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Great Western Minerals Group Ltd. is a Saskatchewan-based junior exploration company. GWMG is engaged in the acquisition, exploration, and development of rare earth mineral properties in North America.

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Message: Hoidas Lake

Hoidas Lake

posted on Sep 07, 2009 08:08AM

Hoidas Lake is far ahead of most deposits as why Toyota wants to secure Rare earth metals production .

EXPLORATION AND DEVELOPMENT

GWMG's exploration programs to date include

  • trenching,
  • geological mapping and prospecting,
  • geophysics,
  • bulk sampling, and
  • diamond drilling (92 holes/8526 m to date).

These have established continuity of the JAK Zone over a length of 750m to a depth of 150 m, with widths from 3 to 12 m. The Zone is open to the NE and SW and at depth.

Wardrop Engineering Inc. completed a 43-101-compliant Resource Model and Technical Report (based on 70 drill holes), concluding:

"It is recommended that the present course of action by Great Western Minerals Group be continued, with a focus on metallurgical work for the development of a suitable product for consumption, by its subsidiary, Great Western Technologies."

Resources Estimate

Resources estimated by Wardrop, using a 1.5% total rare earth oxide (TREO) cutoff grade, are:

Category Tonnes TREE* + Y (WT.%) TREO + Y (WT.%)
Measured 123,000 2.466 2.956
Indicated 430,000 2.305 2.762
Inferred 812,000 2.039 2.445
* Total Rare Earth Elements

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Historical Results

Originally discovered in the 1950s as a direct result of post-WWII uranium exploration, the Hoidas Lake property covers more than 30 known rare earth showings situated along a fault structure with a ten-kilometre strike length.

This structure is part of the Black Bay Fault system, a major geological feature that runs for 50 kilometres, southwest to Uranium City. These showings have never been investigated for their rare earth potential until recently, and only one showing (the JAK Zone) has seen any serious exploration work.

Initial trenching on the JAK Zone, carried out by GWMG in 1999, confirmed the presence of significant rare earth element mineralization. Drilling commenced in 2001 and, by 2006, 70 drill holes had been completed in the JAK Zone. From the outset, drill holes were collared on 25-metre centres, with the goal of establishing sufficient resources to merit starting a preliminary economic assessment report as quickly as possible.

Results from the first 70 drill holes are summarized in the resources estimate from Wardrop Engineering.

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Current Work Reports

In 2006, 22 drill holes totaling 2,233 metres (in addition to the initial 70 drill holes) were completed in, and adjacent to, the JAK Zone. This latest drilling was concentrated in the northern portion of the JAK Zone as recommended by Wardrop Engineering. This portion of the JAK Zone covers 325 metres of strike length, with the mineralized veins exhibiting excellent widths and grade to depths of 125 metres below surface.

Over 700 samples have been submitted to the Saskatchewan Research Council in Saskatoon for assay. Each sample is assayed for 37 individual elements including the 15 rare earth elements.

Drill Results

Each drill hole, drilled at an angle to the west, intersected one or more of the mineralized veins. The following table reports the assay results for the vein intersections from the latest 15 drill holes on the JAK Zone:

Drill Hole No. (° Dip)Grid LocationIntersection
True Width (m)Average Assay
% TREO*Intersection
Depth From
Surface (m)
HL06-71 (-54) 2+50N 60E 1.94 1.19 30
7.73 1.79 85
HL06-72 (-54) 3+75N 05E 1.77 2.89 4
9.80 2.25 25
incl 5.10 3.51
HL06-73 (-55) 3+50N 05E 0.96 1.69 10
6.31 1.83 25
HL06-74 (-61) 3+75N 50E 2.94 2.37 40
7.66 2.20 90
HL06-75 (-61)/td> 4+25N 10E 2.57 2.64 45
7.22 3.49 60
incl 5.31 4.04 &mdash
HL06-76 (-60) 4+50N 15W 9.01 4.48 30
incl 6.40 5.51
5.49 1.86 45
HL06-77 (-60) 4+50N 25E 9.05 1.66 15
4.37 2.15 65
HL06-78 (-59) 4+25N 75E 2.89 0.42 60
HL06-79 (-60) 4+75N 25W 2.68 2.64 10
4.37 3.44 20
HL06-80 (-62) 4+75N 20E 3.94 2.31 60
4.54 3.83 70
HL06-81 (-63) 5+00N BL 4.53 1.57 45
5.45 1.80 60
HL06-82 (-63) 5+25N 10W 6.00 3.69 30
6.71 3.27 45
incl 4.62 4.37
3.23 6.65 65
HL06-83 (-63) 5+50N 30W 2.14 3.96 50
HL06-84 (-61) 5+75N 20W 12.86 2.49 50
incl 7.28 3.36
HL06-85 (-63) 4+50N 65E 7.93 2.76 90
6.29 2.52 105
incl 2.94 5.01
16.77 2.01 125
incl 4.86 3.38
*Total Rare Earth Oxide

