Global Geoscience Progressing PFS at Rhyolite Ridge

THE DRILL SERGEANT: Global Geoscience (ASX: GSC) provided an update on progress of a Pre-Feasibility Study (PFS) underway at the company’s 100 per cent-owned Rhyolite Ridge lithium-boron project located in Nevada, USA.

The recent S&P/ASX 300 Index-invested company is working with Amec Foster Wheeler on the PFS.

Global Geoscience explained the current work is being carried out in two phases.

The first being a definition phase, including trade-off studies, to identify the major process and infrastructure components required.

The second is a pre-feasibility phase involving both design and estimating.

According to the company the PFS work is progressing well and in accordance to plan and it expects to provide further updates on its progress over the coming weeks regarding:

PFS trade-off studies;
Preliminary site layout and environmental permitting;
Further optimisation of the acid-leach process; and
Crystallisation and purification of the lithium and boron end products.

“We are delighted with the rapid progress of our unique Rhyolite Ridge lithium-boron project in Nevada, and this has now been reflected in our inclusion in the S&P/ASX 300 Index,” Global Geoscience managing director Bernard Rowe said in the company’s announcement to the Australian Securities Exchange.

“The Rhyolite Ridge PFS is progressing well under the direction of Amec Foster Wheeler.

“The unique mineralogy and chemistry of the Rhyolite Ridge mineralisation continues to provide many attractive options which consistently point to low-cost processing and high recoveries of lithium and boron.

“Phase one of the PFS includes trade-off studies to select the most favourable processing and infrastructure alternatives.

“Key aspects of this work have been to evaluate and compare the various leaching options – heap, vat and agitation (tank) leaching and on-site production of sulphuric acid.”

Global Geoscience declared the Rhyolite Ridge mineralisation is ideally suited to open pit mining methods as it is shallow, thick and gently dipping, resulting in a low strip ratio.

Simple, low-cost acid leach processes can be used to extract lithium and boron at high recovery rates into a Pregnant Leach Solution (PLS).

Lithium and boron can then be removed from the PLS through crystallisation and purification steps to produce lithium carbonate or lithium hydroxide and boric acid at the mine site.

The company considers the ability to produce lithium and boron end products on-site from a hard-rock source makes Rhyolite Ridge a unique development opportunity.