The Rockford Project is located in the highly prospective Fraser Range district of Western Australia and covers a total area of 3,088km2. Exploration is primarily focussed on magmatic nickel-copper sulphide mineralisation, along with volcanogenic massive sulphide (VMS/VHMS) style zinc-copper-silver and Tropicana style structurally controlled gold mineralisation.
A detailed breakdown of ownership, area and manager is given below:
- Legend (100%) 238km2;
- Legend (70%)/Creasy Group (30%) Two joint ventures (JV) covering 2,192km2 with Legend manager;
- IGO (60%)/Creasy Group (30%)/Legend (10% free carry) JV covering 634km2 with IGO manager;
- IGO (70%)/Legend (30% free carry) JV covering 24km2 with IGO manager
In 2015 Legend acquired an extensive exploration dataset over the entire Rockford Project, which is constantly being added to by Legend’s activities and reinterpreted/interrogated to identify specific areas for follow up exploration. These high-quality datasets include:
- Project wide high resolution aeromagnetic data at 50m line spacing
- Detailed gravity data over an 800m/400m x 100m grid, comprising 35,600 stations
- Aircore drilling with multi-element analysis of bottom-of-hole samples
- Detailed petrological descriptions of bottom-of-hole aircore samples
- Project wide soil and calcrete geochemical sampling over an 800m x 400m grid.
Exploration activities completed by Legend to Q3 2020 over the Rockford Project since the commencement of the JV on 23 September 2015 include:
- Project-wide geophysical data interpretation
- 3D inversion modelling of the aeromagnetic and gravity data
- Moving loop electromagnetic surveys selected target areas
- Fixed loop electromagnetic surveys over selected target areas
- Target ranking and evaluation
- Ongoing reconnaissance and infill Aircore drilling to generate and advance exploration targets
- RC and Diamond Drilling of geochemical and geophysical targets generated on prospect scale
- Mawson Ni-Cu-Co Discovery December 2019
Exploration results to date by both Legend and Creasy Group have highlighted seven priority prospects. These include magmatic nickel-copper sulphide style targets at Mawson, Octagonal, Magnus, Hurley, and Crean and VMS/VHMS style zinc-copper-silver targets at Shackleton and Worsley.
The initial and continued discovery of massive nickel-copper sulphide at Mawson confirms the prospectivity of not only the Mawson Prospect, but the 96km2 Mawson Intrusive Complex, and the greater >3000km2 of the Rockford Project area.
Legend achieved a watershed milestone in December 2019 at the Mawson prospect at its Fraser Range Rockford Project with the discovery of massive nickel-copper sulphides.
Subsequent diamond and RC drilling has identified extensions of nickel-copper sulphide mineralisation in all directions from the discovery hole RKDD007. Results to date include (see image gallery)
For further information, including latest assay results, please see the ASX Announcements.
Meanwhile the regional aircore, innovative moving loop EM surveys, and detailed gravity surveys will be ongoing throughout the project area to generate the next targets of the Rockford Project.
Legend is continuing a disciplined, systematic approach to the detection of identified mineralisation and evaluation of targets at Mawson.
Ongoing and planned activities include:
- RC Drilling – RC drilling is a cost-effective tool designed to systematically evaluate aircore geochemical targets into primary rock, shallow DHTEM targets, and geological targets, driven by the ever-evolving 3D exploration model
- Diamond Drilling – Used to target interpreted Ni-Cu mineralisation extensions, DHTEM targets at depths below 300m, and structural and geological targets generated from previous RC and diamond drilling.
- EM Geophysics – specifically DHTEM continues to play a key role in identifying potential extensions and new Ni-Cu mineralised zones. DHTEM is completed on all RC and diamond drillholes.
- Environmental Studies – A Level 1 Flora and Fauna Survey was undertaken in October 2020. Results of this survey will be received and reviewed in 2021, with additional field surveys to be completed if required.