This data release provides digital flight line data for a high-resolution airborne magnetic and radiometric survey over parts of northern Maine. The airborne data collection was funded by the U.S. Geological Survey (USGS) Earth Mapping Resource Initiative (Earth MRI) with goals of better understanding volcanogenic massive sulfide mineral deposits, sediment hosted manganese deposits, and their surrounding geologic framework. Data for this survey were collected and processed by Sander Geophysics under contract with the USGS. The airborne survey took place June-July 2021. Using a fixed wing aircraft with a magnetometer mounted in a tail stinger and a fully calibrated gamma ray spectrometer, data were collected along northwest-southeast flight lines spaced 250 meters (m) apart with northeast-southwest tie lines flown every 2500 m. The target terrain clearance was 100 m, with higher clearance over areas with rugged topography and population centers due to safety considerations. A total of 43,271-line kilometers (km) of data were collected. Processing details are provided in the contractor report. Binary files in the contractor package are readable using the free software "Geosoft Viewer" or commercial software "Oasis Montaj."