Combined final and surrender report for the period 3 March 2003 to 1 March 2012

Abstract

ELs 23510, 25491, 26495 and 26509 have been an important part of the exploration activities being conducted by the Legend International Holdings in the Northern Territory. ELs were considered prospective for commercial source of diamonds. A substantial exploration program has been conducted on ELs 23510, 25491, 26495 and 26509, initially by Astro (2003-2006) and then by Legend (2006-2011). Variety of exploration techniques were used with an aim to develop a coherent understanding of propectivity of the project area and to identify targets that may host kimberlite pipe. Geophysical work included acquisition of airborne EM and ground gravity data and detailed interpretation of proprietary, historical company and semi-regional NTGS geophysical data. HMA sampling was conducted to find new or validate previously known indicator mineral targets. Geochemical survey comprises assaying of surface (rock, soil, stream sediments) samples. Microprobe analysis was carried out on indicator minerals to establish their mantle or crustal origin. Photogeological mapping was conducted to enhance litho-structural understanding of the area. Some of the identified high ranking geophysical targets were drilled to test existence of kimberlite. Targets identified from extensive airborne and ground geophysical surveys were drill tested but failed to interest intersect any kimberlite. Positive samples identified from the detailed review of indicator mineral chemistry were followed-up in 2010-2011 and 2011-2012 with patchy encouraging results. Geochemical characterization of recovered chromites has been shown to have numerous sources including Proterozoic volcanics and sediments. No additional priority geophysical target was indentified in the 2009 geophysical review. However, there is now a greater appreciation of chemical composition of indicator minerals (mainly chromites) from the Karawa (Foelsche) region. The variability in the indicator mineralogy highlights the complexity and difficulty in pinpointing a particular source within the Foelsche project. Considering above mentioned factors and with the shift of focus on other projects held by the company in the region, it is decided to surrender all tenements.