Goldsource Reports Positive Results for Eagle Mountain Metallurgical Test Program and Announces 2023 Work Plans

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Vancouver, British Columbia--(Newsfile Corp. - February 2, 2023) - Goldsource Mines Inc. (TSXV: GXS) (OTCQX: GXSFF) (FSE: G5MA) ("Goldsource" or the "Company") is pleased to announce positive results from the 2022 metallurgical test program, and the 2023 work plans for the Company's 100%-owned Eagle Mountain Gold Project ("Project") in Guyana, South America.

2022 Metallurgical Highlights

  • Results demonstrated high gold recoveries. Using conventional processing techniques, gold recoveries averaged 95% for saprolite and 90% for fresh rock composites.
  • With positive implications for plant design, saprolite gold recoveries were generated with a coarse grind size of 80% passing 165 microns. With an estimated 50% (by mass) of the saprolite samples already finer than 150 microns, after screening the potential exists for a high proportion of the saprolite material to report directly to a leach circuit without upfront grinding. Accordingly, as part of the plant design work the Company will review opportunities for significant capital and operating cost reductions by taking into account the advantageous features of the saprolite as it relates to size distribution and its soft rock characteristics.
  • Fresh rock gold recoveries averaged 92% in the main Eagle Mountain deposit and 84% in the satellite Salbora deposit and Toucan prospect. Results were based on a conventional grind size distribution of 80% passing 80 microns.

Summary of 2023 Work Plans
With respect to the 2023 work programs for exploration and engineering, these activities will advance concurrently. Exploration will test new target areas within the Eagle Mountain Prospecting License ("EMPL"), such as the recently discovered higher-grade North Zion prospect (see news release dated December 13, 2022) and include expansion and infill drilling of the current mineral resource areas to facilitate ongoing engineering studies. Across many of the engineering disciplines, activities proceeded slower than anticipated in 2022. Thus, 2023 works plans call for the delivery of a Preliminary Economic Assessment ("PEA") while the Company advances the technical work for the delivery of a Prefeasibility Study ("PFS"). The PEA will focus on shallow, low strip ratio open pits with priority given to saprolite mineralization to establish initial low capex-intensity gold production. For fresh rock, trade-off studies are currently underway to evaluate options for the development timeline and the production scale with a focus on staging the development capex and maximizing the utility of the in-place infrastructure provided by a saprolite operation.

Steve Parsons, P. Eng., CEO of Goldsource, added, "The confirmation of high gold recoveries across the resource areas particularly for the main Eagle Mountain deposit is a step in the right direction for the Project. In the context of establishing a low capex intensity development plan for a saprolite operation, the metallurgical characteristics of the saprolite mineralization provide a significant benefit as compared to a conventional hard rock plant. The planned PEA, before completing the PFS, is expected to incorporate these features as well as the engineering work completed to date."

2022 Metallurgical Test Program
The metallurgical test program was conducted by SGS Canada Inc. and comprised 26 samples (9 saprolite and 17 fresh rock) for 750 kilograms collected from diamond drill core for the areas represented in the 2022 mineral resource estimate ("2022 MRE") for the Eagle Mountain Gold Project. The Project includes the Eagle Mountain deposit, Salbora deposit, and Toucan prospect. The program was designed to profile the mineral resource areas for metallurgical characteristics, including gold recovery, reagent consumption and grindability, with the information to be used to guide plant design work. This program follows saprolite test work completed by SGS Canada in 2018, which included gold recovery tests for 22 saprolite samples from the Eagle Mountain deposit (see news release dated May 17, 2018).

Gold ("Au") head assays were determined by the screened metallics method for the fresh rock samples and by size fraction analysis for the saprolite samples. For the saprolite samples gold grades ranged from 0.55 grams per tonne ("gpt") to 2.47 gpt gold and 0.35 gpt to 3.64 gpt gold for the fresh rock (Table 1).

