The oldest basalts are primarily nepheline normative and the youngest basalts are exclusively hypersthene normative, indicating increasing silica saturation with time. Trace-element and major-element variations among eruptive units are statistically significant and support the conclusion that eruptive units at Lathrop Wells represent separate and independent magma batches. This conclusion indicates that magmas in the Yucca Mountain region ascend at preferred eruption sites rather than randomly.
Date:
March 1, 1996
Creator:
Perry, F.V. & Straub, K.T.
Object Type:
Report
System:
The UNT Digital Library
Compendium of Regulatory Requirements Governing Underground Injection of Drilling Wastes
This report provides a comprehensive compendium of the regulatory requirements governing the injection processes used for disposing of drilling wastes; in particular, for a process referred to in this report as slurry injection. The report consists of a narrative discussion of the regulatory requirements and practices for each of the oil- and gas-producing states, a table summarizing the types of injection processes authorized in each state, and an appendix that contains the text of many of the relevant state regulations and policies.
Date:
March 3, 2003
Creator:
Puder, Markus G.; Bryson, Bill & Veil, John A.
Object Type:
Report
System:
The UNT Digital Library
Geology and Ore Deposits of the Freeland-Lamartine District, Clear Creek County, Colorado
Report discussing the results of a geological study of the Idaho Springs-Central City area of the Front Range mineral belt. The study was still in progress at the time of publication.
Date:
March 1954
Creator:
Harrison, J. E. & Wells, J. D.
Object Type:
Report
System:
The UNT Digital Library
Mineral Kingdom. (Lawton, Okla.), Vol. 2, No. 22, Ed. 1 Thursday, March 30, 1905
Weekly mining newspaper from Lawton, Oklahoma Territory that includes local, territorial, and national news along with advertising.
Date:
March 30, 1905
Creator:
Davis, Frank C.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Mineral Kingdom. (Lawton, Okla.), Vol. 2, No. 21, Ed. 1 Thursday, March 23, 1905
Weekly mining newspaper from Lawton, Oklahoma Territory that includes local, territorial, and national news along with advertising.
Date:
March 23, 1905
Creator:
Davis, Frank C.
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
Productivity and injectivity of horizontal wells
One of the key issues addressed was pressure drop in long horizontal wells and its influence on well performance. Very little information is available in the literature on flow in pipes with influx through pipe walls. Virtually all of this work has been in small diameter pipes and with single-phase flow. In order to address this problem new experimental data on flow in horizontal and near horizontal wells have been obtained. Experiments were conducted at an industrial facility on typical 6 1/8 ID, 100 feet long horizontal well model. The new data along with available information in the literature have been used to develop new correlations and mechanistic models. Thus it is now possible to predict, within reasonable accuracy, the effect of influx through the well on pressure drop in the well.
Date:
March 6, 2000
Creator:
Aziz, Khalid
Object Type:
Report
System:
The UNT Digital Library
Geology of the central Mineral Mountains, Beaver County, Utah
The Mineral Mountains are located in Beaver and Millard Counties, southwestern Utah. The range is a horst located in the transition zone between the Basin and Range and Colorado Plateau geologic provinces. A multiple-phase Tertiary pluton forms most of the range, with Paleozoic rocks exposed on the north and south and Precambrian metamorphic rocks on the west in the Roosevelt Hot Springs KGRA (Known Geothermal Resource Area). Precambrian banded gneiss and Cambrian carbonate rocks have been intruded by foliated granodioritic to monzonitic rocks of uncertain age. The Tertiary pluton consists of six major phases of quartz monzonitic to leucocratic granitic rocks, two diorite stocks, and several more mafic units that form dikes. During uplift of the mountain block, overlying rocks and the upper part of the pluton were partially removed by denudation faulting to the west. The interplay of these low-angle faults and younger northerly trending Basin and Range faults is responsible for the structural control of the Roosevelt Hot Springs geothermal system. The structural complexity of the Roosevelt Hot Springs KGRA is unique within the range, although the same tectonic style continues throughout the range. During the Quaternary, rhyolite volcanism was active in the central part of the range …
Date:
March 1, 1980
Creator:
Sibbett, B.S. & Nielson, D.L.
Object Type:
Report
System:
The UNT Digital Library
The Alto Herald and The Wells News 'N Views (Alto, Tex.), Vol. 92, No. 47, Ed. 1 Thursday, March 31, 1988
Weekly newspaper from Alto, Texas that includes local, state, and national news along with extensive advertising.
Date:
March 31, 1988
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Alto Herald and The Wells News 'N Views (Alto, Tex.), Vol. 86, No. 43, Ed. 1 Thursday, March 4, 1982
Weekly newspaper from Alto, Texas that includes local, state, and national news along with extensive advertising.
Date:
March 4, 1982
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Alto Herald (Alto, Tex.), Vol. 83, No. 45, Ed. 1 Thursday, March 22, 1979
Weekly newspaper from Alto, Texas that includes local, state, and national news along with extensive advertising.
