The South Pass Lithium Project comprises of 206 unpatented mining lode claims covering an area of 4,258 acres and is located near the Wind River Range, Fremont County, Wyoming, USA. South Pass City is the closest town, situated ~1.5km east of the Project area.
The major town of Lander is ~50km North and Central Wyoming Regional Airport located ~70km north east which has daily jet services. The South Pass Lithium Project is easily accessible via a network of major and unsurfaced roads, with State Highway 28 (WY-28), a communications tower and power lines are all within the Project area. Terrain is highly favourable being relatively undulating with limited vegetation.
The South Pass Lithium Project is a large, early stage and highly prospective exploration project with favourable geological characteristics. These include outcropping pegmatites and dykes that occur in large swarms which have the potential to contain lithium bearing Lithium Caesium Tantalum (LCT) pegmatites. This potential is based on historical lithium mineral reports and lithium detected in historical regional multi element chemical sampling.
Extensive exposures of outcropping pegmatites are visible from satellite imagery, including in Google earth and were confirmed during field reconnaissance. Pegmatites were observed up to several hundred metres long in the vicinity of nearby faults and the South Pass greenstone belt. Similar pegmatites in the district have been found to be enriched in columbite, tantalite, microline, tourmaline, beryl and garnet, with accessory minerals including lithium bearing lepidolite and spodumene, which illustrates the potential for pegmatites within the South Pass Lithium Project to be fertile for lithium mineralisation.
There has been no or little prior recorded systematic exploration for LCT pegmatites in the South Pass area and scant prior work was limited to regional mapping and sampling, mainly focussed on gold occurrences.
Prior reported spodumene and lepidolite occurrence was noted by gold geologists from the northern area of the South Pass Lithium Project where small scale prior pegmatite mining has taken place. Uvre has not yet confirmed the historical spodumene or lithium mineral occurrence as no on ground exploration has yet taken place by the Company.
The presence of numerous pegmatite outcrops alongside dykes and granites suggests that the deeper crust may harbor a mixture of rocks derived from the mantle. This mixture appears to be mature enough in its development to host lithium and comprise LCT pegmatites.
The Project is located in the Wind River Mountains area, an Archaean basement inlier uplifted during the Laramide Orogeny. In the general South Pass area, approximately half of the Project region is underlain by Precambrian granitic and gneissic rocks that are about 2.7 billion years old. The other half is underlain by a large pendant of Precambrian metasedimentary and metavolcanic rocks that are older than the granite. Previous explorers were focused on gold exploration in these rocks. The elevation ranges circa 2100-2400m above sea level.
The geology of this area is known to host abundant pegmatite swarms. Approximately 50% of the Project area is believed to be Archean granites and pegmatites. The pegmatites are highly variable, occurring in both the granite and country rocks. Individual pegmatites’ size ranges vastly, from a few meters in width and length to significant pegmatite bodies that are several hundred meters wide and several kilometers long.
The geology of the Project area is well documented in a Geological Survey Report titled “Geology of the South Pass Area”5 where the authors note “At least five mineralogical types of pegmatites have been observed comprising (1) magnetite; (2) graphic granite; (3) tourmaline-garnet, consisting of (a) very course grained garnet-tourmaline-beryl and (b) tourmaline-garnet; (4) garnet; and (5) biotite. Some minerals found in small quantities include arsenopyrite, columbite-tantalite, beryl, lepidolite, spodumene and sky-blue tourmaline”. This mineral assemblage confirms the lithium fertility of the pegmatites in this region and potential for LCT fertility.
Systematic exploration at the South Pass Lithium Project has begun with geological mapping of the pegmatites, in conjunction with rock chip sampling aimed at confirming the historical occurrence of spodumene and lepidolite as sited in the 1965 Geological Survey Report on the Project area.
Presuming confirmation of lithium bearing minerals and favourable pegmatite compositions, this work will most likely be followed by soil sampling in conjunction with the interpretation of airborne datasets to define pegmatite distribution and LCT fertility before planning an initial drill program.