Report issued by the U.S. Bureau of Mines discussing the iron-ore mining accident experience in the Lake Superior District. Frequency and severity rates of accidents between 1940 and 1943 are presented. This report includes tables.

Final report analyzing aerial gamma ray and magnetic data in the Fairmont quadrangle, including a detailed geologic summary, interpretation report, reduced scale copies of all maps and profiles, histograms, and statistical tables for the quadrangle.

Final report analyzing aerial gamma ray and magnetic data in the La Crosse quadrangle, including a detailed geologic summary, interpretation report, reduced scale copies of all maps and profiles, histograms, and statistical tables for the quadrangle.

First volume of a report documenting a high-sensitivity airborne radiometric and magnetic survey of four quadrangles in Wisconsin, Minnesota, and Michigan including documentation about data collection and analysis.

A high sensitivity airborne radiometric and magnetic survey of the Rice Like, Iron Mountain, Eau Claire and Green Bay 1:250,000 NMTS Quadrangles within the states of Wisconsin, Michigan, and Minnesota. A total of 10,340 line miles of high sensitivity radiometric and magnetic data were collected within these quadrangles. Traverse lines were flown at a spacing of 3.125 miles in an east/west direction at a 18.375 miles seperation. All data were collected utilizing a fixed wing aircraft and over 3,500 cubic inches of Nal crystal detector. Magnetometer data were collected utilizing a high sensitivity proton magnetometer. Data were recorded digitally at 1.0 second intervals aboard the aircraft. Navigation was performed using both visual and doppler techniques. All data presented in this report as corrected profiles of all radiometric variables, magnetic data, radar and barometric altimeter data, air temperature and airborne bismuth contributions. Radiometric data presented are corrected for Comptron Scatter, altitude dependence and atmospheric Bismuth. These data are also presented on microfiche, and digital magnetic tapes. In addition, anomaly maps and inerpretation maps are presented in relating known geology or soil distribution to the corrected radiometric magnetic data.

During the months of August and September, 1979, geoMetrics, Inc. collected 12,415 line miles of high sensitivity airborne radiometric and magnetic data in adjoining portions of South Dakota and Minnesota over seven 1 by 2 degree NTMS quadrangles (Thief River Falls, Grand Forks, Fargo, Milbank, Watertown, New Ulm, and St. Cloud). All radiometric and magnetic data were fully corrected and interpreted and are presented as eight volumes.

Second volume of a report documenting a high-sensitivity airborne radiometric and magnetic survey of the Ashland quadrangle including maps documenting geophysical and geochemical data.

Second volume of a report documenting a high-sensitivity airborne radiometric and magnetic survey of the Eau Claire quadrangle including maps documenting geophysical and geochemical data.

This report discusses aeromagnetic data that was obtained from uranium anomalies discovered in the Fargo quadrangle of Minnesota and North Dakota.

This report discusses aeromagnetic data that was obtained from uranium anomalies discovered in the Grand Forks quadrangle of Minnesota and North Dakota.

This report discusses aeromagnetic data that was obtained from uranium anomalies discovered in the Milbank quadrangle of South Dakota, North Dakota, and Minnesota.

This report discusses aeromagnetic data that was obtained from uranium anomalies discovered in the New Ulm quadrangle of Minnesota.

This report discusses aeromagnetic data that was obtained from uranium anomalies discovered in the Saint Cloud quadrangle of Minnesota.

This report discusses aeromagnetic data that was obtained from uranium anomalies discovered in the River Falls quadrangle of Minnesota and North Dakota.

This report discusses aeromagnetic data that was obtained from uranium anomalies discovered in the Watertown quadrangle of South Dakota and Minnesota.

Second volume of a report documenting a high-sensitivity airborne radiometric and magnetic survey of the Ashland quadrangle including magnetic, ancillary and radiometric data.

Second volume of a report documenting a high-sensitivity airborne radiometric and magnetic survey of the Eau Claire quadrangle including magnetic, ancillary and radiometric data.

From abstract: The objective of the work was to define areas showing surface indications of a generally higher uranium content where detailed exploration for uranium would most likely be successful.

A report regarding an airborne gamma-ray spectrometer and magnetometer survey of the Bemidji Quadrangle, Minnesota

The following report is the second volume in a series of data presenting results of an airborne high sensitivity gamma-ray spectrometer and magnetometer survey over the Bemidji quadrangle, Minnesota. This volume contains data maps of the results.

A report regarding an airborne gamma-ray spectrometer and magnetometer survey of the Brainerd Quadrangle, Minnesota

The following report is the second volume in a series of data presenting results of an airborne high sensitivity gamma-ray spectrometer and magnetometer survey over the Brainerd quadrangle, Minnesota. This volume contains data maps of the results.

A report regarding an airborne gamma-ray spectrometer and magnetometer survey for the Duluth Quadrangle, Minnesota.

The following report is the second volume in a series of data presenting results of an airborne high sensitivity gamma-ray spectrometer and magnetometer survey over the Duluth quadrangle, Minnesota. This volume contains data maps of the results.