Anne E. McCafferty 20161201 CSV: comma seperated values, Portable Document Format (PDF), and shapefile Denver, CO U.S. Geological Survey http://dx.doi.org/10.5066/F7B56GT8 This publication provides digital flight line data for a high-resolution horizontal magnetic gradient and radiometric survey over the Ironton, Missouri area of southeast Missouri. Data were collected using a fixed wing aircraft with magnetometers mounted in the tail stinger and each wing tip pod and a fully calibrated gamma ray spectrometer. The survey operated out of the Farmington, Missouri airport during January to mid-February of 2016. The survey covers an irregularly shaped region within a 54 x 53 square-kilometer area centered on the town of Ironton, Missouri. Data were collected along north-south flight lines spaced 300 meters (m) apart with east-west tie lines flown every 3000 m. A mean terrain clearance of 140 m was maintained except where safety dictated a higher elevation. A total of 10,253 line kilometers (km) of data were collected. Three files are available in this publication and include flight line data for the magnetic gradient survey, flight line data for the radiometric survey and a report describing the survey parameters, field operations, quality control and data reduction procedures. In addition, there are two data directories that describe the attributes in the flight line data files. The magnetic gradient and radiometric survey was flown as one component of a U.S. Geological Survey (USGS) mineral resource project to investigate the iron oxide-apatite-REE and iron oxide copper-cobalt-gold deposits in southeast Missouri. The survey was designed to specifically target areas known to host iron oxide deposits including the Iron Mountain, Pilot Knob, Shepard’s Mountain, and Cedar Hill iron oxide deposits. All the targeted iron oxide deposits are hosted in exposed or shallowly buried Mesoproterozoic igneous rocks. Results from the survey will aid in mapping the geologic framework for the iron mineralization in the St. Francois Mountains and provide insight into the magnetic and radioelement signatures of the deposits. 20160110 20160216 ground condition Complete Not planned -91.03 -90.64 37.83 37.35 ISO 19115 Topic Category geoscientificInformation USGS Thesaurus geophysics magnetic surveying aeromagnetic surveying magnetic field (earth) geospatial datasets aeroradiometric surveying none Crustal Geophysics and Geochemistry Science Center Mineral Resources Program CGGSC MRP USGS Metadata Identifier USGS:57681584e4b07657d19f586d Geographic Names Information System (GNIS) Missouri Pilot Knob Shepard Mountain Cedar Hill Iron Mountain Ironton none There is no guarantee concerning the accuracy of the data. Any user who modifies the data is obligated to describe the types of modifications they perform. Data have been checked to ensure the accuracy. If any errors are detected, please notify the originating office. The U.S. Geological Survey strongly recommends that careful attention be paid to the metadata file associated with these data. Acknowledgment of the U.S. Geological Survey would be appreciated in products derived from these data. User specifically agrees not to misrepresent the data, nor to imply that changes made were approved or endorsed by the U.S. Geological Survey. Please refer to http://www.usgs.gov/privacy.html for the USGS disclaimer. Anne E. McCafferty U.S. Geological Survey mailing and physical

