Legend Mining Limited’s (ASX: LEG) confidence in the potential of the Rockford Project in WA’s Fraser Range has been boosted with early results received from drilling at the Mawson prospect.
Managing Director, Mark Wilson, said the company has now identified a 600m long geochemical footprint from initial assay results from two diamond drillholes and the first batch of 2020 aircore drillholes from the Mawson prospect.
These results support Legend’s previous statements that Mawson is a large mineralised system. The 21.6m intercept from hole 11 is material in both width and grade,” Mr Wilson said.
“The new aircore assay results received, point to a developing story northeast of the current diamond drilling programme with aircore hole RKAC744 a few hundred metres from the collar of diamond hole 11.
“We have commissioned a closer spaced gravity survey in this area, which is now underway. The datasets from both the gravity and aircore are expected to provide the information for follow up diamond drilling in this area.”
Assay results have been received from high grade intervals in diamond drillhole RKDD011 and from three low grade intervals in RKDD008 at Mawson.
The aircore assays have been returned from the first batch of holes as part of a broad 200m x 200m programme across the greater Mawson area.
RKDD011 was originally designed to test a strong 50,000-60,000S downhole electromagnetic (DHTEM) conductor and also test for extensions to the sulphide mineralisation intersected in adjacent drillholes.
The hole intersected two broad intervals of nickel-copper sulphide mineralisation. The upper interval contains multiple thin/localised units of vein, breccia, disseminated and semi-massive sulphide hosted in mafic/ultramafic intrusive, while the lower interval contains three intercepts of massive pyrrhotite-chalcopyrite-pentlandite.
Diamond drillhole RKDD008 was designed to test a strong 6,000-8,000S offhole conductor identified by DHTEM surveying in RKDD007. This offhole feature was interpreted to represent the down plunge extension of significant nickel-copper sulphide mineralisation previously identified in hole RKDD007 (14.9m @ 1.07% Ni, 0.75% Cu, 0.06% Co from 114m).
RKDD008 intersected multiple significant intervals of nickel-copper sulphide mineralisation, three of which comprise massive sulphides of pyrrhotite-chalcopyrite-pentlandite.
Significant sulphide intervals in RKDD008 are now shown to total 107.9m with massive sulphides accounting for 25.3m. The sulphide mineralisation is hosted in a range of rock types including mafic/ultramafic intrusives and metasediments.
The aircore programme returned anomalous Ni-Cu-Co values were returned from three drillholes RKAC744, 747 and 755 associated with mafic/ultramafic host rocks. Follow up aircore drilling has now been undertaken.
These anomalous results extend over 600m strike from RKAC744 in the southwest to RKAC755 in the northeast. The position of this geochemical feature coincides with the centre of an oval shaped magnetic feature and a 4mgal gravity high.
Future work at Mawson will now include:
- Continued diamond drilling programme targeting extensions to the Ni-Cu mineralisation.
- Integration of geological and geophysical data from diamond drillholes and DHTEM into the Mawson 3D geological model.
- Continued infill aircore drill programme across the greater Mawson area.
- A detailed gravity survey over the main Mawson gravity high.