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NYMAGEE PROJECT - NSW
The Nymagee Project is located in New South Wales near the historic mining town of Nymagee in central-west New South Wales, 75 km south-east of Cobar and 500 km north-west of Sydney.
Access within the Project is via a well-maintained network of shire roads and station tracks. as shown. The Nymagee Project comprises three 100% owned exploration licenses covering 533.3km².
Generalised Geology of the Cobar Superbasin
Generalised Geology of the Cobar Superbasin
Generalised Geology of the Cobar Superbasin
The Nymagee Project lies within the central portion of the Cobar Supergroup, the Cobar Supergroup was deposited over Ordovician basement when late Silurian sinistral transtension west of the Gilmore Fault Zone triggered the development of a northerly trending rift basin (Cobar Superbasin).
The Cobar Superbasin is a major mining province in Central NSW and hosts a number of world class poly-metallic deposits. The first discovery was in 1870 at the site of the Great Cobar Copper Mine. Known deposits include the Cobar mineral field (Endeavor, CSA, New Cobar, Chesney, New Occidental, Peak and Perseverance mines), and the Nymagee Group (Hera, Nymagee, Federation) Deposits.
Past production and identified resources for the Cobar Basin exceeds 224.5 t Gold, 2.52 Mt Copper, 4.76 Mt Zinc, 2.80 Mt Lead and 6,924 t Silver. The Cobar Supergroup was deposited over Ordovician basement when late Silurian sinistral transtension west of the Gilmore Fault Zone triggered the development of a northerly trending rift basin (Cobar Superbasin).
Nymagee Area Setting
Generalised Geology of the Cobar Superbasin
Generalised Geology of the Cobar Superbasin
Geology in the Nymagee area is dominated by a Late Silurian to Early Devonian extensional basin deposited over a basement of Ordovician turbidite (Grilambone Group) and S-type granites (Erimeran Granite).
Mineralisation in the area is host within both the Cobar Basin and the Girilambone Group rocks. Typical mineralisation in the area host within the Cobar Basin rocks is represented by Nymagee, Hera and Federation owned and operated by Aurelia Metals Ltd. Current total resources for these three deposits – Nymagee (1,500Kt @ 0.1g/t Au, 2.3% Cu, 0.8% Pb, 1.5% Zn and 18g/t Ag), Hera (1,700Kt @ 1.8g/t Au, 0.1% Cu, 2.3% Pb, 3.5% Zn and 25g/t Ag) and Federation (5,100K @ 0.9g/t Au, 0.3% Cu, 5.5% Pb, 9.3% Zn and 7g/ Ag).[1]
Girilambone Group mineralisation in the area is typified by the Restdown Gold Project (Helix Resources Limited). The Restdown Project is being explored by Helix Resources and has a current Inferred Mineral Resource of 3.8Mt at 1.0g/t Au containing 118,000 ounces of gold, [2] it lies within the interpreted Restdown Anticline.
[1] Aurelia Metals Ltd Annual Report 2021
[2] Helix Resources Limited Annual Report 2021
Disruptive Research opens up new prospective corridors
Recent studies by the NSW Geological Survey suggest that the polymetallic deposits in the Nymagee area are epigenetic and distal intrusive related. The findings of the Geological Surveys research demonstrate that the mineralisation at Hera is intrusive related based originally on the high temperature skarn mineralogy displayed within and around the deposits.
Previous exploration efforts in the region have been skewed towards only exploring within the Cobar Basin sediments because the deposits were interpreted to be formed during sedimentation of the basin (syngenetic), the new interpretation on the genesis of the ‘Cobar Style’ deposits has changed to the mineralisation being post sedimentation of the Cobar Basin (epigenetic), therefore epigenetic mineralisation similar to that found at Nymagee-Hera-Federation can be host within the older units.
The new research represents a significant disruption to the exploration status quo and opens new previously under-explored prospective areas for Nymagee-Hera-Federation Style Deposits.
EL8785 (Nymagee)
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Mapped Devonian Intrusions
Mapped Devonian Intrusions
EL8785 lies just east of Nymagee-Hera-Federation. Previous exploration has been limited due to the previous syngenetic mineralisation model, under an epigenetic intrusive related mineralisation model EL8785 is now prospective for Nymagee-Hera-Federation style distal intrusive related deposits.
The western margin of EL8785 the government geology shows there are mapped Devonian intrusions that are spatially associated with the Ironbark Fault. The Ironbark and Rookery Faults are basin margin parallel structures, strike slip movement along the Rookery Fault “in conjunction with fault focused magmatism likely gave rise to structurally hosted distal skarn at Hera”.
A number of these mapped intrusions appear to be magnetic (magnetite or pyrrhotite). Felsic intrusions are non-magnetic and unlikely to have primary magnetite therefore the magnetic highs could be interpreted as pyrrhotite. Pyrrhotite is a common component of nearly all the deposits between Condobolin to Cobar and display discreet magnetic features (this includes the Nymagee Copper Mine).
Mapped Devonian Intrusions
Mapped Devonian Intrusions
Mapped Devonian Intrusions
Mapped Devonian intrusions overlain on the regional AISG Filtered magnetics. The map highlights the spatial association between the Devonian intrusions and point magnetic highs similar to the Nymagee Copper Mine.
Basement Geology
Regional ASIG Filtered Magnetics
Regional ASIG Filtered Magnetics
EL8785 Basement Geology with magnetic highs circled.
Regional ASIG Filtered Magnetics
Regional ASIG Filtered Magnetics
Regional ASIG Filtered Magnetics
Regional ASIG Filtered magnetics, the map highlights the spatial association between known deposits and point magnetic highs.
EL 8638 (BARROW)
EL 8638 (BARROW)
EL 8638 (BARROW)
EL 8638 (BARROW)
EL 8638 (BARROW)
EL8638 has a large coincident soil arsenic – magnetic high anomaly on the eastern side of the lease which remains untested. 1,126 systematic auger soil samples were collected on the western portion of EL8638 and analysed using PXRF onsite before being sent to ALS Global for Au and Ag analysis. The soil auger results highlighted two anomalies, a large north-west to south-east oriented arsenic anomaly spatially related to a similarly oriented magnetic high, and another smaller Arsenic anomaly to the north-east, the area has historically referred to at Bradbury’s Prospect.
The magnetic high may represent pyrrhotite associated with Cobar Style mineralisation and has not been drill tested.
Regional overview of EL 8638 with regional RTP (1VD) magnetics and interpreted Restdown anticline. Bottom left: Arsenic (XRF) sampling results showing anomaly contours over regional RTP (1VD) magnetics. Bottom right: Enhanced view of two arsenic anomalies highlighted by white arrows, the larger associated with a magnetic high and structure.
EL8657 (DYWAT)
Historic regional 400m x 400m first pass systematic soil sampling was completed over almost the entire tenement, the sampling returned anomalous gold assays up to 30ppb.
These first pass soil anomalies have not been followed up. Interpretation of regional magnetics highlights a possible anticline parallel to the Restdown Anticline that hosts Helix’s Cobar Gold Project.