Mount Hill

• The Mount Hill project is located on the northern edge of the Lincoln Uplands and comprises mainly Hutchison Group metasediments under unconsolidated Cainozoic sediments.  The Kalinjala Mylonite Zone runs along the eastern margin and separates Hutchison Group rocks of the Cleve Subdomain from Lincoln Complex gneiss and amphibolite of the Spencer Subdomain.   Immediately north of Mount Hill railway siding, Mesoproterozoic sediments of the Blue Range Beds overlie deformed Hutchison Group. The Port Lincoln railway runs through the centre and the Lincoln Highway runs along the eastern edge of the project area.

  The base of the Blue Range Beds is considered to be a high priority unconformity uranium target.  Not only does the basal unconformity overlie probable graphitic schists associated with Hutchison Group BIFs but it also intersects and is locally offset by a major regional fault.  There is potential for both East Alligator River and Athabasca Basin style mineralistion. At the Mount Hill prospect, Pancontinental located a ?faulted contact between prospective Hutchison Group carbonates and the Blue Range Beds with a coincident ground radiometric anomaly.  Trenching, rock chip and soil sampling identified uranium anomalism up to 260ppm U (in silicified Katunga Dolomite/ironstone) with associated thorium, lead and nickel.

There are a series of long north- to northeast-trending aeromagnetic anomalies.  The eastern Sunny Brae anomaly is the structurally most complex with evidence of tight folding and faulting and forms the eastern limb of a major antiformal structure that plunges north under the Mesoproterozoic sediments.  The Salt Creek and Burrawing mines occur along strike to the south. The western Mount Hill aeromagnetic anomalies form the western limb of the antiformal structure and represent two parallel BIF units in the south.  Both anomaly trends are considered high priority base metal targets. The Sunny Brae prospect is a stream sediment geochemical copper-zinc anomaly with 0.11% Cu, 0.56% Zn and associated lead. 

There are a number of drainage systems within the project area that may have potential for palaeochannels uranium mineralisation.  The Dutton River is considered the highest priority target since it drains an area immediately adjacent to the Mesoproterozoic Blue Range Beds unconformity.  The mouth of the Dutton River near Port Neill has anomalous radioactivity.

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