(TheNewswire)

Vancouver, British Columbia, September 24th, 2025 TheNewswire – Prismo Metals Inc. (the ‘ Company ‘) (CSE: PRIZ,OTC:PMOMF) (OTCQB: PMOMF) is pleased to report that it has received preliminary assay results for the first batch of twenty-three samples taken at its Silver King project located in Arizona. This assay data highlights the different types of mineralization identified in the Company’s news releases of August 28 th and September 15 th 2025 (Figure 1).

‘These assay results confirm the exploration potential at the Silver King project,’ said Dr. Craig Gibson, Chief Exploration Officer. ‘Three samples with silver values reported as greater than 200 g/t were taken from the Silver King mine dump and from the new polymetallic vein recognized in our recent exploration program. Samples with high copper values, that also exhibit important gold values, are largely from the replacement mineralization which is similar to the type of mineralization at the nearby Magma mine.’

Several of the samples have reported values that are greater than the detection limit for the analytical method used. The analytical laboratory must re-analyze these samples by a different method, and the Company is expecting to receive these overlimit assays for silver, copper, lead and zinc within about two weeks. Upon receipt of the over limit assays Prismo will issue a further news release and use this information to help prioritize targets for the further exploration, including the upcoming drilling program. Additional samples, including samples from the Ripsey Mine are currently being analyzed and results are expected in the coming weeks.

‘Much of the focus of the exploration program to date has consisted of a property wide survey of historic mines and prospects surrounding the direct Silver King workings,’ said Gordon Aldcorn, President of Prismo’. ‘ This work has expanded our geological thinking and resulted in the recognition of several new types of mineralization at the project, providing additional targets for exploration. We are presenting the assay results for each of the exploration areas, namely the new mineralized veins (polymetallic and copper), stratigraphically controlled replacement mineralization and the area around the Silver Mine. Each of the areas will be prioritized for further exploration, including drilling.   The initial phase of Prismo exploration on the Silver King project confirmed the exploration potential in several areas. Our upcoming drill program is currently in the permitting stage and is anticipated to be advanced shortly. ‘

Figure 1 . Geologic and land map of the Silver King project showing newly described polymetallic vein in magenta (Ag-Pb-Zn), copper vein in green (Cu-Ag) and stratigraphically controlled replacement mineralization in red.  The strongly altered intrusion with stock work quartz-pyrite veining is indicated by the crosshatch.

New Mineralized Veins (polymetallic and copper veins)

As previously reported in Prismo ‘ s news release of August 28, 2025, the Company geologists identified two previously undescribed veins in the area surrounding the historic glory hole developed on the original exposure of high-grade silver at the Silver King deposit.  The assay results confirm the visual inspection and indicate that there are two distinct veins, one with abundant silver, lead and zinc and the other with copper and silver values.

These veins provide additional exploration targets outside of the area of historic mine workings and may provide information on the controls to mineralization in the pipelike mineralized body.

Table 1. Assay results for selected samples from newly identified veins at the Silver King project.

Stratigraphically Controlled Replacement Mineralization

Several samples were taken along the stratigraphic horizon that hosts replacement and skarn mineralization in numerous small workings. Several samples assayed more than 1% copper and generally contain elevated gold values.

Figure 2. Copper assays for samples taken at the Silver King project.

The m ineralization in this area is similar to that at the Magma mine. It is exposed in several historic mine workings with abundant oxide copper minerals, mainly malachite . These were developed along a northeast dipping limestone horizon near the contact with a quartz diorite intrusion and quartzite . It is located along the same structural and stratigraphic trend of the Magma mine located 0.6 to 1.5 kilometers to the southwest. The largest occurrence, at the Black Diamond mine in the eastern portion of the claim block, was developed on a large outcrop of abundant specular hematite and malachite replacing a limestone bed (Fig. 2) .

Table 2. Assay results for selected samples from the replacement area at the Silver King project.

Figure 3 .  Map showing Silver King project and nearby mineral deposits. The Silver King deposit is located three kilometers from the Resolution Copper deposit (a joint venture between Rio Tinto and BHP) and the high-grade Magma mine, a former copper and silver producer.

Around The Silver King Mine

Two samples were taken of mineralized fragments from the dump around the Silver King workings.  Samples 544514 is composed of selected fragments of quartz vein material with variable amounts of sulfide minerals including stromeyerite (AgCuS), freibergite (CuAgSbS) and base metal sulfides.  Sample 544517 is composed of stockwork veins and breccia with about 50% wall rock fragments.  These two compositions are believed to represent the dominant types of mineralization that will be encountered in and adjacent to the pipelike Silver King mineralized body.

Table 3. Assay results for selected samples from the Silver King mine.

Several additional elements are important in characterizing the different types of mineralization.  The high silver in the Silver King mineralization is associated with gold, copper, lead, zinc and antimony as well as barium and mercury.  The copper replacement mineralization contains important gold along with bismuth.

