Drill Rig Moved To Test Prospect Targets At Red Mountain Project
AUSTRALIA - White Rock Minerals Ltd reported an update on the 2019 exploration program underway at the Red Mountain high-grade zinc and precious metals VMS project in central Alaska (Red Mountain Project). There are already two high grade deposits at the Red Mountain Project, with an Inferred Mineral Resource1 of 9.1 million tonnes @ 12.9% ZnEq2 for 1.1 million tonnes of contained zinc equivalent.
Summer field exploration activities commenced in late May with on-ground activities including surface reconnaissance mapping, surface geochemical sampling (soils and rock chips), ground electrical geophysics (MT and CSAMT), downhole EM surveys and diamond drilling. Final data from the 500km2 airborne electromagnetic (AEM) geophysical survey, which was flown in April and May this year, has now been received and is being integrated with surface geochemistry to prioritise a number of identified VMS targets for drill testing.
Results from the AEM survey show a signature conductivity response at both of the two known high-grade massive sulphide deposits at Dry Creek and WTF. This knowledge is now being used to search for similar look alike responses elsewhere within the Company’s tenement package.
Results show the discrete nature of the conductivity anomalies, with the more subdued conductivity response considered one of the distinguishing features associated with mineralisation versus the stronger conductivity response typically associated with graphitic units within the stratigraphic sequence. The graphitic unit at the base of the Sheep Creek Member is a distinctive marker horizon along the northern limb of the targeted syncline representing an equivalent horizon to that hosting the high-grade WTF massive sulphide mineralisation, where the Inferred Mineral Resource for WTF1 stands at 6.7Mt at 6.2% zinc, 2.8% lead, 189 g/t silver and 1.1 g/t gold for a grade of 14.4% ZnEq2.
Conductivity depth slice of the 1D inversion model of the SkyTEM electromagnetics data at 120m below surface. The survey highlights conductivity features associated with VMS mineralisation at the Dry Creek and WTF deposits. Prospecting of the northern limb along the Glacier Trend, a spatially extensive alteration zone with 10km of strike length, has identified sulphide accumulations, chert and iron formations, all believed to be proximal to horizons prospective for base metal rich massive sulphides along strike and down dip. Additional lithogeochemical analysis of rock chip data has assisted in prioritising areas of interest along the Glacier Trend through the identification of classic VMS alteration vectors. Additional rock chip data specifically characterising vectors associated with black shales and exhalite horizons is now being assessed in conjunction with identifying distinct conductivity responses from the AEM data to assist in drill targeting.
The drill rig has now moved to test the first of these new targets at the Arete prospect. The target at Arete is the down dip projection of a massive sulphide outcrop that exhibits a distinct conductivity response in the AEM that has similarities in geometry and strength to those at the Dry Creek and WTF deposits.
Following the Arete drill hole a number of new targets along the Glacier Trend are being finalised prior to drill testing. Target priorities have been identified at the Sheep/Rogers, Artesia, Irish Knob and Smog South prospects where a combination of exhalative horizons, anomalous geochemistry and coincident AEM conductivity anomalies are being modelled.
A total of seven diamond drill holes have been completed to date in the 2019 program, with no significant massive sulphide mineralisation intersected. The first three drill holes were previously reported3. The subsequent four diamond drill holes tested targets at Platypus (DC19-93), Megan’s (DC19-94), Stingray (WT19-31) and Mantaray (DC19-32).
The company’s address is 24 Skipton Street, Ballarat Victoria 3350, Australia, (61) 455 081 008, www.whiterockminerals.com.au.