Riversgold Limited (ASX: RGL) has obtained high-grade assay results from the field campaign recently completed at its Tambourah Lithium Project in the Pilbara, Western Australia.
The mapping programme covered approximately 11 sq. km (~4% of the Tambourah Project), focusing on two km of the approximately 12 km of the western granite/greenstone contact under tenure. No work was conducted on the additional 22km of strike of the eastern granite greenstone contact.
A total of 57 rock chip samples were collected, covering a range of geological settings, prospective for economic mineralisation including 29 samples specifically for lithium mineralisation.
Over the course of two weeks in late April, the RGL team conducted a mapping and surface sampling campaign at the recently granted and acquired Tambourah Lithium Project located 160km south of Port Headland.
RGL’s geologists have identified at least two generations of pegmatite dykes in the area. A first generation (G1) pegmatite dyke, composed of quartz, feldspar, muscovite, and a series of other secondary minerals, does not display obvious lithium bearing minerals.
G1 dykes are thicker and more prevalent in the topography. The G1 dykes are mostly parallel to the granite/greenstone contact of which RGL controls 12km of strike.
Second generation pegmatite dykes (G2) have been identified cross cutting the G1 pegmatites and contain lithium bearing minerals, in particular lepidolite which is easily identified by geologists in the field.
On RGL’s tenure, the G2 dykes develop along two main structural directions, N030 at Bengal and N125 at Ragdoll and Lion. A total of 49 samples of pegmatites were collected: 20 of the G1 pegmatites, and 29 of the G2 pegmatites.
G1 pegmatites samples were collected with the view to analyse their composition in certain trace elements to find out whether the G1 and G2 pegmatites are related
Grade is king, and the results from our Lion Prospect at Tambourah, with an average grade of 2.24% Li2O and a maximum of 3.14% Li2O, are outstanding,” CEO, Julian Ford, said.
“We are encouraged by the scale of the Tambourah Project, as the Lion, Ragdoll and a new prospect to the north extend now for over 800 metres along the granite contact.
“Our understanding of the lithium mineralisation is improving with each site visit, and we are encouraged by MRR’s success next door.
“We have only just started exploring Tambourah’s potential following notification of granting three weeks ago.
“The lithium mineralisation discovered to date represents just a very small part of the overall tenement potential, with the majority of the tenement still to be explored over the coming months.
“Our focus to date has been around the western granite/greenstone contact and we see great potential for our pegmatites to extend further along approximately 34km of contact – west and east – and to extend well into and under the greenstones.”