[en] The analytical procedures were selected for use based on the elements to be determined and relative accuracy and cost. Uranium is determined by fluorescence spectroscopy, mass spectrometry, and neutron activation. As and Se, frequently associated with U, are determined by flameless atomic absorption spectroscopy. Water samples are analyzed by emission spectroscopy. In addition electrical conductivity and sulfate ion concentrations are determined in water samples. The sample flow, data flow, and quality control are also briefly discussed

[en] The analysis of large numbers of natural groundwater and stream sediment samples by Inductively Coupled Plasma (ICP) Spectroscopy has been applied to a geochemical reconnaissance program as part of the National Uranium Resource Evaluation Program. Approximately 25 elements have been determined in over 60,000 samples by ICP analysis. These data are combined with additional measurements obtained by atomic absorption, colorimetry, neutron activation, and fluorescence spectroscopy. Results are presented and interpreted in terms of the uranium favorability of areas in Texas where this survey has been completed

[en] A pilot geochemical survey was conducted in northwest Texas during April, May, and June 1976. The purpose of this work was to prepare for a subsequent reconnaissance geochemical survey of uranium in northwest Texas and western Oklahoma. Stream sediment, stream water, well water, and ash of plants were analyzed for approximately 25 parameters. The samples were collected in the outcrop area of the Blaine Formation, the Whitehorse and Cloud Chief Group, and the Quartermaster Group (all Permian); and Dockum Formation (Triassic); and the Ogallala Formation (Tertiary). The most valuable sample type for identifying potential uranium mineralization in northwest Texas was determned to be well water. Where available, it is the most reliable for outlining both uranium deposits and, at a wider spacing, a potential uranium district. Of the remaining sample types, stream sediment is more readily available than stream water and appears to be more useful in this area. The most useful determinations in groundwater from five potentially mineralized areas are uranium, sulfate, molybdenum, selenium, alkalinity, arsenic, conductivity, and vanadium. This extract of the original paper is restricted to a discussion of well water results

[en] A pilot geochemical survey of the Llano, Texas, area was conducted during February and March 1976. The purpose of this work was to prepare for a subsequent reconnaissance geochemical survey of uranium in Central Texas. Stream sediment, stream water, well water, and plant ash from five geologic areas were analyzed in the laboratory for approximately 25 parameters. Examples of anomalous values in stream sediment and stream water indicate the usefulness of both sample types in identifying anomalies at a regional reconnaissance-scale station spacing of approximately 5 km (3 mi). Groundwater samples, which generally best indicate the geochemistry of formations at depth in a survey of this type, represent another important tool in detecting uranium mineralization. Anomalies in San Saba County are associated with the Marble Falls-Smithwich Formations and the Strawn Series (Pennsylvanian), the Houy Formation (Devonian and lower Mississippian), and the Hickory Sandstone Member of the Riley Formation (Cambrian). In Burnet County anomalous values are due to the influence of the Valley Spring Formation (Precambrian); and in Blanco County anomalies are found associated with the Riley Formation

[en] A uranium geochemical survey was conducted in the Crystal City and western half of the Beeville Quadrangles, Texas, an area of approximately 34,000 km². Using the Texas Gulf Coast Uranium Province as a study area, this survey demonstrates the applicability of a 2 phase hierarchical sampling program with multielement analysis of the samples for regional geochemical reconnaissance for uranium. Phase I samples of stream sediment, stream water, and well water were collected from drainage basins with a target drainage of 250 km² to identify uranium province lines which define the area in which closer spaced Phase II sampling should be conducted. Phase II samples of stream sediment, stream water, well water, and tree branches were collected from drainage basins with a target drainage of 25 km² in order to identify uranium district lines. Stream sediment, stream water, well water, and ash of tree branches were analyzed for approximately 25 parameters. The most useful sample type for identifying potential uranium mineralization in the Texas Gulf Coast is well water. Wells were found to accurately distinguish both province lines at Phase I sample spacing and district lines at Phase II sample spacing by several methods of evaluation. Results of the survey indicate that the concept of 2 phase sampling with multielement analyses of samples, developed by the ORGDP Project, may yield good results for the remainder of the area to be surveyed by ORGDP with modifications for different geologic regions

[en] A pilot geochemical survey in northwest Texas was conducted during April, May, and June 1976 to prepare for a subsequent reconnaissance geochemical survey of uranium in northwest Texas and western Oklahoma. Stream sediment, stream water, well water, and ash of plants were analyzed for approximately 25 parameters. The samples were collected in the outcrop area of the Blaine Formation, the Whitehorse and Cloud Chief Group, and the Quartermaster Group (all Permian); the Dockum Formation (Triassic); and the Ogallala Formation (Tertiary). Elements anomalous in stream sediments associated with a potentially mineralized area in the Triassic rock are Pb, Mn, Ba, Sc, and Se. Anomalies in stream water associated with the postulated mineralization in the Triassic rock are alkalinity, uranium, selenium, and arsenic. A geochemical model of uranium and associated trace elements in groundwater associated with roll-type mineralization is proposed for the reconnaissance-scale sample spacing of approximately 5 km (3 mi). Based on the geochemical model of trace elements and groundwater, 5 areas of potential uranium mineralization are identified in the pilot survey area: 1 in the Quartermaster Formation, 1 in the Dockum Group, and 3 in the Ogallala Formation. There is no reason to believe that the potential for uranium mineralization is restricted to the area of this survey

