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Rokmaster Resources Corp (2)
Symbol RKR
Shares Issued 163,240,478
Close 2023-09-05 C$ 0.075
Market Cap C$ 12,243,036
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Rokmaster sorting tests recover 99% Au at Revel Ridge

2023-09-05 13:15 ET - News Release

Mr. John Mirko reports

ROKMASTER REPORTS SENSOR-BASED SORTING GOLD RECOVERY OF 99% AT REVEL RIDGE

Rokmaster Resources Corp. has received very positive results from sorting test work on representative samples from the Revel Ridge project main deformation zone (MDZ).

John Mirko, president and chief executive officer of Rokmaster, stated: "Rokmaster continues to improve recoveries and processing potential of all target metals. Achieving this excellent sorting result of recovering 98 to 99 per cent of all the target metals to 50 per cent of the screened sorter feed, by being able to reject waste rock, sheds light on the ease of identifying the contacts between the mineralization and waste types in this deposit and the potential to decrease the footprint of both the process plant and downstream tails facilities, while moving towards our ESG targets by being good stewards of energy consumption for processing."

The test program was designed and supervised by Stacy Freudigmann, PEng, FAusIMM, of Canenco Consulting Corp. and conducted at the Steinert U.S. Inc. facility in Walton, Ky., United States, with sample preparation and assaying undertaken at Base Metallurgical Laboratories Ltd. (BaseMet), out of Kamloops, B.C.

The sorting objective was to remove the majority of the dilution waste rock types that would be present in mine output, in an effort to significantly upgrade the mineralization feed grade to the process plant. Two representative batches of bulk material from the MDZ (batch 1 and 2 of approximately 529 kilograms and 739 kilograms, respectively) were prepped, compiled and submitted in consultation with the project mining engineers and geologists.

For this sorting program, a cascading test protocol utilizing the X-ray transmission (XRT) sensor was used. These steps would concentrate the densest fraction, and then the subsequent waste fraction from each pass would be tested with a lower threshold. This cascade mode allows for an understanding of the sorting behaviour under various sorting thresholds. Once the sorting algorithm was developed, the two batches of bulk material were fed into the sorter's feed hopper and conveyor using a bobcat and after each separation stage, the product/waste streams were manually and visually examined to identify the extent, if any, of misplaced particles.

The Revel Ridge MDZ mineralization exhibits excellent potential to be sorted using the XRT sorting sensor.

The results indicate that, based on the third separation threshold, over 98 per cent of gold and silver can be concentrated in around approximately 42 per cent of the mass, resulting in an over 120-per-cent upgrade in the corresponding feed grades. At the fourth stage, where 50 per cent of the feed was rejected, over 99 per cent of the gold and silver was recovered to the product with approximately a two-time grade upgrade for all minerals of value.

The testing methodology undertaken provides a reliable tool to identify the best sorting conditions and thresholds, and over all, these tests should satisfy a preliminary economic assessment level of study. It should be noted that the current results were obtained in a controlled laboratory environment and may be optimistic compared with operational sorting scenarios. Operational results will vary with the changing feed conditions from the mine, variability in the deposit itself, actual dilution amounts and numerous other variables. In addition, the nature of cascading test work approach can be biased toward higher recoveries as particles get multiple chances to be sorted; although this does not appear to be a major factor in the MDZ mineralization, it should be taken into consideration.

Further test work was recommended to support continuing engineering studies:

  • The concentrated material from these tests can be used for downstream metallurgical testing to estimate the potential effects on reagent consumption, lead, zinc, gold and silver recoveries, as well as any potential complications with the preconcentration of impurities in the mineralization.
  • It was also recommended that additional confirmatory sorting tests (one tonne to two tonnes) be performed, with introduction of limited variability sample testing.

The technical information in this news release has been prepared in accordance with Canadian regulatory requirements has been reviewed and approved by Mr. Freudigmann, PEng, FAusIMM, who is a qualified person as set out in National Instrument 43-101 and independent of Rokmaster.

About Rokmaster Resources Corp.

Rokmaster's flagship Revel Ridge project is host to a high-grade gold and polymetallic orogenic sulphide deposit which has been the subject of a PEA technical report dated Dec. 8, 2020, and an updated mineral resource estimate on the Revel Ridge property with an effective date of June 6, 2023. The 2023 mineral resource estimate remains open in all directions, and is the basis of the continuing update to the PEA.

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