Rumble Resources Ltd (ASX: RTR) has confirmed copper mineralisation in its exploration at the Amaryllis Au-Cu-Ag Prospect, located on the Munarra Gully Project, 60km to the north of the township of Cue, Western Australia.
Rumble recently completed six diamond drill holes which have confirmed mineralisation associated with new EM plates identified in the Calytrix Zone which forms part of Amaryllis Prospect, and along strike from previously identified Au-Cu-Ag mineralisation.
As anticipated the drilling has intersected visual stringer Cu sulphide mineralisation in all six diamond drill holes, which based on previous drill results typically has a correlation with Au-Ag mineralisation. The diamond core is currently being cut and submitted for assay with results expected early next year.
“Whilst the major Zinc-Lead-Silver discovery at the Earaheedy Project is the company’s primary focus, Rumble has some highly prospective projects in its pipeline that are at advanced stages of exploration. Rumble will continue to complete high impact, low-cost exploration drilling at these projects looking to make new discoveries and creating value for shareholders,” Managing Director, Shane Sikora, said.
“Rumble has been systematically advancing the Munarra Gully Project over three years, zeroing in on the Amaryllis Prospect and associated shear zone. The Amaryllis Au-Cu-Ag Prospect is a large-scale Au-Cu-Ag system with over 2.3km’s of partly tested mineralisation and with over 15km of strike potential (no drilling). Within the Amaryllis Prospect, the Calytrix Zone covers over 350m of strike, with previous drilling identifying >1% Cu and >1 g/t Au intersections, highlighting strong continuity of mineralisation.
“Rumble considers the Amaryllis Prospect as having similar geological characteristics to the Chibougamau Au-Cu Shear Vein Deposit, which has produced 3.5 million ounces of gold and one million copper metal tonnes at an average weighted grade of 2.05g/t Au and 1.76% Cu and mined down to 1.1km in depth in Quebec, Canada.
“Based on the potential comparative style of mineralisation with respect to the Chibougamau Au-Cu Deposit (i.e. strong dip component to ore deposits – shoot like), Rumble late last year completed a ground TEM programme looking for conductive EM Plates at depth which was unsuccessful due to the highly conductive overburden masking any response below 60m.
“Subsequent to the surface TEM program, a Down Hole TEM programme was completed with two deep RC holes drilled to 250m within the Calytrix Zone. The aim of the programme was to search for conductors below the conductive overburden, targeting conductive high order TEM Plates at depth which may represent high grade Au-Cu-Ag mineralisation. Two significant high-order conductors were defined within the main mineralised shear zone and were very steep dipping highlighting a strong dip component (similar to the Chibougamau Style).
“Six diamond drill holes were subsequently designed to test the DHTEM plates and along strike intersecting visual stringer Cu sulphide mineralisation in all holes, which has the potential for associated gold and silver mineralisation. The diamond drilling was co-funded by EIS government grant, and we look forward to reporting the assays when received.
“The proof-of-concept success of the DHTEM survey has indicated it will be a valuable targeting tool searching for potential high-grade Au-Cu-Ag deposits throughout the entire 15kms of strike untested.”
Amaryllis Au-Cu-Ag Prospect
The Amaryllis Prospect lies within E51/1919 and E51/1927 (100% Rumble) and forms part of the Munarra Gully Project. The Calytrix Zone lies at northern end of the Amaryllis Prospect.
Rumble has previously defined, with shallow RC drilling, a large-scale Au-Cu-Ag system over 2.3km’s in strike under shallow cover (10 to 50 metres), associated with the major north-south trending Amaryllis Shear Zone (ASZ). This mineralisation remains open to north and at depth.
Recent regional reconnaissance exploration which involved mapping and relogging all available historic drill-holes has inferred the highly mineralised, regionally extensive ASZ extends over 15km to the north under cover which remains untested by drilling.
The regional host geology consists of dacitic to andesitic extrusives and associated volcaniclastics with significant zones high-level comagmatic porphyry along with mafic intrusions and monzogranite (dykes and small bodies – related to nearby monzogranite plutons).
Calytrix Au-Cu-Ag – DHTEM Survey and Drill Program
Within the Amaryllis Prospect, the Calytrix zone has previously intersected intervals >1g/t Au and > 1% Cu associated with intensely sheared porphyritic dacitic high level intrusions. The mineralisation remains open down dip and along strike to the north.
The drilling results from a ground TEM completed by Rumble over the Amaryllis Prospect indicated strong lateral surface conductance associated with variable cover, deep weathering and hypersaline groundwater. The extensive lateral conductive (50-60m deep) layer effectively masked any ground TEM response at depth.
Results from RC drilling by Rumble outlined significant chalcopyrite-pyrite- pyrrhotite +/- sphalerite sulphide stringers within a broad (strain partitioned) shear zone with associated sericite- chlorite-muscovite-silica and ankerite-epidote-potassium feldspar-tourmaline alteration.
The host rocks are variably feldspar phyric dacitic to andesitic extrusives with minor volcaniclastics intercalated and intruded by high-level intrusive magmatic equivalent rock types. Monzogranite intrudes the dacite-andesite rocks.
The stringer chalcopyrite dominant sulphide mineralisation suggested potential for lateral (along strike) connectivity of sulphides within the primary zone hosted in the main ASZ shear zone. The inference is that the copper stringer mineralisation will be conductive, allowing for a DHTEM (Down-Hole Transient Electromagnetic) survey to identify conductive EM plates at depth which could outline potential high grade Au-Cu-Ag deposits.
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