Thomson was discovered by Sheffield in 2015 (see ASX release 23 July 2015). It is situated 12km east of Sheffield’s West Mine North deposit and 2.6km south of Iluka Resources’ Ocean Hill deposit. It is proximal to the Brand Highway and Eneabba-Dongara-Geraldton rail line, linking access to the ports of Geraldton, Fremantle and Kwinana. Thomson is located near existing mineral sands operations surrounding Eneabba. The project is situated on tenements E70/4190 and E70/4747, with mineralisation upon crown land.
Surface sampling identified a 3.7km long by 0.25km to 1.0km wide anomaly between 0.7% and 4.8% HM. This was drilled in 2015 and 2017 resulting in a JORC 2012 Code compliant Resource consisting of dunal style mineralisation and a small component fluviatile style mineralisation. This was announced on 30 January 2018 (see Sheffield's Quarterly Activities Report for the Period ended 31 December 2017)
Thomson Mineral Resource consists of an inferred 25.7Mt @ 2.0% HM with a valuable heavy mineral (VHM) of 415kt contained VHM comprising of 219kt of ilmenite, 97kt of zircon, 71kt of rutile and 28kt of leucoxene.
The dunal high grade component at Thomson is 1,600m strike length and up to 1,100m width, with an average thickness of 9m from surface to 22.5m. The underlying fluviatile component strikes 3,300m and is up to 4km width and 12m average thickness, from surface to 31.5m depth. It appears that the dunal component is sourced from denudation of the fluviatile component (see Mineral Resource and Ore Reserve Statement, ASX release 03 October 2018).
Photograph: Eneabba Project air core drilling at Thomson