THE UNICORN GEOCHEMICAL GRID
Molybdenum (ppm Mo) Contour Plan and Geochemical Surface,
with superimposed base, precious and transition metal geochemistry.
The Mt Unicorn (DUN) grid (~ 2.9 X 2.2 km) comprises some 1312 soil, float and rock chip samples taken on 100 x100 m grid intervals. The central zone was in filled on 50m centers comprising some 298 samples of approximately equal soil to rock chip and float samples. Peak analyses were used in contouring in cases where both rock and soil were taken from a single location. Grey areas show null values. Data interpolated and smoothed to an approximate 25m.
Radials illustrating preferred orientations and multiple ringed structures about the central molybdenum anomaly are noticeably associated with the Mt Unicorn topographic feature. The large Unicorn molybdenum geochemical anomaly (top illustration) is associated with a silicified lithocap draped over the Unicorn dacitic intrusive largely altered entirely to
silica-seracite, the whole sequence is highly altered with extreme silicification and sericite alteration in the apical cap, along with secondary and primary
haematite, chalcopyrite and pyrite. Copper forms a ring about the Mo anomaly, but drilling also revealed internal extensive copper molybdenum and high tenure silver for such styles, along with some rhenium and indium. CSAMT (telluric geophysics) has shown the surface geochemical expression expands as conductors beneath apron
aplite, rhyodacite breccia and sediments I interpreted as the lower parts of a sub volcanic dome complex. The entire mountain is anomalous in silver and large high tenure distal bismuth zones up to 1km in diameter occur with precious metal enrichment are suggestive of concealed differentiated igneous lobes.
Bernhard Hochwimmer, Aug. 2008.
