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Location: 1 km S from Grassy, Tasmania, Australia
26/259 George StSydneyNew South Wales, Australia2000
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Scheelite skarn mineralisation has formed within the metamorphic aureole of the Carboniferous Grassy Granite where it is in proximity to the calcareous sediments and carbonates of the Lower Grassy Group. The Dolphin and Bold Head deposits are hosted in a similar stratigraphic sequence.Mineralisation is hosted within a 100-200m thick sequence of complex skarn mineralogy with two main horizons known as B and C Lens both of 10-30m thickness separated by a similar thickness of skarn altered volcanic sediments. Skarn formation and mineralisation have occurred where carbonates come into direct contact with the intrusion, or adjacent to brittle faults intersecting the intrusion. Mineralisation in the Dolphin deposit is best developed within C Lens which has several distinct mineralogical components including a garnet hornfels, a pyroxene-garnet hornfels and banded pyroxene garnet hornfels. B Lens is an upper dolomite horizon which has been variably hornfelsed and metasomatised with sporadic mineralised pyroxene-garnet skarn.The Dolphin deposit dips east to southeast at approximately 30° before steepening to 50° in proximity of the Decline Fault on the eastern margin of the deposit. The host stratigraphy is broadly folded by several southeast dipping open anticlines or vergence folds with wavelengths of a few tens of metres. Several major southeast and east trending normal faults associated with the folding cut the orebody into discreet fault blocks. The Northern Boundary Fault truncates the mine sequence to north juxtaposing the Lower Grassy Group against the Fraser Formation quartzite. The Mine Sequence is truncated to the south by the granite, the surface of which dips and plunges shallowly north and east.
