Vancouver, British Columbia--(Newsfile Corp. - May 28, 2026) - GoldQuest Mining Corp. (TSXV: GQC) (OTCQX: GDQMF) ("GoldQuest" or the "Company") is pleased to report assay results from five metallurgical drill holes completed at the Company's 100%-owned Romero Gold-Copper Project in San Juan Province, Dominican Republic.

The metallurgical holes, LTP-171 through LTP-175, were drilled to provide fresh representative core for the ongoing geo-metallurgical program and bankable feasibility study work. The assay results confirm multiple high-grade gold-copper intervals within the Romero deposit, while metallurgical test work completed to date continues to support conventional processing assumptions and ongoing process design work.

Highlights:

• High-grade assays from metallurgical drilling: The five-hole program returned several high-grade gold-copper intervals from the central Romero deposit, including 38.6 m grading 45.01 g/t Au, 14.31 g/t Ag and 2.44% Cu in LTP-173, including 26.85 m grading 63.82 g/t Au, 18.93 g/t Ag and 3.23% Cu.
• Additional strong intercepts: Hole LTP-172 returned 27.55 m grading 17.61 g/t Au, 6.07 g/t Ag and 1.40% Cu, including 10.1 m grading 38.71 g/t Au, 10.80 g/t Ag and 2.76% Cu. Hole LTP-174 returned 30.5 m grading 16.47 g/t Au, 2.79 g/t Ag and 1.59% Cu, including 11.6 m grading 34.46 g/t Au, 4.20 g/t Ag and 2.76% Cu.
• Positive local reconciliation: An initial internal reconciliation exercise comparing the new drill results with the resource block model within 10 m diameter cylinders around the metallurgical holes indicates a positive comparison. Further details are provided in the reconciliation section and Table 2 below.
• Integration into ongoing technical work: The new drilling is being evaluated for integration into the ongoing mineral resource estimate update and bankable feasibility study workstreams.
• Metallurgical performance supports Romero development path: Geo-metallurgical domains tested to date are considered amenable to conventional comminution and flotation processing methods, with flotation test work consistent with recovery assumptions applied in the NI 43-101 Pre-Feasibility Study Technical Report for the Romero Gold Project, Dominican Republic, dated November 10, 2016 (the "2016 PFS").
• Process optimization opportunities identified: Test work indicates potential for coarser grinding requirements for flotation without loss of recovery, and preliminary results suggest target recoveries may be achievable without the inclusion of a gravity circuit, subject to completion of the test program.

Luis Santana, CEO of GoldQuest, commented: "These metallurgical drill holes were completed to support ongoing technical studies and provide representative material for geo-metallurgical analysis. In addition to providing fresh information regarding mineralization within the Romero deposit, the results contribute to a broader technical understanding that will be incorporated into ongoing engineering and evaluation work. The localized favorable comparison with the existing block model also provides additional technical information that will be reviewed as part of ongoing studies."

Drill Results Summary:

Figure 1 shows the location of the drillholes and Table 1 summarizes selected significant assay intervals from the five metallurgical drill holes. Interval grades are calculated using uncapped assays. Intervals may not represent true widths. There is insufficient drilling to determine the exact orientation and thickness of the mineralized zones at this time.

Figure 1: Metallurgical holes location

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Table 1: Selected assay results from Romero metallurgical drill holes

Local Reconciliation with the Resource Block Model:

GoldQuest completed an initial internal reconciliation exercise using the new drill hole assays, updated collar and survey information, and a simplified comparison against the resource block model within 10 m diameter cylinders around the metallurgical drill holes. The results are preliminary, internal and are not a mineral resource estimate. A fully updated resource model is expected to consider lithology, alteration, structural controls, estimation parameters and classification criteria.

On this preliminary local basis, the new metallurgical holes compare positively with the existing model. The 10 m cylinder exercise indicates a 43% increase in gold grade, with positive changes in copper and silver grades of 9% and 7%, respectively, considering the five metallurgical holes at a 1.0 g/t Au cut-off. The same local comparison indicates increases of 48% in contained gold ounces, 13% in contained copper and 11% in contained silver within the evaluated 10 m cylinders.

Table 2: Preliminary internal model comparison

Note: Table 2 is based on an internal preliminary comparison within 10 m diameter cylinders around the metallurgical drill holes and is not a mineral resource estimate. The results are intended to illustrate local reconciliation only and do not represent a global update of the Romero block model.

Geo-metallurgical Program Results:

The geo-metallurgical program is a key component of the ongoing bankable feasibility study and has focused on representative samples from defined domains within the Romero deposit. The work completed to date indicates that the tested geo-metallurgical domains are all amenable to conventional comminution and flotation processing methods, supporting the process route contemplated for Romero.

Comminution testing has identified variation in SAG work indices, particularly for softer ores, providing additional information to better align operating cost assumptions with geology. Flotation test work has identified opportunities to evaluate coarser grinding requirements without loss of recovery, while remaining consistent with recovery assumptions applied in the 2016 PFS.