[en] The National Uranium Resource Evaluation (NURE) Program was established in the spring of 1973 to evaluate uranium resources and to identify favorable areas for detailed uranium prospecting throughout the United States. Part of the NURE Program is a Hydrogeochemical and Stream Sediment Reconnaissance Survey. The objective is to conduct a reconnaissance survey of the nation's surface water, groundwater, and stream and lake sediment to identify favorable areas for uranium exploration. An area of 33,000 km² (13,000 mi²) was sampled in south Texas to demonstrate the applicability of regional geochemical survey techniques used in the URE Project. The area sampled includes the Crystal City Quadrangle and western half of the Beeville Quadrangle. Units known to host uranium deposits are the Jackson, Catahoula, and Fleming. The youngest host rock for a major uranium deposit is the Goliad Formation. The most useful sample type for identifying potential uranium mineralization in the survey area was well water. Although spacing of wells was wider than intended, coverage was sufficient to accurately define province lines at Phase I spacing and district lines at Phase II spacing by several methods of evaluation. Results of this survey indicate that a 2-phase hierarchial sampling program using multielement analysis of samples is a viable technique for determining uranium province and district lines. With modification for differing geology, it should be applicable to the 2,500,000 km² area to be surveyed by the URE Project

[en] Purpose of this addendum is to provide the reader of the basic data report and the detailed geochemical survey report with a readily obtainable reference explaining the overall ORGDP reporting program in detail. The document describes specific procedures used concerning field and laboratory methodology and quality control. Different types of data presentations used in the basic data reports are defined and explained in detail

[en] A total of 77 groundwater, 101 stream sediment, 90 stream water, and 316 tree samples were collected in southwest Oklahoma during a sampling period from April to June 1976, and were analyzed by October 1976. Variables in groundwater samples include uranium, arsenic, boron, barium, vanadium, conductivity, selenium, total alkalinity, bicarbonate, pH, and sulfate. Variables in stream sediment samples include hot-acid-extractable uranium total uranium arsenic, barium, chronium, lithium, manganese, nickel, scandium, titanium, vanadium, yttrium, and zirconium. Variables in streamwater samples include uranium, arsenic, boron, barium, molybdenum, conductivity, total alkalinity, bicarbonate, pH, and sulfate. Of the variables which are considered usable in groundwater produced from the Hennessey and Post Oak Groups, uranium is positively associated with conductivity, arsenic, and sulfate and negatively associated with barium. Uranium in groundwater produced from the El Reno and White Horse Groups is positively associated with uranium/boron, uranium/sulfate, and selenium, and is negatively associated with arsenic and vanadium. Of the variables which are considered usable in stream sediment representing the Hennessey and Post Oak Groups, U-FL is negatively associated with U-NT/U-FL, barium, chromium, lithium, manganese, nickel, titanium, andvanadium. Of the variables which are considered usable in stream water representing the Hennessey and Post Oak Groups, uranium is positively associated with conductivity, uranium/sulfate, arsenic, boron, barium, total alkalinity, pH, and sulfate. Uranium in stream water representing the El Reno and White Horse Groups is positively associated with conductivity, uranium/boron, uranium/sulfate, arsenic, boron, barium, molybdenum, total alkalinity, and bicarbonate in an area near the Hennessey--El Reno contact, and negatively associated with pH, sulfate, total alkalinity, and bicarbonate in the Cement Oklahoma area

[en] The Grand Junction, Colorado office of the United States Energy Research and Development Administration (ERDA) is conducting the National Uranium Resource Evaluation Program to evaluate the uranium resources in the United States and Alaska. The programme is designed to identify favourable areas for uranium exploration, to assess the supply of domestic resources, and to improve exploration technology. The Nuclear Division of the Union Carbide Corporation has been assigned the responsibility of conducting a hydrogeochemical and stream sediment survey of the mid-continental states in the United States of America. This survey covers approximately 2,500,000km² (1,000,000mi²). The uranium potential of sandstones, Precambrian conglomerates, veins, granites, and phosphorites is being assessed, utilizing a three-part programme consisting of pilot surveys in each geological province and two phases of reconnaissance sampling of drainage basins. Data resulting from this programme are released to private industry by ERDA as they become available. Analyses of results from a typical three-part survey are given. For distinctive geological regions, the pilot survey will: (1) Define characteristic concentration background levels of the elements of interest; (2) identify potential uranium pathfinder elements; (3) determine relationship between stream, stream sediment and botanical samples; (4) identify any necessary modification to field sampling techniques; and (5) determine necessary sensitivities required for chemical analysis. The first reconnaissance phase average sample spacing of one station per 250km² (100mi²) drainage basin is shown to de-lineate general boundaries of uranium provinces, and the second reconnaissance phase average spacing of one station every 25km² (10mi²) drainage basin is shown to identify uranium districts. (author)