Lydia Staisch Dylan Connell Richard Blakely 20240208 tabular and vector digital data Suggested citation: Staisch, L.M., Connell, D.M., Blakely, R.B., 2024, High-resolution airborne magnetic and radiometric survey of the Republic Graben, Okanogan and Kettle metamorphic core complexes, Kootenay Arc and surrounding regions, Northeastern Washington: U.S. Geological Survey data release, https://doi.org/10.5066/P1PKEZOJ. https://doi.org/10.5066/P1PKEZOJ The Republic survey consists of high-resolution aeromagnetic and radiometric data designed to image the subsurface geology and structure of a large portion of northeastern Washington. These data are intended for rigorous modeling and interpretation of the geology and structure in this region and will be used to evaluate the potential for undiscovered resources and will contribute to USGS and Washington DNR-related mineral and geothermal resource assessments of the region. This release includes aeromagnetic and aeroradiometric data collected via low-altitude helicopter flown over northeastern Washington State, centered over the town of Republic, Washington. The data were acquired between September 26, 2022 and August 21, 2023 by Precision Geosurveys, Inc. of Langley, British Columbia and processed by EDCON-PRJ, Inc. of Lakewood, Colorado, contracted by the U.S. Geological Survey and funded through the Earth Mapping Resources Initiative (EarthMRI). The survey includes gridded data from target altitude of 80-100 meters above ground level, subject to aircraft climb and descent limitations. Primary transverse flight lines were flown in the east-west direction and spaced 200 meters apart. Tie lines were flown in the north-south direction and spaced 2000 meters apart. Additionally, the survey includes two transect lines flown down the Similkameen and Okanogan Valleys where local topography was too extreme to maintain an ideal drape surface. A total of 94,506 line kilometers of data were collected over an area of 16,885 square kilometers. Survey procedures are described in detail in the document “WA Republic Mag RAD D22 Project Report_report.pdf” available in this data release. The Republic aeromagnetic and aeroradiometric survey was collected over steep and highly variable terrain, thus the terrain clearance should be considered carefully when modeling and interpreting magnetic and radiometric data. This data release includes .csv file databases for the main survey and transect data collections, derivative magnetic and radiometric data in map view in .grd and .tiff file format, and shapefiles of the transect lines along the Similkameen and Okanogan Valleys. These data were collected as part of the Earth Mapping Resources Initiative (Earth MRI) program of the U.S. Geological Survey (USGS) in collaboration with the Washington Department of Natural Resources to better understand the geology and critical mineral resources in the area. Files that are available in this data release include base flight lines for the survey in .shp format, base footprint for the survey in .shp format, transect flight line for the survey in .shp format, geoTIFF images of the total-field and reduced-to-pole magnetic intensity (tmi and rtp, respectively), total-field vertical gradient (tmi_vg), radiometric total count (tc), potassium (k), thorium (th), and uranium (u) raster images. The contractor’s report describing the survey parameters, field operations, quality control and data reduction procedures and zip files containing the contractor's deliverable products are also included. The deliverable products are provided as received from the contractor. Binary files in this package are readable using the free software "Geosoft Viewer" or commercial software "Oasis Montaj". This metadata describes the following files: ContractorDeliverables_WA_Republic_MAG_RAD_D22.zip FootPrint_WA_Republic_base_WGS84z11n.shp LinePath_WA_Republic_base_WGS84z11n.shp LinePath_WA_Republic_transects_WGS84z11n.shp WA_Republic_tc.tif WA_Republic_u.tif WA_Republic_th.tif WA_Republic_k.tif WA_Republic_uth.tif WA_Republic_uk.tif WA_Republic_thk.tif WA_Republic_mag_tmi.tif WA_Republic_mag_tmi_vd.tif WA_Republic_mag_rtp.tif The zip compressed Contactor's Deliverables are provided as an original data as received archive only. As such they are not described individually in the Entity and Attribute section of this metadata. The original contractor's report and contractor provided Profile Data Channel Descriptions files are part of this zip package and contain the entity and attribute descriptions for all these files as received. The Contactor's Deliverables zip file ContractorDeliverables_WA_Republic_MAG_RAD_D22.zip contains the following files: Republic_magnetic_data folder with Mag Profile Data Channel Descriptions.docx, Republic_mag.gdb, Republic_rtp.grd, Republic_tmi.grd, Republic_tmi_hg.grd, Republic_tmi_vg.grd and several derivative geotiff files in RGB format; Republic_spec_data folder with files Spec Profile Data Channel Descriptions.docx, Republic_spec.gdb, Republic_dem.grd, Republic_k.grd, Republic_tc.grd, Republic_th.grd, Republic_thk.grd, Republic_u.grd, Republic_uk.grd, Republic_uth.grd, Republic_ternary.tif, Republic_ternary.map, several derivative geotiff files in RGB format, and folder republic_nasvd_spectrum.zip with a csv file of spectral data; Republic_transect_lines_data folder with files transect_mag.gdb and transect_spec.gdb; WA_Republic_mag_rad_D22_Metadata.xlsx; and WA_Republic_MAG_RAD_D22_Report_508.pdf. 20220926 20230821 ground condition Complete None planned northeast Washington State -120.0800 -116.9774 49.0377 47.7054 ISO 19115 Topic Category geoscientificInformation economy USGS Thesaurus magnetic field (earth) geophysics geospatial datasets aeromagnetic surveying aeroradiometric surveying potassium uranium thorium Mineral Resources Sedimentology Structural Geology Economic Geology None Mineral Resources Program MRP Geology, Minerals, Energy, and Geophysics Science Center GMEG Earth Mapping Resources Initiative EarthMRI airborne geophysical survey U.S. Geological Survey USGS National Cooperative Geologic Mapping Program NCGMP USGS Metadata Identifier USGS:65959be8d34e3265ab152eed Common geographic names Washington United States None. Please see 'Distribution Info' for details. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey (USGS), no warranty expressed or implied is made regarding the display or utility of the data for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. The USGS or the U.S. Government shall not be held liable for improper or incorrect use of the data described and/or contained herein. Lydia M Staisch U.S. Geological Survey, SOUTHWEST REGION Research Geologist mailing address