The drilling in this area shows an increase in the number of vein intersections greater than 4 or 5 metres in width, and in the number of complete intersections grading over 3% TREO, with wide higher-grade sections, within the veins, of 5% and 6% TREO.

Preliminary Economic Assesment Report

As a result of Wardrop Engineering's recommendations from their March 43-101-compliant resource estimate, a Preliminary Economic Assesment Report has been commissioned. The initial base case premise of the study will be construction of a 500-tonne-per-day mine-and-mill complex with a 20-year mine life.

Wardrop Engineering will be responsible for

  • updating the mineral resource estimate;
  • selecting the mining method and developing the general mine plan;
  • locating the processing plant and related plant services;
  • transportation plans and routes;
  • pre-production capital cost estimates;
  • operating cost estimates;
  • economic model development and defining the mineral reserve;
  • evaluating the possible alternatives under the previous categories; and
  • project implementation and recommendations.

Golder Associates will look after

  • a social economic review;
  • environmental management plan;
  • permitting, geotechnical and rock mechanics considerations;
  • waste management design; and
  • reclamation plans.

Melis Engineering Ltd. is responsible for defining

  • the processing method;
  • a conceptual flow sheet; and
  • consumables

related to processing the Hoidas Lake material.

Metallurgy

Metallurgical test work on the Hoidas Lake mineralization is now being finalized at Lakefield Research in Ontario, under the direction of Melis Engineering Ltd.

The REEs at Hoidas Lake are hosted in the phosphate mineral apatite and the silicate mineral allanite. Previous work identified three possible flow sheets for mineral processing of the rare earth minerals and demonstrated that the mineral assemblages are amenable to acid leaching.

Recent work has focused on exploring whether the rare earth values can be upgraded during beneficiation using techniques such as flotation as a possible process step ahead of the hydrometallurgical extraction (leaching). Results have confirmed that the phosphate (apatite) can be separated from the silicates (allanite) by flotation.

Further flotation tests are now underway, as well as exploration to determine whether heavy liquid separation and magnetic separation could be useful in beneficiation.

Hydrometallurgical testing will be initiated to determine the extraction efficiencies of the different lixiviants (both acids and bases) on the different concentrates, tails and "whole ore".

Golder Associates, environmental managers on the project, have completed the majority of the environmental baseline fieldwork. The first round of informational public meetings in the impact communities around Hoidas Lake has also been completed under the direction of Golder.

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Outlook

GWMG'S goal is to provide 10% or more of the US demand for REEs by 2011. This means the potential for annual gross revenues of US$100 million.

To meet this goal, GWMG is aggressively completing process design, engineering, and environmental work in order to complete a Final Feasibility Study. GWMG has also initiated a program of discussions with local stakeholders to encourage community involvement. On the marketing side, GWMG has incorporated

Great Western Technologies Inc. (GWTI) and has purchased specialty metal production and processing facilities in the US from Energy Conversion Devices Inc. (ENER-NASDAQ). These facilities are capable of producing material for use in NiMH rechargeable batteries, for the hybrid vehicle market. Having these facilities will also help to establish manufacturing and marketing alliances in the specialty metals area before the Hoidas Lake project goes into its processing phase

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