Airborne gamma-ray spectrometer and magnetometer survey: Redding quadrangle, California. Final report

The total intensity map indicates that maximum magnetic intensities are mainly observed in the east and northeast. A presumably complex anomalous zone, with intensities in excess of 53,600 gammas, is present in the northeast over the Trinity Mountains. The radiometric maps indicate a large continuous zone of general uranium and thorium enrichment in the north central and central part of the Redding quadrangle, striking northwest-southeast. A zone of general uranium depletion is present in the west center, in the western part of Trinity National Forest. The study indicates seventeen anomalies that are primarily caused by uranium radiation and fifteen anomalies that are primarily caused by thorium radiation. None of these thirty-two features is sufficiently intense or otherwise distinctive to suggest that they are commercially feasible ore deposits