Geological Report, D A Copper, Nickel Project, Barrow Creek

Abstract

Report recommends detailed analysis of area using geophysics and detailed field work with some areas being investigated using geochemical methods. Exploration detailed below. The original intention of taking up the Crawford Range A and adjacent areas was to endeavour to locate and prospect the Lower Proterozoic geological sequence. The main exploration targets would be aimed at possible large disseminated deposits that could develop into an economic mining situation. Three years of exploration has revealed the possible extent of the Lower Proterozoic on the Crawford Range sheet. Detailed work on Prospect 'DA' has outlined a highly anomalous zone extending the entire length of the grid. Diamond drilling in three locations has indicated possible economic mineralization of Copper Nickel, a fourth location has only indicated low grade mineralization. The over-all geological interpretation is favourable to say the least, the possibility of finding a large disseminated ore-body will depend on a number of factors being favourable, but the evidence to date does indicate there is a good chance of locating an economic deposit within and close by the 'DA' Prospect. Diamond drilling carried out to date was laid down to outline the geology and give initial information on the mineralized zones as indicated by geo-chem air-trac drilling. Study of assay results from the core drilling clearly shows the mineralization within the Quartz Diorite body and adjacent Shale is patchy. In this situation it is almost impossible to gain any accurate concept of grade by drill core intersections that pass through the mineralized zone at right angles, furtner these intersections were in BQ core size (1/16'). The information obtained can only be taken as an indication to the approximate zone of mineralization. Due to the characteristics of the formation of the Quartz Diorite body, true average width is difficult to assess from a few right angle intersections. The other factors to be solved to enable a correct assessment of the situation 'are as follows; 1. The true value of the primary ore at depth well below the zone of replacement of Iron Pyrite, this appears to be below 600 ft vertical depth at a minimum. 2. The actual source of the Nickel and Copper and from which direction it came. This may include subterranean vulcanism and epigenetic Shales within the area. 3. The actual structure situation is as yet not clear and requires careful investigation. 4. The age of the Quartz Felspar Porphyry and the Granite. 5. The extent and flow of underground water along the aquifer formations plus their En and Ph factors. 6. A close study of the airborne mag and radiometrics which should be flown in detail. 7. A close detailed study of the air photos using colour and infra-red flown at a suitable height. 8. Furtner geo-chem drilling to cover the area recommended. Once the work is completed on these factors I am confident the real situation will emerge. From my investigations in the field to date, evidence does suggest we could be on the edge of a substantial mineralized occurrence of considerable magnitude.