Figure 4. Silver assays for samples taken at the Silver King project.

Figure 5 . Gold assay values for the Silver King exploration program.

Table 4. Locations for samples mentioned in the text.

Exploration Next Steps

Prismo has submitted a plan of operations for the drill program with the Forest Service. The drill permit is expected by the end of October. A drill program is planned for Silver King, with a minimum of 1,000 meters initially. This first phase of the drill program is designed to test the upper half of the steeply dipping pipelike Silver King mineralized body as well as potentially mineralization adjacent to the dense stockwork that was the focus of historic mining.  Follow up drilling will expand on the initial program based on the results and also include separate targets outside of the historic mining area, such as the polymetallic vein mentioned above. The discovery of the two mineralized veins and porphyry style mineralization has resulted in Prismo evaluating a larger drill program to test those targets.

QA/QC

Samples were analyzed by SGS, an internationally recognized analytical lab, with preparation at the Tempe, Arizona facility and analyses at the Burnaby laboratory.  Prismo inserts controls samples consisting of standard pulps and coarse blanks in the sample stream for QA/QC purposes and also utilizes the labs internal control samples.

Qualified Person

Dr. Craig Gibson, PhD., CPG., a Qualified Person as defined by NI-43-01 regulations and Chief Exploration Officer and a director of the Company, has reviewed and approved the technical disclosures in this news release. The historic data presented in this press release was obtained from public sources, should be considered incomplete and is not qualified under NI 43-101, but is believed to be accurate. The Company has not verified the historical data presented and it cannot be relied upon, and it is being used solely to aid in exploration plans. References to mineralization at the Magma Mine and Resolution Copper deposit is not necessarily indicative to the mineralization on the Silver King property.

About the Silver King

Discovered in 1875, the Silver King mine was one of Arizona ‘ s most important historic producers, yielding nearly 6 million ounces of silver at grades of up to 61 oz/t.  The Silver King mine sits only 3 km from the main shaft of the Resolution Copper project — a joint venture between Rio Tinto and BHP and one of the world ‘ s largest unmined copper deposits with an estimated copper resource of 1.787 billion metric tonnes at an average grade of 1.5% copper (1) . The unique land position is fully surrounded by Resolution Copper ‘ s claim block, offering strategic upside. Selected samples from small-scale production in the late 1990s returned grades as high as 644 oz/t silver (18,250 g/t) and 0.53 oz/t gold (15 g/t), indicating that high-grade mineralization remains.

(1) https://resolutioncopper.com/about-us/

About Prismo Metals Inc.

Prismo (CSE: PRIZ,OTC:PMOMF) is a mining exploration company focused on advancing its Silver King, Ripsey and Hot Breccia projects in Arizona and its Palos Verdes silver project in Mexico.

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Prismo Metals Inc.

1100 – 1111 Melville St., Vancouver, British Columbia V6E 3V6

Phone: (416) 361-0737

Contact:

Alain Lambert, Chief Executive Officer alain.lambert@prismometals.com

Gordon Aldcorn, President gordon.aldcorn@prismometals.com

Cautionary Note Regarding Forward-Looking Information

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 discussions of future plans, estimates and forecasts and statements as to management’s expectations and intentions with respect to, among other things: the timing, costs and results of drilling at Silver King.

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: delays in obtaining or failure to obtain appropriate funding to finance the exploration program at Silver King.

In making the forward-looking statements in this news release, the Company has applied several material assumptions, including without limitation, that: the ability to raise capital to fund the drilling campaign at Silver King and the timing of such drilling campaign.

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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Questcorp Mining Inc. (CSE: QQQ,OTC:QQCMF) (OTCQB: QQCMF) (FSE: D910) (the ‘Company’ or ‘Questcorp’) is pleased to announce that it’s Maiden drilling program at the La Union gold and silver Project in Sonora, Mexico, is progressing on track and on budget, with three of the five main targets now having some initial drilling and work continuing toward completion of the current program. This update follows the Company’s August 6, 2025 announcement marking the start of the program and August 19 and September 10 news releases chronicling the progress of the program.

Saf Dhillon, President and Chief Executive Officer, states: ‘The maiden drill program has been indicating consistency with past mining, and targets are progressing with positive exploration drilling so far. The drilling is intersecting more quartzite than expected which is favorable for fracture-controlled mineralization. The property Operator, Riverside operations team is handling the current exploration program working with the local rancher and the drilling company to efficiently complete the first phase of this exploration program.’

The first hole at the Union Mine target was drilled southeast beneath historic workings, cutting through the Clemente and Caborca formations-both key host units for past mining at Union as described in the filed NI 43-101 report on SEDAR+ by Questcorp Mining (https://www.sedarplus.ca/csa-party/records/document.html?id=48299afdea2a73385e0513ce830753e11ddf957ee61888b81d46e76fa281ac17).

