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The Strange Lake peralkaline rare earth deposit has an indicated resource of 189 million tonnes containing 0.934% total rare earth oxide (TREO). The ore is enriched in magnet rare earths; one tonne of ore contains 1.38 kg of Pr + Nd oxides, 0.05 kg of Tb4O7, and 0.35 kg of Dy2O3. The light rare earths are mainly hosted by parisite, allanite, and britholite, and the heavy rare earths by the silicate minerals keivite and britholite. Extensive testwork over the last 2 years has established that the ore is amenable to X-ray transmission (XRT) ore sorting. Magnet separation is able to reject about half of the feed mass with about 90% recovery of the rare earth elements (REE), and froth flotation can deliver a flotation concentrate amounting to less than 7% of the mass of ore and containing more than 50% of the REE values in the ore. Sulphuric acid baking allows recovery of about 90% of the Pr and Nd and more than 80% of the Tb and Dy. The acid bake plant will be coupled with a separation plant to recover the key magnet REE as separated and refined oxides.

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Progress on Torngat Metal’s Strange Lake Critical Rare Earth Project

  • 会议论文

  • 发表日期：

    2025年

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  • Dirk Naumann,
  • John Goode,
  • Edward Walker,
  • Danish Bilal,
  • Mikko Lyyra,
  • Navid Rohani

摘要

The Strange Lake peralkaline rare earth deposit has an indicated resource of 189 million tonnes containing 0.934% total rare earth oxide (TREO). The ore is enriched in magnet rare earths; one tonne of ore contains 1.38 kg of Pr + Nd oxides, 0.05 kg of Tb4O7, and 0.35 kg of Dy2O3. The light rare earths are mainly hosted by parisite, allanite, and britholite, and the heavy rare earths by the silicate minerals keivite and britholite. Extensive testwork over the last 2 years has established that the ore is amenable to X-ray transmission (XRT) ore sorting. Magnet separation is able to reject about half of the feed mass with about 90% recovery of the rare earth elements (REE), and froth flotation can deliver a flotation concentrate amounting to less than 7% of the mass of ore and containing more than 50% of the REE values in the ore. Sulphuric acid baking allows recovery of about 90% of the Pr and Nd and more than 80% of the Tb and Dy. The acid bake plant will be coupled with a separation plant to recover the key magnet REE as separated and refined oxides.