Sitka Reports 94.3% Gold Recovery and 84.7% Tungsten Recovery from Metallurgical Testing at the Rhosgobel Deposit at Its Rc Gold Project, Yukon
Rhea-AI Summary
Sitka Gold (OTCQX:SITKF) reported initial metallurgical testwork from the Rhosgobel deposit showing gold recovery averaging 94.3% (range 91.8%–97.3%) using whole-ore bottle roll CIL/CIP-style tests at 75 μm and tungsten recovery of 84.7% in rougher flotation with mass pull <1%.
Over 85% of gold leached within six hours. Sitka cites an inferred resource of 2.25 Moz Au (100.68 Mt @ 0.70 g/t Au) and plans 30,000 m of drilling at Rhosgobel in 2026.
Positive
- Average gold recovery of 94.3%
- Tungsten recovery of 84.7% with mass pull 1%
- 85%+ of gold recovered within six hours
- 30,000 m of drilling planned at Rhosgobel in 2026
- Inferred resource: 2.25 Moz Au (100.68 Mt @ 0.70 g/t Au)
Negative
- Resource reported only in the Inferred category (uncertainty remains)
- Initial metallurgical tests used limited composite samples (6 gold composites, 1 tungsten master composite)
News Market Reaction – SITKF
In the May 4 session, SITKF gained 3.97%, reflecting a moderate positive market reaction.
Data tracked by StockTitan Argus on the day of publication.
AI-generated analysis. How Rhea-AI works. Not financial advice.
Gold recovery averaging
94.3% from Rhosgobel deposit utilizing conventional whole ore cyanidation leaching at a grind size of 75 microns;Results from initial metallurgical testing returned a tungsten recovery of
84.7% in rougher concentrate using conventional flotation with a very low mass pull of less than1% ;Initial metallurgy confirms high recoveries for both tungsten and gold and demonstrates that tungsten could be a valuable by-product of potential future production at Rhosgobel
Multiple occurrences of visible gold and tungsten mineralization have been observed in the initial 2026 drill core at Rhosgobel
60,000 m diamond drill program underway; 30,000 m of drilling planned at Rhosgobel in 2026
Four diamond drill rigs are currently active on the property; two additional rigs anticipated to mobilize in the coming weeks
Vancouver, British Columbia--(Newsfile Corp. - May 4, 2026) - Sitka Gold Corp. (TSXV: SIG) (FSE: 1RF) (OTCQX: SITKF) ("Sitka" or "Sitka Gold" or the "Company") is pleased to announce positive results from initial metallurgical testwork completed for gold and tungsten recoveries at the newly discovered Rhosgobel Gold Deposit (inferred mineral resource estimate of 2.25 million ounces of gold with 100.68 Mt @ 0.70 g/t Au; see news release dated February 25, 2026) at its flagship RC Gold Project in Yukon.
The results of the initial testwork demonstrate robust gold recoveries ranging from
A high tungsten recovery that averaged
"Initial metallurgical testing of gold and tungsten recoveries at Rhosgobel has returned some excellent results with an average recovery of
"Furthermore, multiple occurrences of visible gold and tungsten mineralization have been observed in the initial 2026 drill core at Rhosgobel as we continue to expand drilling beyond the known mineralized envelope. With 30,000 metres of drilling planned at Rhosgobel this year, which will triple the total amount of drilling completed there to date, we look forward to rapidly expanding this unique gold and tungsten deposit that begins at surface and remains wide open in all directions."
Rhosgobel Initial Metallurgical Results
Gold Recovery
Sitka selected mineralized intervals of representative drill core from 2025 drilling at the Rhosgobel deposit to complete initial gold and tungsten recovery testwork. The individual samples were shipped to Blue Coast Research Ltd. in Parksville, British Columbia for sample preparation and metallurgical testing. The sample intervals were composited into 6 separate test composites as shown in Table 1 and were used for the preliminary gold recovery metallurgical testing.
