Appendix containing a statistical summary of hyrogeochemical data from ground and surface water samples to accompany a report on U.S. uranium resources in the Ekalaka Quadrangle in Montana, North Dakota, and South Dakota.

A report presenting the results of analyses of the airborne gamma radiation and total magnetic field survey flown for the region identified as the Williston national topographic Map NM13-12.

Report documenting results of an airborne high-sensitivity gamma-ray spectrometer and magnetometer survey of the New Rockford quadrangle in North Dakota, including data acquisition methods, a summary of data and outline of data presentation, area geology, and interpretation of results.

The following report presents results of an airborne high sensitivity gamma-ray spectrometer and magnetometer survey over the Jamestown quadrangle, North Dakota.

The following report presents results of an airborne high sensitivity gamma-ray spectrometer and magnetometer survey over the Devil's Lake quadrangle, North Dakota.

Appendices containing data on uranium availability in the Lemmon Quadrangle to accompany a report on U.S. uranium resources in South and North Dakota.

Appendices containing data on uranium availability in the Dickinson Quadrangle to accompany a report on U.S. uranium resources in North Dakota.

Abstract: This report lists the machine-readable data files developed for the Madison Limestone and Northern Great Plains Regional Aquifer System Analysis (RASA) projects that are stored on magnetic tape and available from the U.S. Geological Survey. Record format, file content, and size are given for: (1) Drill-stem-test data for Paleozoic and Mesozoic formations; (2) geologic data from the Madison Limestone project; (3) data sets used in the regional simulation model; (4) hydraulic-head data for the Lower and Upper Cretaceous aquifers; and (5) geologic data for Mesozoic formations of the Northern Great Plains.

From abstract: During fiscal years 1978 through 1981, the U.S. Geological Survey contracted for the acquisition and analysis of hydrologic data from 104 surface water stations, 26 ground water stations, and 15 precipitation gages as well as for several hundred miscellaneous surface water measurements of flow and water quality. The work was performed in Montana, North Dakota, Wyoming, Utah, New Mexico, and Oklahoma, terminating at the end of the fiscal year 1981. This report is an assessment of this contracting effort from the standpoint of cost and of quality control measures employed to ensure an acceptable product.

From Introduction: "The Dickinson Quadrangle (1º x 2º), North Dakota (Fig. 1), was evaluated to a depth of 1500 m to identify geologic environments and delineate areas that exhibit characteristics favorable for the occurrence of uranium deposits."

From Introduction: "The Lemmon Quadrangle, South Dakota and North Dakota, was evaluated to identify geologic environments and delineate areas that exhibit characteristics favorable for the occurrence of uranium deposits."

From objectives and scope: The objectives of the study were to: (1) Determine the geographic extent of the minable lignite beds and identify aquifers down to a depth of about 400 feet beneath the lower minable lignite; (2) assess the ground-water flow regime in all aquifers found; (3) evaluate the flow characteristics of the two streams draining the study area; and (5) qualitatively assess the impacts mining might have on the hydrologic system.

Purpose and scope: The purpose of this investigation is to describe changes in the ground-water levels and levels of surface-water bodies and to ascertain whether those changes can be ascribed to the raising of the level of Lake Audubon, or to the subsequent filling of the McClusky Canal, or both. The changes will be determined by analysis of water-level records obtained from observation wells.

From introduction: The specific objectives of the study were to: (1) Determine the premining hydrologic and geochemical conditions in the 28 mi2 area; (2) provide a premining data base from which to measure the magnitude of change in the hydrologic system due to coal mining; and (3) determine the probable effects of mining on the water resources in the area.

From objectives and scope: This study was undertaken in response to U.S. Bureau of Land Management concerns for the water resources of the Wibaux-Beach area in the event of lignite mining. The objectives of the study were to: (1) Define the stratigraphic sequence within a few hundred feet above and below the minable lignite; (2) define the premining hydrologic and geochemical regime of the Wibaux-Beach deposit area; and (3) describe some of the hydrologic implications of the strip-mining process. A fourth objective, the establishment of historical data base with which to access any modifications to the system attributable to future mining, was accomplished as a byproduct of the other three.

Average record data listings taken during aerial gamma-ray and magnetic surveys of the Bismarck quadrangle in North Dakota.

Documentation outlining characteristics of field data samples taken in the Dickinson quadrangle.

Documentation outlining characteristics of field data samples taken in the Dickinson quadrangle.

Data gathered at stream sediment sites in the Dickinson quadrangle, including applicable water chemistry measurements (e.g., pH, conductivity, alkalinity) and elemental analyses.

Documentation outlining characteristics of field data samples taken in the Thief River Falls quadrangle.

Data gathered at stream sediment sites in the Thief River Falls quadrangle, including applicable water chemistry measurements (e.g., pH, conductivity, alkalinity) and elemental analyses.

"Results of a reconnaissance geochemical survey of the Thief River Falls Quadrangle, Minnesota and North Dakota, are reported. Statistical data and symbol plots for uranium and uranium-related variables are presented for 471 groundwater and 342 stream sediment samples. Also included is a discussion on geologic factors considered significant in evaluating the potential for uranium mineralization."

Data gathered at well water sites in the Thief River Falls quadrangle, including applicable water chemistry measurements (e.g., pH, conductivity, alkalinity), physical measurements (e.g., temperature, well description, scintillometer readings), and elemental analyses.

The following report presents results of the detailed geochemical survey of the Dickinson quadrangle, North Dakota. Field and laboratory data are presented for 554 groundwater and 554 stream sediment samples.