1967 Butler Dome, Petermann Ranges - assessment of drilling program

Abstract

Within the Butler Dome Area of the Petermann Ranges in the Northern Territory some 5,000 feet of shallow rotary drilling was carried out to determine the nature of the down-dip extensions of a number of copper enriched ironstone cappings in two areas over a total strike length of 2,000 feet. A geological and geochemical appraisal of the chip samples recovered down to depths of 360 feet has clarified a sequence of sedimentary rocks in which there is a distinct enrichment in values of copper and to a less extent, lead and zinc, over the sediments above and below the favourable horizon. The presence of such metallic enrichment along with the recognition of interlayered volcanic rocks and bands of carbon-rich sediment creates an environment, similar to that in which deposits such as Mount Isa and the McArthur River have been located. Results of the programme at Butler Dome fully justify an expanded programme of exploration along the whole line of the favourable horizon represented by the Pinyinna Beds.