Rumble Resources Ltd’s (ASX:RTR) (FRA:20Z) latest reconnaissance reverse circulation (RC) drilling and mapping program has expanded the large-scale gold-copper-silver system at Amaryllis Prospect within the Munarra Gully Project, Cue in WA's Mid-West.
A gold-copper-silver system has been defined over 2.3 kilometres in strike and completely open under shallow cover of 10 to 40 metres, in association with a major north-south trending shear system named the Amaryllis Prospect.
The style of mineralisation has very similar characteristics to known large-scale Chibougamau gold-copper shear vein-type deposits in the eastern part of the Archaean Abitibi Greenstone Belt in Quebec, Canada.
Rumble has now advanced the geological model to aid in predicting potential deposits along the Amaryllis Shear Zone.
The single reconnaissance RC drill traverse 500 metres north of the Amaryllis Prospect intercepted the main mineralised shear zone with a more than 200 metres wide multiple perched supergene gold blanket.
There were multiple gold intersections across the 200 metres wide supergene zone including:
- 8 metres at 1.06 g/t gold from 80 metres – 4-metre composites)
- 4 metres at 4.02 g/t gold from 112 metres – 4-metre composites)
- 8 metres at 0.7 g/t gold from 64 metres – 4-metre composites)
- 4 metres at 3.39 g/t gold from 119 metres
About 15 kilometres of the Amaryllis Shear Zone remain untested.
Calytrix Gold-Copper-Silver zone
RC drilling of the newly named Calytrix gold-copper-silver zone has confirmed strong continuity of copper (more than 1% copper) and gold (more than 1 g/t gold) mineralisation, including 5 metres at 1.16% copper, 0.78 g/t gold, 16.2 g/t silver from 109 metres.
Over a strike 350 metres (open), the intersections highlight strong continuity of mineralisation in predominantly intensely sheared porphyritic dacitic high-level intrusives.
Mineralisation is completely open down dip.
Drilling, mapping and subsequent petrographic and mineragraphic studies by Rumble has inferred the style of mineralisation as gold-copper-silver shear vein type (epigenetic) in association with overprinting of potential distal low to high tenor base metal volcanogenic mineralisation (VMS).
The style of mineralisation has very similar characteristics with Chibougamau gold-copper-silver shear vein-style deposits in the eastern part of the Abitibi Greenstone Belt in Quebec, Canada.
These Chibougamau deposits have produced 3.5 million ounces of gold and 1 million copper metal tonnes at an average weighted grade of 1.76% copper and 2.05 g/t gold.
Exploration geological model
Based on strong geological similarities between the Amaryllis gold-copper-silver mineralisation and known gold-copper (silver) shear vein style mineralisation in the Chibougamau region, Rumble has advanced the geological model to aid in predicting potential deposits along the regionally extensive Amaryllis Shear Zone.
Based on the comparative style of mineralisation with respect to Chibougamau types, Rumble will complete a downhole transient electromagnetic (TEM) survey within the Calytrix zone to affirm if there is a conductive response from the known pyrite-chalcopyrite-pyrrhotite mineralisation.
It will undertake follow-up diamond drilling targeting higher tenor mineralisation based on conductance.
This will allow structural information, which is currently lacking due to no historic diamond drill core available and provide mineralisation and host characterisation.