Table 1: Gold Head Assays of Saprolite and Fresh Rock Samples

UnitSaproliteFresh Rock
  1. Gold head assays were determined by size fraction analysis for the saprolite samples and by screened metallics method for the fresh rock samples.

All saprolite and fresh rock samples were submitted for grindability testwork, including Bond ball mill work index and abrasion index tests to be used for plant design work (equipment selection and sizing). Four (4) saprolite and five (5) fresh rock composites were prepared for gold recovery and grind size optimization testwork. Standard cyanide bottle roll tests were completed on gravity tailings for the saprolite and fresh rock composites. For the saprolite composites tests were also completed on whole ore (no gravity concentration) to enable a coarse feed size in the bottle roll tests.

Table 2 shows the whole ore gold recoveries and reagent consumption for the four saprolite composites. For all saprolite composites, the testwork returned high gold recoveries, including with a coarse grind size of 80% passing 166 microns. Cyanide consumptions were low and lime consumption moderate to high, as is common with saprolite deposits. The averages in Table 2 and 3 are weighted based on the estimated contribution of gold ounces of each area to the 2022 MRE.

Table 2: Saprolite Composites - Gold Recovery with Whole Ore Leaching

Saprolite Composites(1)Whole Ore Leach(2)Grind Size P80 (µm)(3)Reagent
Au Recovery (%)
(kg/t of CN Feed)CN Leach
NaCNCaO24 hr36 hr48 hrTotal
Eagle Mtn DepositW/O1750.132.5589.891.791.991.9
(Ounce/Zion areas)1240.122.4486.593.998.998.9
Eagle Mtn DepositW/O1820.042.2394.694.996.296.2
(Kilroy/Bucket areas)1190.022.2894.494.695.795.7
Eagle Mtn DepositW/O1520.122.8896.095.998.098.0
(Scrubber/No 1/Baboon areas)1090.442.6294.196.298.498.4
Salbora Deposit W/O1290.124.0395.495.795.395.3
Weighted Avg(4) by contribution to MREW/O1660.112.7293.194.094.994.9


  1. Saprolite composite leaching conditions: pulp density 33% solids by weight; pulp pH: 10.5 - 11 maintained with lime; total retention time 48 hours; kinetic solution samples 24, 36, and 48 hours assayed for gold.
  2. Whole ore leach was used to evaluate gold extraction from coarser grind sizes as compared to gravity separation tailings which were of a finer grind.
  3. P80 (80% passing) represents the particle size distribution of the leach feed material ("CN Feed"). A P80 of 175 µm indicates that 80% of the leach feed material is finer than 175 µm.
  4.  Average is weighted based on the relative contribution of ounces from each area (or deposit) in the 2022 MRE.

Table 3 shows the total gold recoveries and reagent consumption for the five fresh rock composites. Fresh rock gold recoveries were also high averaging 92% for the main Eagle Mountain deposit at a p80 of approximately 80 microns. At a similar grind size, the gold recoveries for the Salbora deposit and Toucan prospect averaged 85%. Higher recoveries were generated with finer grinding. Cyanide and lime consumptions were low to moderate for all fresh rock composites.

Table 3: Fresh Rock Composites - Gold Recovery with Gravity Concentration and Leaching

Fresh Rock Composites(1)Grind Size P80 (µm) (2)Reagent ConsumptionAu Recovery (%)
(kg/t of CN Feed)CN Leach GravityTotal(3)
NaCNCaO24 h36 h48 h
Eagle Mtn Deposit
Eagle Mtn Deposit
Eagle Mtn Deposit
(No 1/Baboon)
Salbora Deposit1890.180.5567.769.772.57.574.6
Toucan Prospect1890.220.3468.568.768.719.074.6
Weighted Avg(4) by Contribution to MRE at ~800.910.3685.587.087.721.690.0


  1. Fresh rock composite leaching conditions: pulp density 40% solids by weight; pulp pH: 10.5 - 11 maintained with lime; total retention time 48 hours; kinetic solution samples 24, 36, and 48 hours assayed for gold.
  2. P80 (80% passing) represents the particle size distribution of the leach feed material ("CN Feed"). A P80 of 83 µm indicates that 80% of the leach feed material is finer than 83 µm.
  3. Total recovery is the proportional sum of gold recovered to a gravity concentrate and to leach solution.
  4. Average is weighted based on the relative contribution of ounces from each area (or deposit) in the 2022 MRE.

