Rare Element Reports Rare-Earths Drilling and Metallurgical Test Results
TSX-V: RES
Metallurgical testing during 2008 made significant strides forward, but additional work needs to be done. Rare-earth ores are difficult to treat in the best of situations, and the Bear Lodge mineralization is no exception to this rule.
Drilling Results
The rare-earth mineralization encountered in three of the four drill holes is primarily contained within the near-surface oxidized equivalents (FMR) of carbonatite dikes that intrude a body of heterolithic intrusive breccia along the southwest flank of Bull Hill, within the Bear Lodge alkaline-igneous complex. REE assay values are reported by convention as the combined oxide equivalents (REO) of the fifteen elements in the series. The oxide equivalents are approximately 15.6% higher than the combined metal assay values. The Bear Lodge project contains predominantly the “light” REE (lanthanum, cerium, praseodymium, neodymium, samarium, europium, and gadolinium), and in particular the first four of these. Assays from the REE-mineralized sections of the holes are summarized in the table below.
Drill-hole RES 08-1
(bearing N 45 degrees E, inclination -45 degrees, total depth 904 feet,
Bull Hill Southwest extension target)
-------------------------------------------------------------------------
Interval Intercept True Thickness Mineralized Lithology Total % REO
-------- --------- -------------- --------------------- -----------
(feet) (feet) (feet)
410 - 485.5 75.5 54.3 FMR dike 4.86%REO
-------------------------------------------------------------------------
Drill-hole RES 08-2
(bearing N 45 degrees E, inclination -45 degrees, total depth 1054 ft,
Bull Hill Southwest target)
38 - 163 125 52.8 FMR dike 2.46%REO
273 - 386 113 68 FMR dike 3.42%REO
-------------------------------------------------------------------------
Drill-hole RES 08-3
(bearing N 45 degrees E, inclination -45 degrees, total depth 994 ft,
Bull Hill Southwest target)
22 - 215 193 170 FMR dike 4.12%REO
480 - 489 9 7.9 FMR dike 15.28%REO
967 - 988 21 7.2 Carbonatite dike 2.89%REO
-------------------------------------------------------------------------
Drill-hole RES 08-4
(bearing S 60 degrees W, inclination -60 degrees, total depth 1886 ft,
East Taylor Bowl target)
866 - 886 20 14 Carbonatite dike 2.27% REO
-------------------------------------------------------------------------
Assaying of the rare-earth elements was conducted by Activation Laboratories (ActLabs) in their
“We are pleased with the results of our rare-earth drilling and continue to advance the project with a continuation of the metallurgical testing program to determine a feasible method of concentrating the rare-earth-bearing minerals,” states President
Metallurgical Testing
The most recent phase of metallurgical testing continued through 2008 to determine the technical feasibility of recovering the rare-earth values from the Bear Lodge mineralization. Initial efforts were directed toward preconcentration to upgrade REE values prior to the use of higher cost hydrometallurgical procedures. These preconcentration techniques included gravity concentration (jigs, tables, spirals, etc.), heavy media separation (HMS), and flotation.
The results of preliminary preconcentration (upgrading) tests by physical separation processes on the unoxidized REE-mineralized material indicates that a reasonable sink-float separation is technically feasible under the best test condition of -3/8-inch crush size and a liquid density of 2.85 g/cm(3). Results of this test indicate an overall recovery of about 80 percent in the preconcentrate within about 50 weight percent of the original material. This preconcentrate was then further treated by the flotation process to recover the sulfide fraction as a potential source of H(2)SO(4) required in the hydrometallurgical treatment of the preconcentrate to recover the REE values. Using the leaching concept, it is technically feasible to obtain a recovery of about 84 percent from the preconcentrate or an overall recovery of about 67 percent from the original mineralized material. Testing of the transitional (unoxidized + oxidized) material gave slightly lower overall recoveries.
Rare- earth ores are difficult to treat in the best of situations, and the Bear Lodge mineralization is no exception to this rule. Through a careful program of research and development at the Mountain States R & D International laboratory, additional preconcentration testing will be conducted to find a technique to further upgrade the REE values, and leach testing the preconcentrate with heat and additional leach time is expected to raise the REE extraction above 90 percent.
The Company will select samples from the 2008 core drilling program for further metallurgical study and testing. Beneficiation tests will be conducted on oxidized, and unoxidized, rare-earth mineralized carbonatite samples to determine the feasibility of producing commercial rare-earth products.
Rare Element Resources Ltd (TSX-V:RES) is a publicly traded mineral-resource company focused on gold and rare-earth elements. In addition to the REE exploration and evaluation efforts, the Company and Newmont have entered into the
ON BEHALF OF THE BOARD
Donald E. Ranta, PhD, PGeo, President & CEO
SOURCE Rare Element Resources Ltd.
