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Rokmaster Resources Corp (2)
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Rokmaster Resources samples 12.559 per cent Cu at Big Copper

2021-11-24 09:43 ET - News Release

Mr. John Mirko reports


Rokmaster Resources Corp. has released results of the preliminary prospecting program at the road-accessible Big Copper property, located in southeastern British Columbia. Rokmaster's prospecting program was a response to the resurgence in copper-silver prices and significant increase in exploration exclusively directed toward discovery of large sedimentary hosted copper-silver deposits (the second most important global source of Cu, lagging only to porphyry Cu deposits in total resource) in southeastern British Columbia, northern Montana and Idaho.

John Mirko, president and chief executive officer of Rokmaster, stated: "For many years, Big Copper had been a secondary asset within Rokmaster's project portfolio. Our re-examination of the Big Copper property has been predicated by:

  1. "Rapid and substantial increases in copper and silver prices and projected supply short falls for these metals, and;
  2. "Greatly enhanced competitor activity in the search for sediment hosted copper deposits in southeastern British Columbia.

"Big Copper has always been a significant sediment hosted copper-silver occurrence and the results of our prospecting surveys further support this conclusion. Exploration at Big Copper will be low cost and may offer high returns. Rokmaster looks forward to developing and implementing an exploration strategy to cost effectively advance Big Copper over the coming months."

Big Copper property: The Big Copper property tracks a mineralized deformation and alteration front for approximately 4.5 kilometres defined by at least three adits, outcrops, seven trenches and several drill holes which support strong copper-silver mineralization. Mineralized zones are hosted within the 1,300-to-2,300-metre-thick Creston formation which is composed of fine-grained silt stones, argillites and dirty quartzites. Mineralization is best developed within a strong, 50-to-60-metre-wide deformation zone, forming along the western limb of a regional-scale antiform. Mineralization is proximal from the transition from bright green, chlorite rich sediments to thin bedded yellow-cream quartz rich sediments. This colour change may represent the change from reduced to oxidized fluids, a common signature of mineralization at sediment hosted copper deposits. At Big Copper, quartzite rock units may become increasingly calcareous representing a transitional contact with the overlying Kitchener formation. The Creston formation is correlative with the Revett formation which hosts several large copper-silver deposits and undeveloped occurrences in northern Montana and Idaho, including the Spar Lake, Montanore and Rock Creek deposits. Like the large sediment-hosted copper deposits in the Revett formation, the Big Copper property is unusual in that it hosts both copper and silver at significant levels.

Mineralization at the Big Copper property has two dominant styles, including:

  1. Disseminated chalcopyrite-pyrite grains forming parallel to the dominant foliation and locally forming discrete sulphide bands;
  2. Clotted chalcopyrite grains hosted within bedding parallel, deformed quartz-siderite veins.

Copper-silver grades and widths in historical trenches and drill holes included:

  • Trench 1: 5.5 metres of 0.83 per cent Cu and 23.3 grams per tonne silver;
  • Trench 3: 1.1 m of 1.20 per cent Cu and 16.5 g/t Ag;
  • Trench 7: two m of 2.95 per cent Cu and 35.7 g/t Ag.

In 1965, Cominco collared five diamond drill holes at an elevation of approximately 1,830 metres on the north side of the Saint Mary's River. Four out of the five drill holes cored significant copper mineralization; significantly silver was not assayed for.

  • DDH 1A: 4.4 m of 3.30 per cent Cu (within 29.7 m of 1.40 per cent Cu);
  • DDH 3: 4.1 m of 1.20 per cent Cu;
  • DDH 4: three m of 0.20 per cent Cu;
  • DDH 5: 1.5 m of 1.60 Cu.

In 1967, four percussion drill holes targeted the Big Copper mineralized zone at an elevation of 1,370 m, also on the north side of the Saint Mary's River, cut:

  • Drill hole S1: 12.2 m of 0.92 per cent Cu and 6.2 g/t Ag;
  • Drill hole S2: 9.1 m of 0.57 per cent Cu and 3.4 g/t Ag;
  • Drill hole S3: 9.1 m of 0.19 per cent Cu and trace Ag;
  • Drill hole S4: 9.1 m of 0.85 per cent Cu and 12.0 g/t Ag.