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Denver CO 80225 USA 303 236 1397 anne@usgs.gov Daily quality control of raw radiometric and magnetic data was performed by the contractor. Further quality control measures occurred post flight by the contractor and USGS scientist-in-charge before approval and acceptance of the final data. No formal logical accuracy tests were conducted Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. Field quality control and assurance procedures were undertaken by the Terraquest field crew and are described in the contractor's report included with this data release. Field quality control and assurance procedures were undertaken by the Terraquest field crew and are described in the contractor's report included with this data release. Final radiometric and magnetic data processing was undertaken by Terraquest at their offices in Markham, Ontario, Canada. This processing workflow is described in the contractor's report included with this data release. 20160216 Final data and contractor's report were received by USGS from Terraquest Ltd. 20160330 Final data were exported to CSV-format to meet open data requirements. 20160620 An ESRI shapefile of flight line locations was developed from the radiometric and magnetic data. 20160620 Vector G-polygon 1 0.00001 0.00001 Decimal Degrees WGS84 WGS84 6378137 298.25722 USA_MO_Ironton_Airborne_survey_footprint_2016.shp Shapefile with data table containing attribute information associated with the data set. This footprint shapefile is part of a larger inventory of airborne geophysical surveys that are available on the Mineral Resources On-Line Spatial Data site, http://mrdata.usgs.gov/. U.S. Geological Survey Survey Identifier for the survey, typically begins with the 2-letter abbreviation of the state containing the survey, or the state containing the largest fraction of the survey's area, if the survey crosses state lines. Newly released surveys will be assigned the digital object identifier (DOI). U.S. Geological Survey Survey identifier Survey2 Alternative designation of the survey number. Typically omits the state abbreviation, and is frequently the same as field, 'no'. U.S. Geological Survey Alternative designation of the survey number. state Hyphen-separated list of two-letter state abbreviations indicating states over which the survey was flown. U.S. Geological Survey List of states over which the survey was flown. no Numerical identifier of the survey. Typically a 4-digit number, but may have a letter suffix, and some values are composed of several such identifiers separated by underscore characters. A few begin with a state abbreviation. U.S. Geological Survey Numberical identifier of the survey. state_1 Hyphen-separated list of state abbreviations, probably indicating states over which the survey was flown. Some rows have more states than the state field, some have fewer, some are empty. U.S. Geological Survey Secondary list of state abbreviations. type Abbreviations indicating the content and format of the survey data. U.S. Geological Survey M/R-D The airborne survey collected magnetic and radiometric data collection in digital format. U.S. Geological Survey M-D The airborne survey collected magnetic data collection in digital format. U.S. Geological Survey name Name of the survey. U.S. Geological Survey Survey name typically indicating location. flown_by Organization carrying out the survey. U.S. Geological Survey Organization carrying out the survey. date_flown Dates over which the survey was carried out. Typically a single month expressed ad MM/YY or a range of months separated by hyphen. Question marks may occur in the month values. U.S. Geological Survey Month and year of survey SPACING Approximate distance between survey lines. a number or range of numbers (indicated by hyphen), with distance units abbreviated or spelled out. U.S. Geological Survey Approximate distance between survey lines. DIR General direction of the survey flight lines, as compass points such as E-W or a strike designation such as N30W. U.S. Geological Survey Survey flight line direction. ALTITUDE Altitude of the aircraft during the survey, in feet. May include a hyphen-separated range of values. Typically includes a few letters indicating the base for the altitude measurement, such as AG for "above ground". U.S. Geological Survey Altitude of the aircraft during the survey, in feet. LNMI Total distance traversed during the survey, in miles. U.S. Geological Survey 6371 6371 miles Spacing2 Numerical value indicating upper range of the line spacing, expressed in miles. U.S. Geological Survey 0.19 0.19 mile Area Area of the survey bounding polygon in square kilometers. U.S. Geological Survey 4393.624155 4393.624155 Square kilometer areamiles Area of the survey bounding polygon in square miles. U.S. Geological Survey 1696.38777 1696.38777 Square mile PubID USGS Publications Warehouse identifier for the publication associated with the survey. May be a semicolon-separated list of such identifiers. New publications may be represented by their unique digital object identifier (DOI). U.S. Geological Survey Digital object identifier (DOI) or USGS publication identifier for the publication associated with the survey. publicatio URL to publication describing data content or related publication U.S. Geological Survey Data release URL or URL to publication describing content. datatype Type of survey (digitized, digital, or NURE) U.S. Geological Survey Type of survey (digitized, digital, or NURE) USA_MO_Ironton_Airborne_survey_flight lines_2016.shp Shapefile with data table containing attribute information associated with the data set. This shapefile shows the location of flightlines from this survey U.S. Geological Survey Line Identifier for the flight line. U.S. Geological Survey Line identifier Data dictionaries describing the entity and attributes for the airborne magnetic data were developed from the contractor's report. The magnetic data were acquired with 3 Scintrex CS-3 cesium vapour magnetometers. The data were flown under contract to the U.S. Geological Survey by TerraQuest, Ltd. http://dx.doi.org/10.5066/F7B56GT8. https://www.sciencebase.gov/catalog/file/get/57681584e4b07657d19f586d?name=DataDictionary_AirborneMagneticDataFields_TerraQuest.csv Data dictionaries describing the entity and attributes for the the airborne radiometric data were developed from the contractor's report. The radiometric data were acquired with radiation Solutions RS-500 gamma ray spectrometer. The magnetic data were acquired with 3 Scintrex CS-3 cesium vapour magnetometers. The data were flown under contract to the U.S. Geological Survey by TerraQuest, Ltd. http://dx.doi.org/10.5066/F7B56GT8. https://www.sciencebase.gov/catalog/file/get/57681584e4b07657d19f586d?name=DataDictionary_AirborneRadiometricDataFields_TerraQuest.csv U.S. Geological Survey - ScienceBase U.S. Geological Survey - ScienceBase mailing and physical

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Denver CO 80225 USA 1-888-275-8747 sciencebase@usgs.gov Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data on any other system or for general or scientific purposes, nor shall the act of distribution constitute any such warranty. Part or all of this report is presented in Portable Document Format (PDF); the latest version of Adobe Acrobat Reader or similar software is required to view it. 20200929 Anne E. McCafferty U.S. Geological Survey, Crustal Geochemistry and Geophysics Science Center Research Geophysicist mailing and physical

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Denver CO 80225 USA 303 236 1397 anne@usgs.gov Content Standard for Digital Geospatial Metadata FGDC-STD-001-1998