Verplanck, P.L. and Van Gosen, B.S. (2011) Carbonatite and Alkaline Intrusion-Related Rare Earth Element Deposits—A Deposit Model: U.S. Geological Survey Open-File Report 2011-1256, 6 p.
https://doi.org/10.3133/ofr20111256

has been cited by the following article:

• TITLE: Flotation-Calcination-Magnetic Separation Hybrid Process for Concentration of Rare Earth Minerals Contained in a Carbonatite Ore

  AUTHORS: Tesfaye Negeri

  KEYWORDS: Flotation, Calcination of Rare Earth Flotation Concentrate, Magnetic Separation

  JOURNAL NAME: Journal of Minerals and Materials Characterization and Engineering, Vol.9 No.3, May 27, 2021

  ABSTRACT: A hybrid process consisting of flotation and magnetic separation has been developed to concentrate multi-phase rare earth minerals associated with a carbonatite ore that contains a significant amount of niobium. The deposit is known to contain at least 15 different rare earth minerals identified as silicocarbonatite, magnesiocarbonatite, ferrocarbonatites, calciocarbonatite, REE/Nb ferrocarbonatite, phosphates and niobates. Although no collector exists to float all the different rare earth minerals, the hydroxamic acid-based collectors have shown adequate efficiency in floating most of these minerals. 92% recovery of total rare earth oxide (TREO) and niobium in 45% mass was possible at d80 of