Homer, part of Talisman’s Springfield Project, is highly prospective for new VMS discoveries. Homer hosts the interpreted along-strike extension of Sandfire Resources’ DeGrussa copper-gold mine stratigraphy.
Homer is located within the northern corridor of Narracoota Volcanics that are interpreted to be highly prospective for Volcanogenic Massive Sulphide (VMS) deposits. Prior to the formation of the joint venture with Sandfire Resources NL, Talisman Mining conducted exploration activities that included:
- Geological mapping
- Geochemical sampling
- Airborne magnetic surveys
- Air-core (AC), Reverse Circulation (RC) and diamond drilling
- Gravity surveys
- Moving-loop and down-hole EM surveys
This work returned very encouraging results, which confirmed Homer to be one of the most prospective targets within the Springfield Project area.
Talisman’s exploration results were further supported by Sandfire’s maiden drilling program at Springfield. Hole TLDD0001 at Homer was the first diamond hole drilled by Sandfire on the Springfield Project, and was completed in August 2014. The hole was designed to target a modelled conductor, which was interpreted to sit within the extension of the prospective DeGrussa stratigraphic horizon, approximately 5km to the east of DeGrussa. The conductor resulted from the analysis of high-powered FLEM and DHEM surveys in six drill holes previously drilled by Talisman.
TLDD0001 intersected a 37m package of rocks which Sandfire has interpreted to be potentially analogous to the DeGrussa host horizon. The package consists of siliciclastic rocks with variable haematite alteration, ranging from unaltered to pervasively altered. Sporadic jasper clasts were observed throughout the package. Within the most altered component of the package, a narrow zone of strong silicification, banded magnetite and fine sulphides was intersected. The VMS stratigraphic package (including trace disseminated copper mineralisation) identified in TLDD0001 is interpreted to be indicative of a proximal VMS environment.
Figure 1: Diamond drilling at Homer, located at the Springfield Project, with interpreted regional geology and proximity to Sandfire’s DeGrussa Mine
Sandfire subsequently drilled hole TLDD0003 at Homer (see Figure 1) to test the eastern strike extension of the interpreted C5 host horizon roughly 450m ENE of the TLDD0001 intersection. The location of the drill collar coincided with a recently completed seismic line to facilitate stratigraphic interpretation. The drill hole intersected haematitic exhalite with jasper clasts, which is interpreted by Sandfire to be the C5 target horizon. This horizon returned weakly anomalous base metal and trace elements. The hole confirms the continuation of the C5 host horizon and supports additional work by Sandfire in the area heading further east along strike.
More drilling has occurred and is planned to test the Homer prospect.