Final Report period ending 14 August 1992 EL 6948 Hugh River, EL 6957 Deep Well Range, EL 6963 Yam Creek, EL 6964 Todd River.

Abstract

Interpretation of acquired aeromagnetic data outlined six anomalies possibly associated with kimberlitic diatremes. These anomalies were followed up by helicopter borne magnetics with one anomaly (HR24-2) being further followed up by ground magnetics. The ground magnetics outlined an inhomogeneous, broad, flat lying body with a depth to source of approximately 20m. This anomaly was tested by a single RC percussion hole totalling 36m. The source of the anomaly appeared to be gravels some 10m thick. Reconnaissance gravel and loam sampling was undertaken at a density of 1:20km2. 8 gravel samples returned chromites of non-kimberlitic origin. The base metal potential of the tenements was also examined via a literature review, stream sediment and rock chip sampling. Stream sediment sampling identified several low order Zn-Cu-Mn-Fe anomalies associated with catchments draining the Arumbera Sandstone, Chandler Limestone and Todd River Dolomite. Elevated Zn and Cu is believed associated with scavenging by Mn-Fe. Anomalous results from rock chip samples are also believed due to by Mn and Fe scavenging.