Date:
March 22, 1979
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
The Cullen Grimes School
Principal Donald Bond, the teachers and the students of the afternoon group at Cullen Grimes School in Mineral Wells, Texas congregate in front of the building in March of 1954.
Date:
March 1954
Creator:
Daniel, W.L.
Object Type:
Photograph
System:
The Portal to Texas History
The Alto Herald and The Wells News 'N Views (Alto, Tex.), Vol. 90, No. 45, Ed. 1 Thursday, March 20, 1986
Weekly newspaper from Alto, Texas that includes local, state, and national news along with extensive advertising.
Date:
March 20, 1986
Creator:
unknown
Object Type:
Newspaper
System:
The Portal to Texas History
Mountaintop Mining: Background on Current Controversies
This report provides background on regulatory requirements, controversies and legal challenges to mountaintop mining, and recent Administration actions. Congressional interest in these issues also is discussed, including legislation in the 111th Congress seeking to restrict the practice of mountaintop mining and other legislation intended to block the Obama Administration’s regulatory actions. Attention to EPA’s veto of the West Virginia mining permit and other federal agency actions has increased in the 112th Congress.
Date:
March 29, 2012
Creator:
Copeland, Claudia
Object Type:
Report
System:
The UNT Digital Library
The Lathrop Wells volcanic center: Status of field and geochronology studies
The Lathrop Wells volcanic center is located 20 km south of the potential Yucca Mountain site, at the south end of the Yucca Mountain range. It has long been recognized as the youngest basalt center in the region. However, determination of the age and eruptive history of the center has proven problematic. The purpose of this paper is to describe the status of field and geochronology studies of the Lathrop Wells center. Our perspective is that it is critical to assess all possible methods for obtaining cross-checking data to resolve chronology and field problems. It is equally important to consider application of the range of chronology methods available in Quaternary geologic research. Such an approach seeks to increase the confidence in data interpretations through obtaining convergence among separate isotopic, radiogenic, and age-correlated methods. Finally, the assumptions, strengths, and weaknesses of each dating method need to be carefully described to facilitate an impartial evaluation of results.
Date:
March 1, 1993
Creator:
Crowe, B.; Morley, R.; Wells, S.; Geissman, J.; McDonald, E.; McFadden, L. et al.
Object Type:
Report
System:
The UNT Digital Library
The Lathrop Wells volcanic center: Status of field and geochronology studies
The purpose of this paper is to describe the status of field and geochronology studies of the Lathrop Wells volcanic center. Our perspective is that it is critical to assess all possible methods for obtaining cross-checking data to resolve chronology and field problems. It is equally important to consider application of the range of chronology methods available in Quaternary geologic research. Such an approach seeks to increase the confidence in data interpretations through obtaining convergence among separate isotopic, radiogenic, and age-correlated methods. Finally, the assumptions, strengths, and weaknesses of each dating method need to be carefully described to facilitate an impartial evaluation of results. The paper is divided into two parts. The first part describes the status of continuing field studies for the volcanic center for this area south of Yucca Mountain, Nevada. The second part presents an overview of the preliminary results of ongoing chronology studies and their constraints on the age and stratigraphy of the Lathrop Wells volcanic center. Along with the chronology data, the assumptions, strengths, and limitations of each methods are discussed.
Date:
March 1, 1992
Creator:
Crowe, B.; Morley, R.; Wells, S.; Geissman, J.; McDonald, E.; McFadden, L. et al.
Object Type:
Article
System:
The UNT Digital Library
Reservoir simulation and geochemical study of Cerro Prieto I wells
Combined reservoir simulation and geochemical data analysis are used to investigate the effects of recharge and other reservoir processes occurring in the western part of the Cerro Prieto, Mexico, geothermal field (i.e., Cerro Prieto I area). Enthalpy-based temperatures and bottomhole temperatures are calculated based on simplified models of the system, considering different reservoir boundary conditions and zones of contrasting initial temperatures and reservoir properties. By matching the computed trends with geothermometer-based temperature and enthalpy histories of producing wells, the main processes active in the western area of Cerro Prieto are identified. This part of the geothermal system is strongly influenced by nearby groundwater aquifers; cooler waters readily recharge the reservoirs. In response to exploitation, the natural influx of cold water into the shallower alpha reservoir is mainly from the west and down Fault L, while the recharge to the deeper beta reservoir in this part of the field, seems to be only lateral, from the west and possibly south. 11 refs., 12 figs.
Date:
March 1, 1990
Creator:
Lippmann, M.J. (Lawrence Berkeley Lab., CA (USA)) & Truesdell, A.H. (Geological Survey, Menlo Park, CA (USA))
Object Type:
Article
System:
The UNT Digital Library
Landowner's Guide to Plugging Abandoned Water Wells
This publication contains information on the hazards associated with abandoned wells, including groundwater contamination.