632 SW Hall St

Portland OR 97201 US 650-439-2638 650-329-5491 lstaisch@usgs.gov Daily quality control of the magnetic and radiometric data was performed by the contractor and monitored by the USGS scientist-in-charge. Further quality control measures occurred post flight by the contractor and USGS scientist-in-charge before approval and acceptance of the final data. The data have been peer reviewed and compared with related ancillary data. Data were visually inspected for reasonableness and spatial consistency. 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 Precision Geosurveys, Inc. and EDCON-PRJ, Inc. and are described in the contractors report included with this data release. Field quality control and assurance procedures were undertaken by Precision Geosurveys, Inc. and EDCON-PRJ, Inc. and are described in the contractors report included with this data release. The airborne survey was flown under contract with Precision Geosurveys, Inc. and EDCON-PRJ, Inc. from September 26, 2022 to August 21, 2023. 20230821 The final survey data and report were delivered on October 5, 2023. 20231005 Created geoTIFF images in ArcGIS Pro by exporting the data grids provided by the contractor into .xyz files and then into .csv files. 20240102 Created Esri shapefiles of area footprint and line paths for the survey using the line data provided by the contractor. 20240104 Raster Grid Cell 1435 2327 1 Universal Transverse Mercator 11 0.9996 -117.0 0.0 500000.0 0.0 row and column 100.0 100.0 meters WGS_1984 WGS 84 6378137.0 298.257223563 FootPrint_WA_Republic_base_WGS84z11n.shp Outline of the survey area. U.S. Geological Survey FID Fiducial number U.S. Geological Survey 0 0 Shape Definition of ESRI Arc GIS object U.S. Geological Survey object type ID Index number ID for each row U.S. Geological Survey 0 0 Area_KM Regional extent of polygon shapefile U.S. Geological Survey 16745.309771 16745.309771 kilometers LinePath_WA_Republic_base_WGS84z11n.shp Detailed flight lines of the main survey U.S. Geological Survey FID Fiducial number U.S. Geological Survey 0 1495 Shape Definition of ESRI Arc GIS object U.S. Geological Survey object type ID Index number ID for each row U.S. Geological Survey 0 0 Line Index number ID for each line flown U.S. Geological Survey Index number ID for each line flown LinePath_WA_Republic_transects_WGS84z11n.shp Flight lines of the transects U.S. Geological Survey FID Fiducial number U.S. Geological Survey 0 1 Shape Definition of ESRI Arc GIS object U.S. Geological Survey object type ID Index number ID for each row U.S. Geological Survey 0 0 TransectID Name of transect U.S. Geological Survey Name of transect Length_KM Distance of transect in kilometers U.S. Geological Survey 96.2 111.2 kilometers The zip compressed Contactor's Deliverables are provided as an original data as received archive only. As such they are not described individually in the Entity and Attribute section of this metadata. The original contractor's report and contractor provided Profile Data Channel Descriptions files are part of this zip package and contain the entity and attribute descriptions for the files as received. The Contactor's Deliverables zip file, ContractorDeliverables_WA_Republic_MAG_RAD_D22.zip contains the following files: Mag Profile Data Channel Descriptions.docx Republic_mag.gdb Republic_rtp.grd Republic_tmi.grd Republic_tmi_hg.grd Republic_tmi_vg.grd Spec Profile Data Channel Descriptions.docx Republic_spec.gdb Republic_dem.grd Republic_k.grd Republic_tc.grd Republic_th.grd Republic_thk.grd Republic_u.grd Republic_uk.grd Republic_uth.grd Republic_ternary.tif Republic_transect_mag.gdb Republic_transect_spec.gdb WA_Republic_mag_rad_D22_Metadata.xlsx WA_Republic_MAG_RAD_D22_Report_508.pdf https://doi.org/10.5066/P1PKEZOJ GS ScienceBase U.S. Geological Survey mailing address

Denver Federal Center, Building 810, Mail Stop 302

Denver CO 80225 United States 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 for other purposes, nor on all computer systems, nor shall the act of distribution constitute any such warranty. Digital Data https://doi.org/10.5066/P1PKEZOJ None 20240208 Lydia M Staisch U.S. Geological Survey, SOUTHWEST REGION Research Geologist mailing address

632 SW Hall St

Portland OR 97201 US 650-439-2638 650-329-5491 lstaisch@usgs.gov FGDC Biological Data Profile of the Content Standard for Digital Geospatial Metadata FGDC-STD-001.1-1999