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Quest Rare Minerals Ltd
Symbol QRM
Shares Issued 78,579,196
Close 2014-09-03 C$ 0.21
Market Cap C$ 16,501,631
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Quest Rare produces 98.4% TREO from Strange Lake

2014-09-04 08:34 ET - News Release

Mr. Peter Cashin reports

QUEST PRODUCES 98.4% PURITY HEAVY RARE EARTH PLUS YTTRIUM CONCENTRATE FROM AN IMPROVED PROCESS FLOWSHEET

Quest Rare Minerals Ltd. has greatly improved production of a high-purity rare earth and yttrium oxide concentrate from its new and substantially improved process flowsheet outlined in the April preliminary economic assessment press release for the Strange Lake project.

The mixed rare earth oxide was produced as part of Quest's continuing metallurgical testing program at SGS Mineral Services -- Lakefield site (SGS), and represents the successful completion of the majority of the bench-scale testing for the improved process.

Presented in the "Composition of the mixed rare earth oxide produced in recent process testing (SGS Analysis)" table is the analysis of the mixed oxide from SGS. The analysis was confirmed by a highly reputed third party laboratory, Activation Laboratories Ltd. The mixed oxide contained 98.4 per cent total rare earth oxide (TREO), of which approximately 37 per cent is heavy rare earth oxide (HREO). HREO content is a function of the HREO distribution in the mineral sample that was fed through the process. According to the Quest's production plan, higher HREO content mineralized material will be processed in the first 23 years of production, with about 45 per cent HREO expected in the final product mix.

COMPOSITION OF THE MIXED RARE EARTH OXIDE PRODUCED IN RECENT PROCESS TESTING (SGS ANALYSIS)

Oxide       La2O3    CeO2  Pr6O11   Nd2O3  Sm2O3  Eu2O3  Gd2O3  Tb4O7  Dy2O3

Analysis   13.20%  30.62%   3.33%  12.00%  1.95%  0.14%  2.70%  0.55%  3.64%

Oxide      Ho2O3 Er2O3 Tm2O3 Yb2O3  Lu2O3   Y2O3  TREO(i) LREO(ii) HREO(iii)

Analysis   0.78% 2.34% 0.33% 1.82%  0.24%  24.80% 98.40%   61.10%   37.30%  

(i) Total rare earth oxides (TREO plus Y) include: La2O3, CeO2, Pr6O11,      
Nd2O3, Sm2O3, Eu2O3, Gd2O3, Tb4O7, Dy2O3, Ho2O3, Er2O3, Tm2O3, Yb2O3, Lu2O3 
and Y2O3.                                                                   

(ii) Heavy rare earth oxides (HREO plus Y) include: Eu2O3, Gd2O3, Tb4O7,     
Dy2O3, Ho2O3, Er2O3, Tm2O3, Yb2O3, Lu2O3 and Y2O3.                          

(iii) -- Light rare earth oxides (LREO) include: La2O3, CeO2, Pr6O11, Nd2O3
and Sm2O3.                                                                  

"Quest's metallurgical team has been extremely successful in producing a high-purity concentrate, extremely low in critical impurities such as iron and aluminum. The production of this concentrate demonstrates the simplicity with which Strange Lake material can be processed into separation plant feedstock with a highly desirable rare earth distribution," said Quest president and chief executive officer Peter Cashin. "I congratulate our development team on a well-executed and successful program."

Quest's integrated Strange Lake project will fill a critical market gap in heavy rare earths. Demand for rare earth elements will continue to grow as they are used in a wide range of modern technologies, many with strong growth potential. These include e-mobility automotive, wind power and advanced lighting systems.

The supply is heavily concentrated in China, particularly for the light rare earths. China is implementing a well-defined rare earth strategy, particularly through industry consolidation into six state-owned enterprises. China is focused on supplying its internal rare earth requirements for end products for export as well as its growing domestic consumer market.

