Partners SouthernEra Resources (SUF-T) and Caldera Resources (CDR-T) have completed a shallow aircore drilling program over 16 aeromagnetic anomalies indicative of kimberlite pipe intrusions on the 1,350-sq.-km Yilgarn Craton project in the Eastern Goldfields area of Western Australia.
The targets, some of which have anomalous counts of chrome spinel at the surface, were selected from more than 50 magnetic anomalies. Extensive weathering in the areas reaches to depths of up to 100 metres. Preliminary petrologic work on weathered material and leached drill chips indicates ten of the anomalies are caused by ultrabasic intrusions.
Thirteen 8-kg drill samples derived from the ten targets were sent to Lakefield Research for caustic dissolution.
SouithernEra’s examination of concentrates from Lakefield has identified kimberlitic chrome spinels with diamond inclusion chemistry, plus ilmenite and pyrope garnets. No microdiamonds (smaller than 0.5 mm in at least one dimension) were recovered from the small samples. A previous loam sample from one of the targets did yield a single micro.
Based on the positive results, all data is currently being analyzed. A decision on whether or not to advance the project will follow.
In July, Caldera reported preliminary results from 16 magnetic targets on the project. Ten anomalies proved to be caused by ultrabasic intrusions while drilling in the remaining six intersected basement lithologies.
Geochemical results from 100 samples submitted for 28-element inductively-coupled-plasma analysis were received, and Caldera says that a comparison to literature values for kimberlite is “very encouraging,” particularly with respect to incompatible elements. All 10 targets show enrichment in alkali and rare-earth elements.
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