Rokmaster's prospecting team examined historical trenches, rock outcrops and waste dumps along the strike of the mineralized zone at Big Copper. All samples were collected north of the Saint Mary's River over a strike length of approximately 1,000 m. The zone is also known to continue to the south of the Saint Mary's River, e.g. the 4600 Creek showing, adding at least 2,500 m to the strike length of the known mineralized zone.

Over this broad area, seven rock and chip samples averaged 0.16 g/t gold, 77 g/t Ag and 3.43 per cent Cu. Lead and zinc values within these samples are negligible. The copper-silver ratios are strong and within the range of historical averages. Significantly, the gold content ranges from 0.02 to 0.35 g/t Au and averages 0.17 g/t Au.

The prospecting samples characterize the higher-grade mineralization. These results are within the range of those reported by previous operators, confirming that Big Copper is a robust copper-silver sediment hosted occurrence, and one which may have a significant structural overprint.

Quality assurance/quality control

All prospecting rock samples were shipped to MSA Labs in Langley, B.C. MSA Labs is an ISO (International Organization for Standardization) 17025 (Testing and Calibration Laboratory) and an ISO 9001 (Quality Management System) certified laboratory. Rock samples were crushed to two millimetres and a 500-gram 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 50-gram 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. In addition to internal MSA lab standards, Rokmaster submitted known standards into the sample stream.

The technical information in this news release has been prepared in accordance with Canadian regulatory requirements and reviewed and approved by Eric Titley, PGeo, a qualified person as per National Instrument 43-101, who is independent of Rokmaster.

About Rokmaster Resources Corp.

Rokmaster controls a portfolio of three significant exploration and development projects, all of which are located in southern British Columbia in regions of excellent infrastructure. The three projects include:

  1. Revel Ridge. Rokmaster is currently conducting an underground drill program at the Revel Ridge project located in southeastern British Columbia 35 kilometres north of the city of Revelstoke. Revel Ridge hosts a high-grade gold and polymetallic orogenic sulphide deposit which has been the subject of a PEA (preliminary economic assessment) technical report dated Dec. 8, 2020.
  2. Big Copper. Rokmaster controls the Big Copper property in the Kimberley area of southern British Columbia. Big Copper is a high-grade copper-silver occurrence hosted in mid-Proterozoic rocks. Copper-silver mineralization has been traced for 4.5 kilometres along strike and is exposed in a series of outcrops, adits and trenches over approximately 500 metres of vertical relief. Big Copper likely belongs to a class of stratabound replacement copper-silver deposits hosted within mid-Proterozoic quartzitic sediments. The style and stratigraphic setting of mineralization at Big Copper may be analogous to similar stratabound silver-copper deposits in northwest Montana, e.g. the Troy mine (a significant past producer of copper and silver) or Hecla's Montanore predevelopment project, with a reported inferred resource of 112 million tonnes at 54.8 grams per tonne silver and 0.7 per cent copper.
  3. Duncan Lake Zinc. Duncan is a carbonate hosted silver-lead-zinc deposit located near Duncan Lake in southern British Columbia. The deposit is hosted within a Cambrian-age Badshot limestone which also hosts silver-lead-zinc mineralization at Teck Resources Ltd. recently producing Pend D'Oreille mine as well as past producers, including the Blue Bell mine, Reeves MacDonald mine, Jersey-Emerald and HB mines. Mineralization at Duncan Lake forms in the crest and limbs of the regional-scale Duncan Lake anticline, where strong lead-zinc plus/minus silver mineralization has been traced by surface and underground drilling for approximately 2,500 metres. At Duncan Lake, Rokmaster will be targeting greater than 30 million tonnes of greeater than 10 per cent Pb plus Zn plus Ag. Historical background and a geological synthesis of the Duncan Lake deposit are provided in a National Instrument 43-101 report by Lane, B., 2018: technical report on the Duncan Lake project.

We seek Safe Harbor.

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