Reung Kiet
Lithium Project

Trenching and diamond drilling at the old Reung Kiet mine has also already been completed along with sighter beneficiation test-work. These programs have consistently delivered highly encouraging results

The Reung Kiet Lithium Project is located about 70km north-east of Phuket in the Phang Nga Province in southern Thailand. Pan Asia holds a 100% interest in 3 contiguous Special Prospecting Licences (SPL) covering about 38km².

Previous Mining and Exploration

The project area was part of a major tin mining region up until the mid-1980s. There is little detailed information available regarding previous exploration and mining in the project area. Up to the late 1980s southern Thailand was a globally significant tin producer. In the Phang Nga Province from 1965 to 1990 recorded tin concentrate production was approximately 300,000 tonnes. Much of the tin production was derived from alluvial or offshore sources, however, there were some primary deposits being mined.

In the late 1960s a joint Thai/British Geological Survey study was undertaken in the region (Garson et al, 1969). It was during this study that the lithium bearing mineral lepidolite was identified in weathered pegmatites that were being mined for tin at the Reung Kiet and Bang I Tum open pit mines as well as at other mines in close proximity.

The 1960s study conducted geological mapping, geochemical analysis and mineralogical descriptions of various tailings, concentrate and rock samples as well as lepidolite beneficiation studies. The lepidolite was found to contain 3-4% Li2O. With significant focus on two key tin mines, Reung Kiet and Bang I Tum, the survey stated:

  • “the pegmatites at Reung Kiet and Bang I Tum may well be the largest un-zoned lepidolite pegmatites yet recorded”; and
  • “lepidolite is fairly evenly distributed both along the length of the pegmatite and from wall to wall. In places there is local enrichment of massive lepidolite”

There is little recorded exploration activity in the project area since the 1960s study.

Geology and Mineralisation

The Reung Kiet Lithium Project is situated in the Western Province of the Southeast Asian Tin – Tungsten Belt. In the project area Cretaceous-Tertiary aged granites intrude older sedimentary rocks of the Phuket Group comprising interbedded mudstone-sandstone. Lithium mineralisation is associated with lepidolite rich pegmatite dykes and veins which intrude the Phuket Group sediments along the north-east trending Phang Nga Fault Zone. The lepidolite rich pegmatites belong to the LCT (Li-Cs-Ta) family as defined by London, 2008. The pegmatites are chiefly composed of quartz, albite, lepidolite with minor cassiterite and tantalite as well as other accessory minerals including some rare earths.

Pan Asia’s Work

In early 2019 Pan Asia was granted three SPLs covering about 38km². Up until more recently Pan Asia has undertaken soil, rock chip and stream sediment sampling in conjunction with geological mapping, pit surveying and preliminary mineralogical studies. Trenching and diamond drilling at the old Reung Kiet mine has also been completed along with sighter beneficiation test-work. These programs have consistently delivered highly encouraging results. The main focus of the work has been at the Reung Kiet Prospect in the south of the project area and the Bang I Tum prospect about 10km to the north. Additional reconnaissance exploration has been undertaken more broadly across the project area.

The Reung Kiet Prospect

The Reung Kiet prospect is focused on the old open pit which is about 500m long and up to 120m wide. Mining extended to about 25m below surface, where the pegmatite became too competent to mine by the hydraulic methods employed. Much of the pit is now filled with water to a maximum depth of about 10m.

Pan Asia initially conducted soil and rock chip sampling and defined lithium rich zones in soils and rock-chips to the southwest of the pit along strike, and extending to the east. Lower level lithium in soil anomalies were also located north of the pit, see Figure 18 – “Reung Kiet Lithium Prospect”. Follow-up programs included wide spaced diamond drilling (5 holes for 588m) targeting the pegmatite beneath the open pit. Trenching and rock-chip sampling focused on an area extending for 500m southwest of the pit.

Drilling identified the Main pegmatite is up to 35m wide and contains variable lithium grades along with accessory tin and tantalum. Better results include: RKDD001; 6.3m @ 0.65% Li2O from 66m and 5.8m @ 0.73% Li2O from 80m. RKDD002; 15.6m @ 0.82% Li2O from 55m, including 9m @ 1.00% Li2O.

The trenching and sampling conducted south of the pit has identified numerous lithium rich pegmatite dykes in a swarm up to 90m wide, with individual dykes from 1-7m wide. The results indicate a prospective strike length of around 1km for the Main trend. An Eastern trend has also been identified.

Trench sampling, outcrop and float sampling has yielded 148 samples at >0.5% Li2O with average grades of 1.41% Li2O. Mineralogical studies indicate the mineralised pegmatite contains between 25-45% lepidolite, and the lepidolite generally contains 3.5-4.5% Li2O.

Sighter metallurgical test-work on weathered pegmatite samples from trenches and rock-chip indicates 93.6% Li recovery to a rougher concentrate grading 2.76% Li2O.

The Bang I Tum Prospect

The Bang I Tum prospect was a relatively large open cut tin mine. The old pit is about 650m long and up to 125m wide. Mining of the weathered pegmatites extended to about 30m below surface, to top of hard rock.

The mined pegmatite is recorded to be up to 25m wide (Garson, 1969). The pit is now water filled, with water depths to a maximum 15m. Additional smaller scale mining extended further along strike to the southwest. Soil and rock-chip sampling has defined the Main trend and an Eastern trend. The prospective Main trend is about 1.5km long. Rock chip sampling has yielded 14 of 24 samples >0.5% Li2O, with average grade of 1.23% Li2O plus accessory tin and tantalum. A lepidolite pegmatite dyke swarm can be observed on a hill about 400m south of the pit. This swarm is up to 100m wide with individual dykes up to 7m wide.

The Eastern trend is about 1.5km long, located approximately 350m east of, and parallel to the Main trend.

Pan Asia’s 2021 Drill Program at Reung Kiet Lithium Project

In early calendar 2021, Pan Asia started a drilling program at its Reung Kiet Lithium Project in southern Thailand. Following the completion of the priority one holes at Bang I Tum, Pan Asia intends to relocate the rig to the nearby Reung Kiet prospect to conduct additional drilling that will target lepidolite rich pegmatites identified in previous trenching and mapping programs conducted by the Company.