Aurumin (ASX:AUN) reports assay results have been returned for the recently completed reverse circulation (RC) drilling program at its 100% owned Central Sandstone Gold Project.
The RC drill program was designed to test the potential for a structurally controlled ‘higher grade’ corridor down plunge from the historical Shillington open pit, and to test potential mineralised positions linking the two adjacent deposits.
the results were positive and in line with the exploration model
The company reports that the results were positive and in line with the exploration model.
Drilling was seeking to test for geological linkages between the Shillington and Two Mile Hill deposits and the potential for higher-grade mineralisation along a structurally controlled corridor to both improve and extend the existing Shillington Resource.
Aurumin notes that the RC program consisted of 9 holes and 1,245m were drilled. Drilling occurred in conjunction with the pre-collars for diamond drilling at the Two Mile Hill deposit.
Highlights include:
- SN_SH_RC_22_0003 7m @ 5.78g/t Au from 137m
- SN_SH_RC_22_0004 6m @ 5.40g/t Au from 96m
- SN_SH_RC_22_0007 8m @ 4.99g/t Au from 80m
The Shillington open pit is located about 400m to the south of the Two Mile Hill deposit and historical open pit.
Gold mineralisation is associated with zones of brecciation and quartz veining within a series of stacked, northwest trending and shallow northeast dipping banded iron formation (BIF) units, known as the Shillington BIF package.
The BIF units are hosted within a sequence of tholeiitic and komatiitic basalts, with minor sediment and chert.
Intensive folding is evident at all scales of observation in the Shillington BIF, parasitic folds are common, as are sudden changes in strike and dip and tight, recumbent, isoclinal folding.
The general bedding planes observed in the Shillington BIF are mostly orientated northwest – southeast and west northwest – east southeast with a moderate easterly dip. The BIF hosting mineralisation comprises an upper and middle unit and is about 45m thick, thought to be tapering to 25m thick towards the Two Mile Hill tonalite contact.
Mineralisation occurs as semi continuous lenses within the Shillington BIF package. At Two Mile Hill, the BIF hosted mineralisation occurs adjacent to the contact between the tonalite and the BIF unit, hosting localised ‘high-grade’ mineralisation.
The structure hosting the tonalite is interpreted to project through the Shillington BIF sequence and may have acted as a structural focus for the mineralisation within the Shillington system.
Images: Aurumin Ltd
