|
Deposit Synonyms
Dark Hill Dam; Horse Well
Mineral District
Deposit Summary
ovoid aeromagnetic low near Cornwall Granite with drilling identifying anomalous Cu-Zn mineralisation in altered metasediment. Best value 0.19%Cu. Drilling of gossanous float identified a Cu-U horizon, best U 2m @ 153ppm, also 6m @ 0.57%Cu, 0.25%Zn.
Deposit Description
DARK HORSE, or Horse Well prospect as named by Dominion Mining in the early 1990s is a magnetic low elongate towards 025, and located adjacent to and between the NE extremity of the Ordovician Anabama Granite, and the Ordovician Cromwell Granite to the immediate NE. The area has a thin cover of younger sediment. In 1991 Dominion completed 2 EW traverses of shallow reconnaissance holes across the width of the aeromagnetic low. Mineralisation model was possible destruction of magnetite during introduction of sulphide-bearing hydrothermal fluids. In 2007 Adelaide Resources completed a single drill traverse ~650m north of Dominion’s southern traverse.
The Dominion holes confirmed granite bounding the aeromagnetic low to the west and east, with a wedge of sericite-altered metasediment in between. Geochemical analysis of drill samples confirmed weakly anomalous Cu-Zn mineralisation in a variably altered sequence of fine grained, pyritic, Adelaidean metasediment. Best copper value was 0.19%Cu in host pyrite-albite rock. Common alteration minerals were sericite, biotite, and minor coarse-grained phlogopite.
The Adelaide Resources drill traverse was completed over an area of surface gossanous float exposed for a distance of 3km. The drilling outlined an horizon of weak copper-uranium mineralisation, with a moderate east dip. Best uranium value was in hole ANA-021, 2m @ 153ppm from 11m, and best copper value in hole ANA-020, 6m @ 0.57%Cu, also 0.25%Zn. They concluded that mineralisation was located within structures that cross-cut the host metasediment, and could be traced SW along strike via magnetic imagery to the contact with the Anabama Granite. In late 2007 they drilling to test the down dip extension of shallow mineralisation. Drill samples returned only weak Cu-Zn values in host marble (ref: Anabama Project, www.adelaideresources.com or quarterly report for June 2007).
Note to not confuse ANA prefix for Adelaide Resources holes, with the ANA prefix holes drilled in the same area by the Geological Survey in 1995.
Discovery Year
? 1991
Commodities
Copper, Zinc, Uranium
Ore Minerals
Chalcopyrite, Sphalerite, Uranium Minerals (Non Specific)
Gangue Minerals
|