During August 1969 a low-level (350 feet above surface) airborne spectrometer-magnetometer survey covering 3213 line miles, at a nominal 1/4 mile line spacing, was flown over the entire area of SMLs 209 and 210. Spectometer profiles of U, Th and total count were obtained that reveal a number of zones containing sets of intense radiometric anomalies, which in some cases are associated with strong magnetic anomalies. The radiometric anomalies seen over the Crocker Well and Crocker Well East mined uranium deposits are of the order of 1100 and 1000 total counts per second above background, whereas anomalies stemming from undisturbed ground are more of the order of 200 to 500 c/s, and occasionally up to 800-900 c/s. An attempt was made to classify the radiometric anomalies into groups distinguished by predominant country rock type and by other geophysical, i.e. magnetic, characteristics. Separately, it appears that the magnetic anomalies related to basic rocks and to epidote-actinolite or other types of hornfels or skarns are not very intense, i.e. 500 gammas or less. When the amplitude of the anomalies approaches 1000 gammas, magnetite may be associated. Large amplitude (1000 to 2500 gamma) magnetic anomalies seen in places covered by Quaternary overburden are probably related to Precambrian bedrock iron formations or to magnetite concentrations in rocks of the Ethiudna Calc-silicate Group. Quantitative analysis of several interpretable anomalies indicates a Quaternary overburden thickness of about 350 feet.