Caranbirini EL 1332 Annual report for the year ending 1 November 1982

Abstract

A diamond hole, DD82CA1, was drilled to 1000m adjacent to the Emu Fault and intersected abnormal thicknesses of dolomites and minor lead-zinc mineralisation within them below 600m. A gravity response upon which the hole was sited is probably related to this thickening of units in the sequence. This report covers work carried out in the final year of tenure of EL 1332, granted on 02/11/1976. Previous work carried out by Amoco Minerals Australia Company comprised photogeology, surface geological mapping, geochemistry, induced polorization, gravity and aeromagnetic surveys, rotary percussion and diamond drilling, all initially designed to test for relatively shallow occurrences of the NYC shale unit of the Barney Creek Formation, the host of the NYC deposit some 17km to the SSE. CRPS Exploration Pty Limited (CRAE) was invited to participate in exploration within Caranbirini EL 1332 in mid 1980 by Amoco, after a previous partner, Kennecott Explorations (Australia) Ltd had withdrawn after the drilling of the MANT-79-3 near the Emu fault to a depth of 485m without intersecting significant mineralisation. It was suggested that the source of the gravity response on which this hole was sited could still be below the end of the hole, and this was confirmed by modelling the geology with simple geometrical bodies. Accordingly it was decided to extend the diamond drill hole below 485m after carrying out more detailed gravity surveying to check on the quality of the earlier data, and define the response in more detail to assist in the selection of an optimum drill site. The gravity response to the west of the Emu Fault within the EL is probably related to the thickening of dolomites adjacent to the fault. The presence of minor mineralisation in the Cooley Dolomite upgrades the potential of the prospect for a significant lead-zinc deposit.