Date:
March 2010
Creator:
Texas Commission on Environmental Quality. Texas Groundwater Protection Committee.
Object Type:
Pamphlet
System:
The Portal to Texas History
Use of an acoustic borehole televiewer to investigate casing corrosion in geothermal wells
Corrosion of well and surface equipment due to the presence of hot, corrosive brines is one of the major problems facing geothermal operators. For wellbore casing, this problem is complicated by the fact that in-place inspection is difficult at best. In an attempt to improve this situation, a prototype acoustic borehole televiewer designed to operate in geothermal wells was used to study the corrosion damage to casing in three commercial wells. The results of this experiment were promising. The televiewer returns helped to define areas of major corrosion damage and to indicate the extent of the damage. This paper briefly discusses the corrosion problem, describes the acoustic borehole televiewer, and then summarizes the results of the field test of the televiewer's capability for investigating corrosion.
Date:
March 1, 1986
Creator:
Carson, C. C. & Bauman, T.
Object Type:
Article
System:
The UNT Digital Library
Quaternary rhyolite from the Mineral Mountains, Utah, USA. Final report, Volume 77-10
A suite of silicic volcanic rocks is associated with the Roosevelt Hot Springs geothermal area in southwestern Utah. The volcanic sequence includes Tertiary rhyolite 8 My old and obsidian, ash and rhyolite of Quaternary age. The Quaternary lavas are characterized by high silica content (76.5% Si0/sub 2/) and total alkalies in excess of 9 percent. Obsidians commonly contain greater amounts of fluorine than water. Two older flows (0.8 My) can be distinguished from younger dome and pyroclastic material (approximately 0.5 My) by subtle differences in their chemistry. The mineralogy of the rhyolites consists of alkali feldspar, plagioclase, and small amounts of Fe-Ti oxides, biotite, hornblende and rare allanite. Fe-Ti oxide temperatures are 740 to 785/sup 0/C for the flows and 635 to 665/sup 0/C for the domes; two feldspar temperatures give similar results. The phase relationships of bulk rock, glass and feldspar compositions demonstrate that the younger Quaternary rhyolites could have been derived from the earlier magma type, represented by the obsidian flows, by a process of crystal fractionation. The major phases which must fractionate are alkali feldspar, plagioclase and quartz with minor amounts of biotite, magnetite and ilmenite participating also. Trace element patterns support this scheme as well. The …
Date:
March 1, 1978
Creator:
Evans, S. H., Jr. & Nash, W. P.
Object Type:
Report
System:
The UNT Digital Library
Cementing of geothermal wells. Progress report No. 8, January--March 1978
Work to implement the program plan for the development of improved high temperature cementing materials for geothermal wells is continuing. Thermal gravimetric analysis studies on high temperature polymer cements indicated that formulations containing organosiloxane are thermally stable at 350/sup 0/C. Only slight (1%) weight losses at 400/sup 0/C were measured. Samples exposed for 10 days to 25% brine at 238/sup 0/C have not deteriorated. The relatively long curing time for some of the formulations (> 3 hr at 150/sup 0/C) enhances the probability of being able to pump the materials. Work to optimize polymer cement (PC) systems containing cross-linked mixtures of styrene, acrylonitrile, and acrylamide is continuing. Improvements in methods for curing the system have extended the thermal stability to the range 250/sup 0/ to 300/sup 0/C. Differential scanning calorimter and infra-red analysis studies are being performed on PC samples containing each of the chemical constituents of Type III portland cement and CaO compounds of anhydrous cements such as 3CaO . SiO/sub 2/, 2CaO . SiO/sub 2/, and 3CaO . Al/sub 2/O/sub 3/. The results indicate that 3CaO . SiO/sub 2/ derived from the chemical reaction between CaCO/sub 3/ and SiO/sub 2/ has a significant effect on the thermal stability …
Date:
March 1, 1978
Creator:
Kukacka, L. E.
Object Type:
Report
System:
The UNT Digital Library
Sam Houston School
Students, teachers and principal D.R. Hudson, of the Sam Houston School in March 1954 stand outside the school building.
Date:
March 1954
Creator:
Daniel, W.L.
Object Type:
Photograph
System:
The Portal to Texas History
[News Script: Heroin confiscated]
Script from the WBAP-TV/NBC station in Fort Worth, Texas, relating a news story about confiscated heroin in Mineral Wells.
Date:
1971-03-03T24:00:00
Creator:
WBAP-TV (Television station : Fort Worth, Tex.)
Object Type:
Script
System:
The UNT Digital Library
The Sam Houston School--- An Afternoon Group of 1954
Students, teachers and the principal, D.R. Hudson, of the Sam Houston School's Afternoon Group are shown here in March of 1954. The picture was taken outside the school building.
Date:
March 1954
Creator:
Daniel, W.L.
Object Type:
Photograph
System:
The Portal to Texas History