Geology and Mineralisation
The majority of the property is underlain by Neogene andesite intrusions with volcanic equivalents including lavas, tuffs. Dacitic equivalents are found in the upper part of the sequence. Unconsolidated quaternary volcanic tuff deposits occur as a thin veneer occupying topographical highs.
Spectral mapping has noted the presence of magmatic-hydrothermal advanced argillic alteration (AAA lithocap), including K-alunite, pyrophyllite-diaspore, zunyite, dickite and kaolinite occur in several occurrences over an area of about 1.5 km diameter, in the eastern half of the property. The largest zone of advanced argillic alteration is about 950 x 550 m in area, oriented NW and zoned outward to paragonite, and chlorite alteration zones.
Sporadic and coarsely crystalline low sulphidation (“LS”) epithermal vein mineralization is hosted by an argillic alteration assemblage of illite-sericite-carbonate-pyrite-marcasite with strong E-W structural control. MMAJ and Sumitomo describe LS epithermal mineralization as a series of sub vertical quartz-carbonate-pyrite+marcasite veins and veinlets, with crystalline, banded & drusy textures along with minor amounts of disseminated base metal sulphides (sphalerite/galena/ chalcopyrite).
Sampling by 5Sumitomo (1982) of historical mining portals reported values of <0.01-6.0 g/t Au and <0.5-6.0 g/t Ag, whilst MMAJ sampling in 1991-92 returned values of 0.001-0.33 ppm Au, 0.1-1.96 ppm Ag, 1-63 ppm As, 1-33 ppm Sb, 0.05-1.76 ppm Hg & 1-262 ppm Mo.