Conventional bottle roll cyanidation tests were completed on 6 composite samples at a target grind size of 75 um and a leaching duration of 48 hours. The whole ore leach results ranged from
Table 1. Rhosgobel composite sample head assays for gold recovery testwork.
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Table 2. Bottle Roll Test Parameters.
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Table 3. Summary results for gold recovery testwork at the Rhosgobel deposit.
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Figure 1: Kinetic Gold leach results
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Tungsten Recovery
Preliminary conventional flotation was tested to assess the potential for tungsten recovery in Rhosgobel samples. 3 separate core sample intervals from Rhosgobel drill holes from the 2025 drilling program were combined into a single master composite to complete the initial testwork. The composite samples used to prepare the master composite for tungsten testwork are shown in Table 4.
Table 4. Composite samples for tungsten recovery testwork
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The tungsten flotation testwork was completed at a coarse grind size of 191 um using 2 kg. of master composite sample at
3 stages of rougher flotation were completed in series (W Rougher 1 Con, W Rougher 2 Con and W Rougher 3 Con; see Table 5) which resulted in a total tungsten recovery of
Table 5. Summary results for tungsten recovery testwork at the Rhosgobel deposit.
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Figure 2: Plan map of the Rhosgobel Intrusion showing gold assays and tungsten composites from the 2024 - 2025 diamond drilling. Composites from the labelled drill holes were used for initial metallurgical testing reported in this news release (see Tables 1 and 4 for details). Drilling to date has been focused on the core of the target area which is supported by a large 1.5 km x 2.0 km gold-in-soil anomaly. Up to 30,000 metres of additional drilling is planned at Rhosgobel this year.
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Tungsten Mineralization at Rhosgobel
Tungsten mineralization has been observed in all of the drill holes completed to date across the 3x2 km Rhosgobel Intrusion and occurs as coarse (up to 5 cm) scheelite crystals within the sub-metre scale quartz, and quartz tourmaline veins and as smaller (0.5-1 cm) crystals within the centimetre-scale sheeted quartz veins cutting the quartz monzonite intrusion at Rhosgobel. Analytical results and the initial metallurgical recoveries of up to
An example of a large, intrusion-related tungsten deposit that is amenable to open-pit mining is Northcliff Resources Sisson Deposit located in New Brunswick - a pre-construction stage tungsten-molybdenum deposit that hosts 387 Mt of tungsten grading
- https://www.northcliffresources.com/sissonprojecttechnical
- https://www.northcliffresources.com/post/northcliff-announces-sisson-project-on-canada-s-nation-building-projects-list
- https://www.northcliffresources.com/post/northcliff-announces-funding-to-accelerate-development-of-the-sisson-critical-minerals-project
- https://www.northcliffresources.com/post/northcliff-announces-government-of-canada-funding-for-the-sisson-project
Figure 3: Long Section through the Rhosgobel Deposit showing the grade shell, block model with gold grades > 1 g/t, and the tungsten assays in the 2025 drilling within current proposed pit limits. Up to 30,000 metres of drilling is planned at Rhosgobel this year.
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Figure 4: Example of scheelite (top picture), a common tungsten mineral, illuminated by ultra-violet light with visible gold and bismuthinite (red circles) in a quartz vein in drill core from the Rhosgobel intrusion along with an additional example of visible gold (bottom picture), both observed in DDRCRG-25-042.
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Figure 5: A photo showing the floatation testing with scheelite illuminated by ultra-violet light. Initial floatation testing returned an
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Figure 6: Long Section of the Clear Creek Intrusive Complex (CCIC).
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About the RC Gold Project
Sitka's
The RC Project hosts an indicated MRE of 1,291,000 ounces of gold and an inferred MRE of 3,829,000 ounces of gold (see Table 3 below) hosted within three at surface, road accessible pit constrained deposits. The 2026, 60,000m drill program is focused on expanding all three known deposits in addition to testing other high potential targets in close proximity to the current resources.
