Petratherm Limited (ASX: PTR) has defined two REE mineralised zones within the saprolite clay profile which remain open in several directions with Batch 1 drill results from the Comet Project in the Northern Gawler Craton of South Australia.
The profile remains open in several directions, while numerous Total Rare Earth Oxide (TREO) intervals have been intersected with a highest TREO value of 3,600 ppm recorded.
REE mineralisation starts at relatively shallow depths in some areas ranging from six to nine metres and importantly extends to much greater depths than previously reported. Multiple intercepts are recorded over a six to 15 metre interval and range up to 27 metres of vertical thickness.
Drilling was conducted on a 200-metre spaced grid with some 100-metre spaced and very limited closer spaced drilling in the south-eastern portion of the REE 1 Anomaly Area.
The 116 holes from Batch 1 total 3,933 metres with average hole depth of 33.9 metres. The drilling at this spacing has proved effective in locating higher-grade REE zones within the broader regionally anomalous area. The confirmation of high TREOs forming discrete mineralised zones is very promising and will be the focus for future drill targeting.
It is postulated the mineralisation may be reflecting zones of primary REE enriched basement source rock below. This opens the potential for primary REE basement targets also in the fresh rock below.
REE 1 Anomaly – South Zone – A northwest trending zone extends approximately 1000 metres and has an approximate average width of 200 metres and remains open along trend. The discrete mineralised zone shows some distinctive structural form particularly in the southern half and may be reflecting a zone of primary REE enriched basement rock below. It includes numerous thick intercepts from relatively shallow depths.
REE 1 Anomaly – Northeast Zone – A prominent zone with consistent higher concentrations of REEs extending over an approximate 1.5 kilometre by 1 kilometre area. It is open in several directions with some of the better intercepts occurring along the northern edge which remains open.
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