The Chinese view is that exporting rare earths in raw form is not critical to their rare earth strategy. Consequently, non-Chinese customers are expressing a strategic interest in new sources of supply to fill their growing rare earth demand and, equally important, to provide supply security and supply chain transparency. Due to the high cost of developing new sources, the most robust projects are ones such as Quest's integrated Strange Lake deposit. The operation has the potential to supply critical rare earth elements over the long term because of the size of the deposit, the mineralization style as well as its location in a mining-friendly, geopolitically stable region. Rare earth buyers are increasingly recognizing that Quest is one of the lead projects poised for production through the corporation's intensive product marketing and development efforts. Quest is currently working with potential customers and partners to realize the best opportunities for advancing the Strange Lake project to production.

Process summary

The substantially improved process flowsheet developed and tested at SGS to produce the mixed rare earth oxide concentrate, which will form the feed to the rare earth separation plant, included the following simple process steps:

  • Beneficiation (flotation), which reduced the mass of material treated by approximately 50 per cent, and results in smaller process plant footprint at Becancour and reduced energy requirements when compared with the 2013 PFS flowsheet;
  • Selective sulphation roasting and leaching, which targets recovery of REE plus Y to solution, with minimum recovery of impurity elements, including aluminum, iron and zirconium (they mostly remain in residue). The selective sulphation process greatly reduces acid consumption and drastically improves the quality of the leach solution, leading to reduced operating costs and allows for a simplified process flowsheet;
  • Impurity removal, which precipitates residual impurities from the leach solution;
  • Crude concentrate precipitation, which precipitates REE plus Y from the leach solution;
  • Final mixed concentrate production, which includes releach of the crude concentrate and final purification steps before producing a high-purity mixed rare earth concentrate.

Beneficiation

The beneficiation process is a simple flotation circuit that operates at close to ambient temperature, and uses commercially available chemicals. Approximately 50 per cent of mass can be rejected with rare earth recoveries of about 90 per cent. The opportunity to raise waste rock mass rejection and potentially further decrease the size of the Becancour process plant, as well as lower the logistics costs associated with transportation of flotation concentrate, is currently under evaluation.

Hydrometallurgy

Quest's improved hydrometallurgical process can produce a high-purity mixed rare earth oxide without technically complex, risky and costly solvent extraction circuits. The key process step in the new process is the selective thermal sulphation process. By careful control of key process parameters, the recovery of REE to solution can be maximized while Al, Fe, Zr and other impurities are rendered insoluble, and the acid level of the leach solution is minimized. High levels of acid and impurities in solution represent a major technical and economic challenge for many projects. By leaving the impurities behind in the leached residue and minimizing free acid in the leach solution, the flowsheet is dramatically simplified -- with reductions in acid consumption, neutralizing agent consumption, process plant footprint, energy consumption, and the quantity and quality of residue for disposal. Also of note is the fact that silica in Quest's minerals is not attacked by sulphuric acid, resulting in straightforward liquid solid separation steps.

REE recovery from flotation concentrate to leach solution is approximately 87 per cent in the new process.

Following sulphation and water leaching, the remaining process steps are primarily simple precipitation and filtration stages using off the shelf equipment and relatively low-cost reagents. Impurities are selectively precipitated from solution with minimal REE losses. A crude rare earth concentrate is produced by precipitation. The crude concentrate is then purified to produce the final mixed rare earth concentrate feed to the separation plant.

The final precipitation of the high-purity mixed rare earth concentrate uses oxalic acid, which precipitates the rare earths as oxalates. The mixed rare earth oxalate is calcined to produce the high-purity oxide. Options to further improve the purity of the mixed rare earth concentrate are being evaluated.

Continuing and future metallurgical programs

Quest is continuing to optimize the process flow sheet and evaluate opportunities for improvement in the beneficiation and hydrometallurgical processing stages. Continuing and further metallurgical work includes the following:

  • Continued evaluation of sensor-based ore sorting (radiometric, photometric) at Helmholtz Institute in Freiberg, Germany (evaluating potential of sensor-based ore sorting as the first step in mass reduction);
  • Optimization of the flotation circuit and evaluation of reduced mass pull (which may further decrease the size of the Becancour, Que., processing plant, and offer potential reductions in CAPEX and OPEX);
  • Mini-pilot plant operation of the hydrometallurgical circuit at SGS to confirm results of bench scale program and optimize operating parameters;
  • Beneficiation piloting (for sensor-based sorting and or flotation circuits);
  • Full-scale integrated piloting.

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