The REEs are primarily contained in the minerals yttrofluorite, cerofluorite, and bastnaesite
, which are very fine-grained and disseminated throughout the rhyolite mainly in microfractures, voids, and coatings on predominantly alkali feldspar phenocrysts.
The Reserve will be reported according to the 2012 JORC Code and Guidelines and will be centred on the weathered Bastnaesite
Zone portion of the greater Ngualla rare earth deposit that is targeted for first production.
The REEs at Ashram occur in simple and well-understood mineralogy, being primarily in the mineral monazite and to a lesser extent in bastnaesite
The weathered Bastnaesite
Zone is now a high confidence, well defined Mineral Resource with 86% in the highest 'Measured' JORC category
3 tonne bulk sample of weathered Bastnaesite
Zone mineralisation from Ngualla using the simple sulphuric acid leach recovery process.
0% lower grade cut the Mineral Resource for the Bastnaesite
Zone weathered mineralisation targeted for initial development is:
3 tonne bulk sample of Ngualla weathered Bastnaesite
Zone mineralisation using the simple sulphuric acid leach recovery process.
The high-grade mineral concentrates currently being produced from Ashram are a direct result of the simple rare earth mineralogy of the deposit consisting of monazite, bastnaesite
, and xenotime.
Peak has updated the December 2012 Scoping Study and preliminary economic assessment to reflect the significant improvements in costs and option to increase production as a result of recent positive beneficiation test work results and a higher grade and increased Mineral Resource for the weathered Bastnaesite
Zone at Ngualla.
The high-grade mineral concentrates result from the Ashram Deposit's simple rare earth mineralogy consisting of monazite, bastnaesite
, and xenotime.
The infill drilling was completed to increase the amount of weathered mineralisation in the Bastnaesite
Zone classified as 'Measured' or 'Indicated' Mineral Resource and provide the definition required for a detailed mine plan and schedule for the project to support the Pre-Feasibility Study now in progress.
This process involves known and conventional techniques common to the simple rare earth mineralogy of Ashram (monazite, bastnaesite
, and xenotime), in which the mineral concentrate is dissolved in sulphuric acid.
Junmei Zhao, on behalf of her colleague, Deqian Li, of the Changchun Institute of Applied Chemistry in China, detailed a method for the extraction of cerium from bastnaesite
, one of the many rare earth bearing minerals found in the Nechalacho ore, using reagents developed by Cytec Canada.
The rare earth elements at Ashram occur in simple and well-understood mineralogy, being primarily in the mineral monazite and to a lesser extent in bastnaesite
Currently, the deposit's geometry and geology can best be described as a moderate to steeply NE dipping ovoid or sheet, with simple rare earth mineralogy (monazite, bastnaesite
, xenotime) yet texturally complex with multiple episodes of dolomitic carbonatite emplacement, brecciation, and low temperature (hydrothermal) overprinting.