Exploration Licence 2593 “Blinman” is located 500 km north of Adelaide in the Central North Flinders Ranges, South Australia. The licence covers an area of 1616km2 and was initially granted to Minotaur Gold NL on 21 April 1999. Minotaur was...
Exploration Licence 2593 “Blinman” is located 500 km north of Adelaide in the Central North Flinders Ranges, South Australia. The licence covers an area of 1616km2 and was initially granted to Minotaur Gold NL on 21 April 1999. Minotaur was targeting base metal mineralisation in the region. A joint venture agreement was signed between Minotaur Gold NL and Perilya Limited on 7 September 1999 with Perilya assuming management of the licence. The Blinman EL 2593 lies in the northern part of the Adelaide Geosyncline, a deformed sedimentary basin of Late Proterozoic to Middle Cambrian age, flanked by crystalline basement complexes of the Gawler and Curnamona Cratons. Zinc, lead and copper mineralisation is found throughout the geosyncline generally associated with lithologies of Cambrian marine shelf carbonate environments. Following the Delamerian Orogeny, diapirism and metasomatism were active which resulted in base metal deposits becoming localised in particular stratigraphic and structural settings. During the first year of tenure, exploration commenced on the licence targeting known prospects for base metal mineralisation. Initially research for mineralisation potential of the licence was obtained from open file company reports within EL2593. This resulted in the compilation of a Regional Prospect Database along with a regional stream sediment database that will be used to identify future geochemical targets for further investigation. The acquisition, processing and interpretation of the AGSO (Australian Geological Survey Organisation) geophysical data was also completed. A reconnaissance trip was made to the area for field evaluation, minor rock chip sampling (9) was completed at this time. An orientation soil survey (48) covering 4 size fractions was also completed prior to a larger scale soil sampling program (129) at the Donkey Bore Prospect. The prospect was identified as a possible location for residual accumulations of supergene Pb Zn in an area of possible karstic dissolution in an area of alteration where Cambrian limestone disappears beneath transported cover. The survey identified a zone of anomalous Zn with two zones >100 ppm Zn outlined; the western zone is 400 m x 100 m and open to the northwest, while the eastern zone is 600 m x 100 m and returned a peak value of 861 ppm. During the second year of tenure, exploration work completed on the tenement included the digitisation of historical stream sediment sampling data and were used to prioritize geochemical anomalous areas. This was followed up with the collection of 78 stream sediments samples for analysis. A 1:100 000 scale LANDSAT image of the entire North Flinders region was acquired to assist in prospect generation, 1:25 000 scale images were produced for all of the main areas of interest and have been roughly interpreted with a focus on structure and alteration. Many prospects were reconnaissance mapped at 1:10000 or 1:5000 scale, for a total of 12 days mapping. Rock chip samples (81) were collected and analysed for Cu, Pb, Zn and Ag from across several prospects. A further 169 soil samples were collected. Of the soil samples from this reporting period and the previous, 294 were reanalysed for a fuller suite of elements (Be, Bi, Sb, Cd, Sr, Ga, Ge, As, Mo, V, Mn). No further work was undertaken during the period. Exploration work has largely ceased until Native Title issues have been resolved and agreements signed. During the third year of tenure, Perilya completed a number of work programs with the focus of the work being to evaluate the numerous prospects that have been previously identified. A further 203 soil samples were sent for reanalysis for a full multielement suite. Two rock chip samples were analysed for Zn, Au, Ag, Be, Bi, Sb, Cd, Sr, Ga, Ge, As, Mo, V, and Mn. Two days were spent visiting the Donkey Bore, Blackwater Springs and Wirrealpa prosects to review the geological and structural controls on mineralisation. No further on ground work was undertaken pending a resolution to Native Title issues. A sample of manganiferous float was taken on the southern wall of Blackwater Springs karst No 2. The assay returned at 3.9%Zn and 53ppmAg with high Be, Be, Mo and moderate Cd. This result significantly upgrades the potential of this karst.
More +