Table 6: Summary of RC Gold Project Mineral Resources
| Zone | Class | Cut-off Grade (g/t Au) | Tonnes (000's) | Gold Grade (Au g/t) | Oz Au (000's) |
| Blackjack * | Indicated | 0.3 | 39,962 | 1.01 | 1,291 |
| Blackjack * | Inferred | 0.3 | 34,603 | 0.94 | 1,044 |
| Rhosgobel** | Inferred | 0.3 | 100,677 | 0.7 | 2,250 |
| Eiger** | Inferred | 0.3 | 32,143 | 0.52 | 535 |
| Total Inferred | Inferred | 0.3 | 167,423 | 0.72 | 3,829 |
* Notes for Blackjack Resources:
Mineral resource estimate prepared by Ronald G. Simpson of GeoSim Services Inc. with an effective date of January 21, 2025.
Mineral Resources are estimated consistent with CIM Definition Standards and reported in accordance with NI 43-101.
Mineral resources are not mineral reserves and do not have demonstrated economic viability.
Mineral resources are constrained by an optimized pit shell using the following assumptions: US
$200 0/oz Au price; a 45° pit slope; assumed metallurgical recovery of85% ; mining costs of US$2.00 per tonne; processing costs of US$10.00 per tonne; G&A of US$4.00 /t.The base case cut-off of 0.3 g/t Au is believed to provide a reasonable margin over operating and sustaining costs for open-pit mining and processing.
Totals may not sum due to rounding.
** Notes for Rhosgobel and Eiger Resources:
Mineral resource estimate prepared by Ronald G. Simpson of GeoSim Services Inc. with an effective date of February 25, 2026.
Mineral Resources are estimated consistent with CIM Definition Standards and reported in accordance with NI 43-101.
Mineral resources are not mineral reserves and do not have demonstrated economic viability.
Mineral resources are constrained by an optimized pit shell using the following assumptions: US
$300 0/oz Au price; a 45° pit slope; assumed metallurgical recovery of85% ; mining costs of US$2.50 per tonne; processing costs of US$14.00 per tonne; G&A of US$4.00 /t.The base case cut-off of 0.3 g/t Au is based on a gold price of US
$250 0/oz and believed to provide a reasonable margin over operating and sustaining costs for open-pit mining and processing.Totals may not sum due to rounding.
All of these deposits begin at surface and are potentially open pit minable. Initial bottle roll metallurgical testing confirmed the non-refractory characteristics of the gold mineralization and returned gold extraction rates averaging around
For the purposes of the current resource model, it is assumed that a likely mill flowsheet would consist of a gravimetric, flotation, and cyanidation circuit.
Upcoming Events
Sitka Gold will be attending and/or presenting at the following events*:
- Canaccord Global Metals and Mining Conference: Henderson, NV: May 19 - 21, 2026
- TAKESTOCK Investor Series Stampede Special, Calgary, AB: June 30, 2026
- Yukon Mining Alliance - Property Tours and Conference, Dawson City, Yukon: July 12-15, 2026
- Diggers and Dealers: Kalgoorlie, Western Australia: August 3 - 5, 2026
*All events are subject to change.
About Sitka Gold Corp.
Sitka Gold Corp. is a well-funded mineral exploration company headquartered in Canada. The Company is managed by a team of experienced industry professionals and is focused on exploring for economically viable mineral deposits with its primary emphasis on gold, silver and copper mineral properties of merit. Sitka is currently advancing its
A 60,000 metre diamond drilling program planned for 2026 is currently underway at the Company's flagship RC Gold Project, located in Yukon Canada, where 4 diamond drill rigs are currently operating.
