The Rocky Dam Au Project is located 45kms east of Kalgoorlie-Boulder in the Kurnalpi Terrane of the world class Eastern Goldfields Superterrane of Western Australia. Mineralisation styles associated with the project area is Archean mesothermal lode gold typified by numerous world class deposits in the Eastern Goldfields and VMS mineralisation as seen at Teutonic Bore Cu-Pb-Zn-Ag which is also within the Gindalbie domain of the Kurnalpi Terrane. The Rocky Dam project has known massive sulphides which have been sporadically explored over the years, and sits along major structures which are currently being explored by other companies.
The Rocky Dam Au Project is located 30kms east of Kalgoorlie-Boulder in the highly endowed Eastern Goldfields. Situated within the Kurnalpi Terrane the project is immediately along strike from Aruma’s Slate Dam Project and Riversgold’s Kurnalpi Project. The region is highly prospective with Northern Star Resources, Silver Lake Resources and Sumitomo Metal Mining Company all active around the Rocky Dam Project.
The Rocky Dam project has two previously defined gold prospects from the 1990s, by CRA and North, and known outcropping massive sulphide mineralisation.
CRA initially defined a gold anomaly through auger drilling followed up with 2 programs of shallow RAB which resulted in 700m strike anomalism 50-100m wide along a fault zone. Significant drill intercepts included:
• RDR004: 20-24m @ 3.1 g/t Au
• RDR001: 20-24m @ 0.7 g/t Au
• RDR064: 36-39m @ 0.6 g/t Au
CRA drilled two diamond holes under the anomaly which confirmed a thick well altered and mineralised shear zone with best results of:
• RD004: 58-62 @ 2.24 g/t Au
CRA concluded at the time that there was likely a gold deposit there, but not of size to interest CRA.
Also in the 1990s, North carried out soil sampling which highlighted anomalism over the Gap Fault with a peak soil value of 1.1 g.t Au. Wide spaced RAB drilling identified anomalous gold along a mafic dolerite / intermediate to felsic volcanic faulted contact. No further gold exploration was undertaken. More recently, Riversgold has been exploring the Gap Fault immediately along strike of the Rocky Dam Project and have confirmed mineralisation on the tenement boundary with a peak result of:
• QLAC0050: 12-16m @1.5 g/t Au
Recent exploration in the region lead by Aruma at Slate Dam, and Riversgold along the Gap Fault have highlighted the gold potential of the Rocky Dam Project.
The Rocky Dam project has extensive outcropping massive sulphide gossans within an exhalative horizon located in close proximity to the Gap Fault which has been the focus of VMS exploration in the past. The mineralisation is located within the Gindalbie Domain which hosts the Teutonic Bore VMS deposits. To date exploration on the known outcropping massive sulphide has produced sub economic results, however there is no known exploration to have taken place further along the prospective horizons where VMS mineralisation could be located below the surface. This opens up an exciting untouched search space for the exploration of economic massive sulphide mineralisation.
CRA concluded that they had discovered a gold deposit, but not of a size or grade that they required in the 1990s. Additionally, work by North in the 1990s and more recently along strike by Riversgold has highlighted the mineralisation potential of the Gap Faults system. Both of these targets provide immediate drilling opportunities to discover bed rock mineralisation.
Further, systematic exploration via the addition of a few new data sets could reveal VMS targets for drill testing.
With multiple opportunities within such a manageable exploration package, quality, focused exploration can quickly lead to drilling success and the discovery of gold and or base metal VMS mineralisation.