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Rokmaster samples visible gold grains at Revel Ridge

2021-06-07 08:01 ET - News Release

Mr. John Mirko reports


Rokmaster Resources Corp. has provided definitive and highly positive assay results from metallic screened samples containing discrete, macro-scale gold grains with no significant sulphide association. The assay results (see attached table) of the metallic screened samples conclusively demonstrate:

  • The identification of visible, particulate gold grains in drill holes where significant gold assays are reported and further associated with substantially reduced arsenic concentrations. Drill hole intersections with these characteristics currently include underground diamond drill holes RR21-28, RR21-36 and RR21-40.
  • Metallic screening indicates that free gold in these samples may occur in grains which are greater than 106 microns in size, which for the purposes of metallurgy would be classified as coarse particulate grains.
  • Three drill holes containing macro-scale gold grains are separated along strike by 330 metres, all at relatively deep depths within the laterally and vertically persistent Revel Ridge Main zone (RRMZ).
  • Particulate gold was intersected approximately 380 to 490 m vertically below the 830 m drift. The spatial relationships between these drill holes are illustrated in a figure available on-line.
  • Of the six samples submitted for metallic screen assay analysis, three samples had significantly higher gold contents than the initial analysis, one sample was approximately equivalent and two samples had reduced gold assay values. Increased analytical variability may be one of the hallmark characteristics of particulate gold assays, as per the attached table.
  • In all three drill holes, particulate gold is associated with quartz and or quartz+/-carbonate foliation parallel veins sometimes containing other base metal phases and occasionally arsenopyrite. Qualitative, textural and mineralogical characteristics suggest that veins containing coarse gold grains may postdate the formation of auriferous-arsenical high sulphide orogenic veins. Gold in this resident site is not locked into a sulphide phase and has a high probability of being recovered by standard, lower cost metallurgical processes, including gravity.

                                                                Au g/t           Au g/t           Au g/t
                                                               (1.0 kg            (+106            (-106
            From        To    Length     Au g/t (30 g         metallic          micro m           microm
DDH           (m)       (m)       (m)          FA AAS) (1)      screen) (2)    fraction) (3)    fraction) (4)

RR21-28   450.00    451.30      1.30            15.01            16.80           207.30            11.63
RR21-36   535.85    536.75      0.90            22.22            18.40           181.80            14.46
RR21-36   536.75    538.04      1.29            12.98            13.60           303.00             5.79
RR21-40   517.50    518.50      1.00             7.14             1.10            44.50             0.47
RR21-40   518.50    519.50      1.00             0.10            <0.90            <0.90             0.11
RR21-40   519.50    520.50      1.00            27.19            51.00           985.70            21.80

(1) Au g/t (30 grams FA -- AAS) is the original fire assay of the original drill hole sample collected prior 
    to metallic screening.

(2) Au g/t (1.0 kg metallic screen) is a 1.0-kilogram sample which contains the calculated weighted average 
    gold content of both the oversize and undersize samples or the total metallically screened gold in the 

(3) Au g/t (over 106-micrometre fraction) is the result of a fire assay gravimetric finish (FAS-415) of all 
    grains greater than or equal to 106 microns.

(4) Au g/t (less than 106-micrometre fraction) is all gold grains in the sample which is less than or equal 
    to 106 microns and is analyzed by instrument finish (FAS-211).

Reported widths of mineralization are drill hole intervals or core length recovered. Insufficient data exist to permit the calculation of true widths of the reported mineralized intervals.

John Mirko, president and chief executive officer of Rokmaster, commented: "For decades, the Revel Ridge Main zone mineralization has been perceived as an exceptionally significant gold deposit, albeit one with problematic metallurgical characteristics. Two events have unfolded in the past year which challenge this perception. The metallurgical studies undertaken by Rokmaster have definitively demonstrated that approximately 15 per cent of gold mineralization within the deposit is present as free milling ore and could be recovered by using advanced grinding and liberation methods. The remainder of gold is intimately associated with sulphide phases and is recovered by processing methods including pressure oxidation (POX). Very significantly, the 2020 metallurgical results were all obtained from bulk samples collected from the 830 m drift. Most recently, particulate gold identified in DDHs RR21-28, RR21-36 and RR21-40 convincingly demonstrate that Main zone mineralization, at deeper depths in the RRMZ system, has the ability to produce relatively coarse macro-scale gold. At deeper portions of the RRMZ, the gold budget may be shifting from gold associated with sulphide phases to free milling particulate gold. Rokmaster's technical team is further reviewing 2020 and 2021 drill holes for similar particulate gold geochemical signatures. These data begin to challenge historical perceptions regarding gold metallurgical characteristics at Revel Ridge. The presence of coarse particulate gold within the RRMZ could significantly enhance the mineral economics of this already superb deposit."

Quality assurance/quality control

Dr. Jim Oliver, PGeo, supervised all aspects of the drilling and sampling undertaken in the 2020 underground diamond drill program. All samples have been collected from one-half NQ core, sawn with a diamond saw with the sample intervals marked by technical personnel. A full QA/QC program using blanks, standards and duplicates was utilized to monitor analytical accuracy and precision. The samples were sealed on site and shipped to MSA Labs in Langley, B.C. MSA is an ISO 17025 (testing and calibration laboratory) and an ISO 9001 (quality management system) certified laboratory. Standard core processing includes crushing the sample to two millimetres and a 250 g subsample was pulverized with 85 per cent of the sample passing 75 microns. The subsample was analyzed using a combination of MSA Labs FAS211 for Au and ICP-240 (four-acid digestion) for silver, base metals and other trace elements. FAS211 for gold is an ore grade fire assay of a 30 g pulp with an AAS finish with a detection range between 0.01 and 100 parts per million). ICP-240 utilizes four-acid digestion and provides ore grade analytical data on silver, base metals and 26 other elements.

Metallically screened samples are processed by crushing 1.0 kg of rock to 106 micrometres. The entire plus size fraction is analyzed while the minus fraction is analyzed in duplicate. Both fractions use fire assay techniques with a gravimetric or instrumental finish. The two fractions are then combined using a weighted average of the volume of rock contained within the plus and minus samples and their relative gold contents which produce the calculated total gold content of the combined oversized and undersized metallically screened samples.

The technical information in this news release has been prepared in accordance with Canadian regulatory requirements as set out in National Instrument 43-101 and reviewed and approved by Mark Rebagliati, PEng, FEC, who is independent of Rokmaster.

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