*For more detailed information on the Company's properties please visit our website at www.sitkagoldcorp.com
Quality Assurance/Quality Control
On receipt from the drill site, the HTW/NTW-sized drill core was systematically logged for geological attributes, photographed and sampled at Sitka's core logging facility. Sample lengths as small as 0.3 m were used to isolate features of interest, otherwise a default 2 m downhole sample length was used. Each sample is identified by a unique sample tag number which is placed in the bag containing the core to be assayed. Core was cut in half lengthwise along a predetermined line, with one-half (same half, consistently) collected for analysis and one-half stored as a record. Standard reference materials, blanks and duplicate samples were inserted by Sitka personnel at regular intervals into the sample stream. Bagged samples were placed in secure bins to ensure integrity during transport. They were delivered by Sitka personnel or a contract expeditor to ALS Laboratories' preparatory facility in Whitehorse, Yukon, with analyses completed in North Vancouver.
ALS is accredited to ISO 17025:2005 UKAS ref. 4028 for its laboratory analysis. Samples were crushed by ALS to over 70 per cent passing below two millimetres and split using a riffle splitter. One-thousand-gram splits were pulverized to over 85 per cent passing below 75 microns. Gold determinations are by fire assay with an inductively coupled plasma mass spectroscopy (ICP-AES) finish on 50 g subsamples of the prepared pulp (ALS code: Au-ICP-22). Any sample returning over 10 g/t gold was re-analyzed by fire assay with a gravimetric finish on a 50 g subsample (ALS code: Au-GRA21). In addition, a 51-element analysis was performed on a 0.5 g subsample of the prepared pulps by an aqua regia digestion followed by an inductively coupled plasma mass spectroscopy (ICP-MS) finish (ALS code: ME-MS41). Samples intervals were then selected for additional XRF analysis on a lithium borate fusion (ALS code: XRF-15b) for WO3.
The scientific and technical content of this news release has been reviewed and approved by Gilles Dessureau, P.Geo., V.P. Exploration of the Company, and a Qualified Person (QP) as defined by National Instrument 43-101.
ON BEHALF OF THE BOARD
"Corwin (Cor) Coe"
CEO and Director
For more information, please contact:
Sitka Gold Corp.
+1-604-979-0509
info@sitkagoldcorp.com
Neither TSX Venture Exchange nor its Regulation Services Provider (as that term is defined in policies of the TSX Venture Exchange) accepts responsibility for the adequacy or accuracy of this release.
Cautionary and Forward-Looking Statements
This release includes certain statements and information that may constitute forward-looking information within the meaning of applicable Canadian securities laws. Forward-looking statements relate to future events or future performance and reflect the expectations or beliefs of management of the Company regarding future events. Generally, forward-looking statements and information can be identified by the use of forward-looking terminology such as "intends" or "anticipates", or variations of such words and phrases or statements that certain actions, events or results "may", "could", "should", "would" or "occur". This information and these statements, referred to herein as "forward‐looking statements", are not historical facts, are made as of the date of this news release and include without limitation, statements regarding future plans, the advancement of the Company's projects and anticipated work programs, ongoing drilling activities and management's expectations and intentions.
Such forward-looking information and statements are based on numerous assumptions, including among others, that the Company will carry out its exploration plans as currently anticipated by management. Although the assumptions made by the Company in providing forward-looking information or making forward-looking statements are considered reasonable by management at the time, there can be no assurance that such assumptions will prove to be accurate.
These forward‐looking statements involve numerous risks and uncertainties and actual results might differ materially from results suggested in any forward-looking statements. These risks and uncertainties include, among other things, market uncertainty, risks related to exploration activities and the results of the Company's anticipated work programs.
Although management of the Company has attempted to identify important factors that could cause actual results to differ materially from those contained in forward-looking statements or forward-looking information, there may be other factors that cause results not to be as anticipated, estimated or intended. There can be no assurance that such statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking statements and forward-looking information. Readers are cautioned that reliance on such information may not be appropriate for other purposes. The Company does not undertake to update any forward-looking statement, forward-looking information or financial outlook that are incorporated by reference herein, except in accordance with applicable securities laws. We seek safe harbor.
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