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Prominex JV receives Tulks Hill pretreatment results

2008-09-25 17:04 ET - News Release

Also News Release (C-RRO) Royal Roads Corp

Mr. Lorne King of Prominex reports

PROMINEX & ROYAL ROADS REPORT RESULTS OF PRE-TREATMENT TRIAL TEST ON TULKS HILL BULK SAMPLE

Prominex Resource Corp., together with Royal Roads Corp., has received initial results for pretreatment tests on a composite bulk sample from the T-3 lens within the Tulks Hill project in central Newfoundland. This project is a joint venture between Prominex (51 per cent), and Royal Roads (49 per cent) and is operated by Prominex.

E&P Associates of Yorkshire, England, was retained to conduct a gravity and magnetic pretreatment study at a pilot plant owned and operated by Clemente Roman SL in Segovia, Spain. This test was carried out based on a recommendation in the NI 43-101 technical report dated July 22, 2008, prepared by Scott Wilson Roscoe Postle Associates Inc.

In modern-day mineral processing, gravity and magnetic separation are two means by which certain minerals may be separated from waste rock prior to froth flotation. Pretreatment can be used in conjunction with froth flotation or as the main treatment facility, depending on the mineralogy of the bulk sample. The previous testwork completed by Lakefield Research (1998) had concentrated on separation by froth flotation. Scott Wilson Roscoe Postle and Associates references the positive results from this test in the NI 43-101 technical report.

In 1998, Paul O'Brien, BSc, PEng, Prominex's vice-president of exploration and development, supervised the extraction of a five-tonne representative composite bulk sample (T1, T2 and T3) from the Tulks Hill property. Lakefield Research conducted metallurgical testing on two tonnes. The accompanying original sample assay results table shows the assay results from the six 50-kilogram samples that were tested in Spain. Mr. O'Brien supervised the samples selected for this test and he has maintained a strict chain of control of the bulk sample since 1998.

                     ORIGINAL SAMPLE ASSAY RESULTS

Sample No.              Cu %     Pb %     Zn %       Ag g/t       Au g/t

1                       0.78     3.90     13.3        130.1        1.067
2                       0.70     2.80     10.6         74.3        0.843
3                       1.26     5.10      9.0        123.3        1.379
4                       0.99     5.10     11.2        126.7        1.037
5                       1.54     3.90     11.6        113.0        1.232
6                       1.43     2.70      3.6         41.4        0.704
                       ------   ------   ------      -------      ------- 
Total sample (average)  1.12     3.92     9.88        101.5        1.044

The pilot plant procedure was carried out on samples 1, 2 and 3 in three independent stages. First, all material was jaw crushed. Following this, the jaw crusher product was passed over a screen fitted with 1.5-millimetre panels. Material passing through the screen was stockpiled for testing. Oversized material was fed to a small hammer mill and was recycled to the screen until the entire sample had passed the screen. Sample 1 was used for ranging shots in preparing the facility for the process. Finally, in stage 3 the sized bulk sample was fed to a slurry pump that transferred the material to the spiral. Initially the products were returned to the pump in a closed circuit until the spiral settings had been adjusted correctly. The products were then collected in plastic containers. The spiral products were then rewashed and the subsequent products were passed over a magnetic separator and Eastern Analytical of Springdale, Nfld., analyzed the final products. The above procedure is being carried out on samples 4, 5, and 6. These results will be released when completed.

The main reason for carrying out the pilot plant study on the bulk sample was to determine whether a significant percentage of low-density material could be removed without incurring a major loss of metal from the feed by gravity separation. Magnetic separation is another form of pretreatment if the bulk sample is amenable to it. The overall results are found in the accompanying table.

From the samples provided it was shown that using an impact-type crusher the natural fines produced represented 21.7 per cent of the total feed. A hammer mill was used for the final stage of bulk sample reduction because in certain cases the action of this type of mill can assist in liberating the more friable sulphides from the tougher host rock. In addition, quite often the fines generated below the range of gravity treatment contain higher metal values.

In this case, both zinc and silver levels were significantly higher in the minus 75 micro m fines than in the original feed. This could reduce the necessary ball milling requirement by the same percentage. Previous flotation work carried out on the bulk sample had indicated that adequate liberation takes place at this size range.

It was determined that 13.6 per cent of the feed was rejected by gravity means without incurring a significant loss of metal. This could reduce overall milling costs and the sludge tailings dam necessary if a gravity circuit were included in the milling process. In addition, general milling costs per tonne of ore treated could be lower because of the elimination of one of the hardest components of the ore. The weight recovery in the flotation plant would increase because of the increase in metal values being fed to the mills.

The ground bulk sample was fed to a magnetic separator and yielded some surprising results. This process demonstrated that 18.7 per cent of the bulk sample was removed by magnetic separation, giving a product with greatly enhanced zinc, silver and gold levels, as well as reduced iron levels. A separate milling and flotation circuit could be considered for the treatment of this component.

The results demonstrated that both the gold/copper and silver/lead relationships are not constant throughout the individual products. This could indicate that there is free gold and silver present in the bulk sample.

                            OVERALL RESULTS

                                 Weight                          Ag      Au
                                      %    %Cu   %Pb    %Zn     g/t     g/t
Analysis of products
Feed value from weighted balance    100   0.79  4.77  10.35  126.32    1.62
Spiral product without magnetics   46.0   0.93  5.89   6.82  117.35    1.96
Magnetics                          18.7   0.52  5.27  20.27  192.97    2.68
-75 micro m                        21.7   0.98  4.00  13.70  147.30    0.86
Spiral rejects                     13.6   0.37  1.53   3.30   31.20    0.27
Percent distribution of metals
Spiral product without magnetics   46.0   54.3  56.8   30.3    42.7    55.5
Magnetics                          18.7   12.3  20.7   36.7    28.6    30.8
-75 micro m                        21.7   27.0  18.1   28.7    25.3    11.5
Spiral rejects                     13.6    6.4   4.4    4.3     3.4     2.2