2023 Exploration
The exploration plan for 2023 will be two pronged and include generative and drilling activities. The generative program will focus on building the pipeline of early-stage exploration targets within the EMPL and include work in underexplored areas of the prospecting license. This will include follow-up augering, trenching and potentially drilling in the North Zion prospect area, where Trench NZTR22-005 identified two intervals of high-grade mineralization with 40.0 metres grading 5.16 gpt gold and 14.0 metres grading 1.25 gpt gold. Drilling activities with the Company-owned diamond drill rig will be split between exploration drilling in target areas along the north-south Salbora-Powis Trend and infill/expansion drilling proximal to the 2022 MRE outline testing saprolite and higher-grade fresh rock targets to support ongoing engineering work, including pit scheduling studies.

The Qualified Person under National Instrument 43-101 - Standards of Disclosure for Mineral Projects for this news release is N. Eric Fier, CPG, P.Eng., Executive Chairman for Goldsource, who has reviewed and approved its contents.

Goldsource Mines Inc. ( is a Canadian exploration company focussed on the 100%-owned Eagle Mountain gold project in Guyana, South America. The Company is led by an experienced management team, proven in making precious metals exploration discoveries and executing on phased project development in the Americas.

Steve Parsons

Goldsource Mines Inc

For Further Information:

Goldsource Mines Inc.
Contact: Steve Parsons, CEO
Telephone: +1 (604) 694-1760
Fax: +1 (604) 357-1313
Toll Free: 1-866-691-1760 (Canada & USA)
Email: [email protected]
570 Granville Street, Suite 501
Vancouver, British Columbia V6C 3P1


This news release contains "forward-looking statements" within the meaning of Canadian securities legislation. Such forward-looking statements concern Goldsource's strategic plans; timing and expectations for the Company's exploration and drilling programs at Eagle Mountain; plans for a PEA and a PFS; and information regarding high grade areas projected from sampling results and drilling results. Such forward-looking statements or information are based on a number of assumptions, which may prove to be incorrect. Assumptions have been made regarding, among other things: conditions in general economic and financial markets; accuracy of assay results; reliability of the 2022 MRE; availability of mining equipment; availability of skilled labour; timing and amount of capital expenditures; performance of available laboratory and other related services; the impact of the COVID-19 pandemic on operations; availability of funds; and future operating costs. The actual results could differ materially from those anticipated in these forward-looking statements as a result of the risk factors including: the timing and content of work programs; the ultimate impact of the COVID-19 pandemic on operations and results, results of exploration activities and development of mineral properties; the interpretation of drilling results and other geological data; the uncertainties of resource estimations; receipt, maintenance and security of permits and mineral property titles; environmental and other regulatory risks; project costs overruns or unanticipated costs and expenses; delays in release of an updated mineral resource; availability of funds; and general market and industry conditions. Forward-looking statements are based on the expectations and opinions of the Company's management on the date the statements are made. The assumptions used in the preparation of such statements, although considered reasonable at the time of preparation, may prove to be imprecise and, as such, readers are cautioned not to place undue reliance on these forward-looking statements, which speak only as of the date the statements were made. The Company undertakes no obligation to update or revise any forward-looking statements included in this news release if these beliefs, estimates and opinions or other circumstances should change, except as otherwise required by applicable law.

Neither TSX-V nor its Regulation Services Provider (as that term is defined in policies of the TSX-V) accepts responsibility for the adequacy or accuracy of this release.

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