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Location: 21 km S from Kalbarri, Western Australia, Australia
Level 3, 14 Walters Drive, Osborne ParkPerthWestern Australia, Australia6017
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Lucky Bay comprises of the Menari and Menari North Heavy Minerals (HM) deposits. Heavy minerals at Lucky Bay are derived originally from the metamorphic rocks of the Northampton Complex, which were delivered to the coast via the Hutt River and smaller tributaries. A dominant northward-moving long-shore drift current has spread this mineral along the coast into beach and dune sequences such as the Tamala Limestone and Safety Bay Sand.The Heavy Mineral Sands are concentrated in Dune and Strand deposits. The Dune deposits typically approximate a mounded accumulation over a variable basement topography. The Strand deposits reside on a paleo wave-cut platform that is generally flat to gently-seaward dipping. The heavy mineral grade is broadly distributed in the dune sequences and enriched in the strand deposits. The mineralisation is 1.6km long and up to 750 m wide and averages 16m true thickness. The mineral envelope is generally near/at surface and is lobate in shape, pinching to the North and West. Grades generally increase from 2 % to 20 % Heavy Minerals (HM) with depth. Clay content is typically 0 % to 10 % and HM logging data indicates only minor calcite induration and coatings are associated with valuable minerals.It is most likely that the immediate and most dominant provenance of mineral at Lucky Bay results from the erosion and re-working of the Tamala Limestone and Safety Bay Sand. Heavy mineral grades are typically much higher in the strand deposits and average around 10%, whereas dune occurrences are typically half of that. The LBN deposit comprises well washed and sorted coastal sediment. Clay and Silt of the Slimes fraction are very low (5.7% on average) and typically presents as a fine, lime dust. Laboratory-determined Oversize presents as limestone cemented sand aggregates and lesser limestone chips in caprock areas, limited to older dune ridges. Whilst light (soft) cementation of dune sequences is ubiquitous, only minor penetration issues (grinding) are recorded in drill logs. Grain coatings are widespread and comprise calcium carbonate cement on, or agglomerating, HM grains.Only the Eastern and Western dunes are interpreted at LBN. There is some Eastern Strand apparent at 18200m but was not intersected elsewhere at this drill spacing. The Western Dune is poorly developed and occurs as a minor onlap in the south and north of the deposit. Grain coatings are widespread and comprise calcium carbonate cement on, or agglomerating, HM grains. Coatings are logged by mineralogist during the HM logging stage (post HLS).DimensionsThe Lucky Bay Deposits are approximately 10.7km long, 1.0 - 1.9km wide and is 27m thick on average. The lucky Bay North Deposit extends 4.2km north of the Menari North Deposit, 0.9km wide and extends to an average depth of 27m. Mineralisation occurs from surface over the majority of the deposit to a maximum of 63m depth.
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