The hole ended in the Caborca Formation, encountering the distinctive microconglomeratic carbonate unit that historically hosted mineralization at the bottom of the Union Mine. Samples from this hole have been delivered to Bureau Veritas in Hermosillo, Sonora, for gold fire assay, with pulps to be sent to Vancouver, Canada, for ICP-MS analysis with 4-acid digestion to determine silver, base metal, and multi-element values. This consistent analytical approach has been applied since the outset of the Union program to ensure comparability across results.

Drilling then moved to the northern part of the project, testing two target areas: the El Cobre Mine area and the North Union Mine area. Here, holes were oriented perpendicular to stratigraphy and toward interpreted feeder zones along pre-mineral fault structures, primarily within the Clemente Formation. Drilling in these areas has intersected more quartzite than initially modeled, with extensive hematitic oxides-an encouraging sign for potential gold mineralization, possibly linked to sulfides that have been oxidized through supergene weathering. Historic mining in the district targeted oxides only, leaving sulfide zones untested. Riverside plans to evaluate this potential beneath past workings across four target areas: Union Mine, El Cobre, North Union, and Famosa.

The program has now moved south to the Famosa target, where two initial holes are planned to test beneath and along strike from historic workings toward a steeply west-dipping, north-south-trending fault structure, as well as into host rocks on either side of this major structural feature. Famosa produced gold historically, with reported grades exceeding ½ oz/ton Au in archived records referenced in the NI 43-101 report. The Company is encouraged by the target’s potential and is eager to advance drilling here.

Once this initial campaign is completed, follow-up work will integrate assay results, ongoing surface programs, additional induced polarization (IP) surveys, and refined geological interpretations based on stratigraphy and structure observed in drilling. The greater-than-expected quartzite content in the Clemente Formation supports the evolving model of fracture- and quartz-pyrite veinlet-hosted gold mineralization, which will help sharpen targeting at the Union Project. Core from all drilling has been logged, saw-cut, and half-core samples sent for assay, with remaining halves retained for reference and cataloging.

The Company looks forward to completing the Famosa drilling, receiving the pending assay results, and providing further updates as this program progresses.

Figure 1. Geologic map with the tenure of the Union internal concession shown in pink. Manto and chimney type CRD targets are shown as red polygons. Riverside now controls all mineral tenures on this map. The drill program will focus on the Union Mine and areas north of the Union Mine with the initial drill work.

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/10197/267723_25b092fc440cbaba_001full.jpg

Figure 2. Cross section looking west with conceptual drill targets and schematic drillhole traces. Assays from Riverside’s sampling of rock dump materials from the two mine areas are labeled in black. Red areas are interpreted as manto and chimney target bodies that are now well defined and drill ready. Assays shown on figures 1 and 2 have been previously released and disclosed as summarized below the geochemical QA/QC and in published NI 43-101 Report that Questcorp published 2025 on SEDAR+.

To view an enhanced version of this graphic, please visit:
https://images.newsfilecorp.com/files/10197/267723_25b092fc440cbaba_002full.jpg

Qualified Person & QA/QC:

The technical content of this news release has been reviewed and approved by R. Tim Henneberry’, P. Geo (BC) a Director of the Company and a Qualified Person under National Instrument 43-101.

Rock samples from previous exploration programs discussed above at the Project were taken to the Bureau Veritas Laboratories in Hermosillo, Mexico for fire assaying for gold. The rejects remained with Bureau Veritas in Mexico while the pulps were transported to Bureau Veritas laboratory in Vancouver, BC, Canada for 45 element ICP/ES-MS analysis using 4-acid digestion methods. A QA/QC program was implemented as part of the sampling procedures for the exploration program. Standards were randomly inserted into the sample stream prior to being sent to the laboratory.

About Questcorp Mining Inc.

Questcorp Mining is engaged in the business of the acquisition and exploration of mineral properties in North America, with the objective of locating and developing economic precious and base metals properties of merit. The company holds an option to acquire an undivided 100-per-cent interest in and to mineral claims totalling 1,168.09 hectares comprising the North Island copper property, on Vancouver Island, B.C., subject to a royalty obligation. The company also holds an option to acquire an undivided 100-per-cent interest in and to mineral claims totalling 2,520.2 hectares comprising the La Union project located in Sonora, Mexico, subject to a royalty obligation.

Certain statements in this news release are forward-looking statements, which reflect the expectations of management regarding completion of survey work at the North Island Copper project. Forward-looking statements consist of statements that are not purely historical, including any statements regarding beliefs, plans, expectations or intentions regarding the future. Such statements are subject to risks and uncertainties that may cause actual results, performance or developments to differ materially from those contained in the statements. No assurance can be given that any of the events anticipated by the forward-looking statements will occur or, if they do occur, what benefits the Company will obtain from them. Except as required by the securities disclosure laws and regulations applicable to the Company, the Company undertakes no obligation to update these forward-looking statements if management’s beliefs, estimates or opinions, or other factors, should change.

To view the source version of this press release, please visit https://www.newsfilecorp.com/release/267723