Preliminary test work also suggests that target recoveries may be achievable without the inclusion of a gravity circuit, which could simplify the final flowsheet if confirmed by the remaining work. Mineralogical investigations have been completed to support metallurgical interpretation and address previously identified data gaps, and tailings samples have been generated for ongoing rheological and paste backfill test work.

The results reported remain preliminary and subject to completion of the test program, engineering analysis and integration into the bankable feasibility study. Final metallurgical conclusions and design criteria will be reported as the program advances.

Program Status and Next Steps:

The metallurgical drill holes were completed as part of the Company's broader geo-metallurgical program for Romero. The program is designed to provide fresh material for comminution, flotation, variability and life-of-mine composite test work, as well as additional geological information to support the feasibility study.

GoldQuest is evaluating the integration of the new metallurgical drilling into the ongoing mineral resource estimate update and related feasibility study workstreams. The Company will provide further updates as metallurgical test work, resource modelling and engineering studies advance.

QA-QC

Core from these holes was partially assayed as part of the metallurgical test program at ALS Metallurgy at Kamloops, Canada, and the remainder of the core was assayed at Bureau Veritas. As part of the Company's Quality Assurance and Quality Control procedures ("QA/QC"), the Company reviews results from Certified Standard Reference Materials ("CRSM" or "Standards"), which are inserted at a rate of five per 100 samples. Within the results disclosed herein there were no samples with results outside of the recommended tolerances for the Standards. In GoldQuest's drill programs, composite intervals were chosen using a combination of geological criteria and mineralization, averaging around two metres core length. The drill core is cut in half with one half of the core sample shipped to Bureau Veritas Labs by GoldQuest technicians. The remaining half of the core is kept at the Company core shack for future assay verification, or any other further investigation. Assays within intervals below the 0.005 g/t detection limit for Au were given a 0.0025 g/t value. All drill samples were prepared and screened by ACME Labs (Vancouver); metallic fire assay and multi-element ICP-MS were assayed by Bureau Veritas Laboratories (Vancouver). Gold values are determined by standard fire assay with an AA finish, or, if over 10.0 g/t Au, were re-assayed and completed with a gravimetric finish. Copper and zinc values exceeding 0.2% were re-assayed with a 4-acid digestion and AAS finish. When zinc values exceeded 10% a classic titration was carried out for zinc. QA/QC included the insertion and continual monitoring of numerous standards, blanks and duplicates into the sample stream, at random intervals within each batch.

Qualified Persons

The scientific and technical information contained in this press release has been reviewed and approved by Leandro Sastre, P. Geo., VP of Exploration of GoldQuest, and Franco Martucci, P.E., Senior Metallurgical Engineer. Mr. Sastre is responsible for the exploration and geological information, and Mr. Martucci is responsible for the metallurgical information. Each is a Qualified Person for their respective technical information under NI 43-101 - Standards of Disclosure for Mineral Properties.

About GoldQuest

GoldQuest Mining Corp. is a Canadian exploration and development company with strong participation from Dominican investors, focused on advancing its gold and copper assets in the Dominican Republic. The Company has a Board of Directors and management team with prior experience developing and operating a mine in the country.

Additional information can be viewed at the Company's website www.goldquestcorp.com.

On Behalf of the Board of Directors of GoldQuest Mining Corp.,

"Luis Santana"

Director & CEO

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

Forward-looking statements:

Statements contained in this news release that are not historical facts are forward-looking information that involves known and unknown risks and uncertainties. Forward-looking statements in this news release include, but are not limited to, statements with respect to drill programs, assay results and the interpretation of the results of such drill programs, model reconciliation work, the potential integration of new drilling into an updated mineral resource estimate and feasibility study, mineral resources at Romero and Romero South, the merits of the Company's mineral properties, future drill programs and studies, feasibility study work, metallurgical test work, and the Company's plans and exploration programs for its mineral properties, including the timing of such plans and programs. In certain cases, forward-looking statements can be identified by the use of words such as "plans", "expects" or "does not expect", "is expected", "potential", "likelihood", "appears", "budget", "scheduled", "estimates", "forecasts", "at least", "intends", "anticipates" or "does not anticipate", or "believes", or variations of such words and phrases or state that certain actions, events or results "may", "could", "would", "should", "might" or "will be taken", "occur" or "be achieved".

Forward-looking statements involve known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. Such risks and other factors include, among others, risks related to uncertainties inherent in drill results and the estimation of mineral resources; commodity prices; changes in general economic conditions; market sentiment; currency exchange rates; the Company's ability to continue as a going concern; the Company's ability to raise funds through equity financings; risks inherent in mineral exploration; risks related to operations in foreign countries; future prices of metals; failure of equipment or processes to operate as anticipated; accidents, labor disputes and other risks of the mining industry; delays in obtaining governmental approvals; government regulation of mining operations; environmental risks; title disputes or claims; limitations on insurance coverage and the timing and possible outcome of litigation. There can be no assurance that forward-looking statements will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, do not place undue reliance on forward-looking statements. All statements are made as of the date of this news release and the Company is under no obligation to update or alter any forward-looking statements except as required under applicable securities laws.

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