Grande Portage Announces Outstanding Results from Sensor-Based Ore Sorting Testwork, with Gold Grade of Sample Increased by 120%
Grande Portage Resources (GPTRF) has announced remarkable results from sensor-based ore sorting testwork at its New Amalga Mine Project near Juneau. The testing demonstrated a significant 120% increase in gold grade and a 57% reduction in mass with minimal gold loss.
Key results show that from a 64.8 kg sample with an initial gold grade of 5.9 g/t, the sorting process produced 27.6 kg of sorted product at 12.9 g/t gold while rejecting 37.2 kg of waste material containing only 0.6 g/t gold. The process successfully retained 94% of the gold content while removing 57% of the mass.
The company's conceptual mining plan involves selective underground mining with off-site processing at a third-party facility, leveraging the project's proximity to tidewater and existing infrastructure. The ore sorting technology, tested at Steinert US Inc's facilities, uses sensors to separate waste rock from valuable ore without chemical reagents.
Grande Portage Resources (GPTRF) ha annunciato risultati straordinari dai test di selezione del minerale basati su sensori presso il suo progetto minerario New Amalga vicino a Juneau. I test hanno dimostrato un aumento significativo del 120% nel grado d'oro e una riduzione del 57% della massa con una minima perdita d'oro.
I risultati chiave mostrano che da un campione di 64,8 kg con un grado d'oro iniziale di 5,9 g/t, il processo di selezione ha prodotto 27,6 kg di prodotto selezionato con 12,9 g/t di oro, mentre sono stati scartati 37,2 kg di materiale di scarto contenente solo 0,6 g/t di oro. Il processo ha mantenuto con successo il 94% del contenuto d'oro, rimuovendo il 57% della massa.
Il piano minerario concettuale dell'azienda prevede un'estrazione mineraria sotterranea selettiva con lavorazione off-site presso una struttura di terzi, sfruttando la vicinanza del progetto all'acqua di marea e all'infrastruttura esistente. La tecnologia di selezione del minerale, testata presso le strutture di Steinert US Inc, utilizza sensori per separare le rocce di scarto dal minerale prezioso senza reagenti chimici.
Grande Portage Resources (GPTRF) ha anunciado resultados notables de las pruebas de clasificación de mineral basadas en sensores en su Proyecto Minero New Amalga cerca de Juneau. Las pruebas demostraron un aumento significativo del 120% en la ley de oro y una reducción del 57% en la masa con mínima pérdida de oro.
Los resultados clave muestran que de una muestra de 64.8 kg con una ley de oro inicial de 5.9 g/t, el proceso de clasificación produjo 27.6 kg de producto clasificado a 12.9 g/t de oro, mientras que se rechazaron 37.2 kg de material de desecho que contenía solo 0.6 g/t de oro. El proceso retuvo con éxito el 94% del contenido de oro mientras eliminaba el 57% de la masa.
El plan minero conceptual de la empresa implica minería subterránea selectiva con procesamiento fuera del sitio en una instalación de terceros, aprovechando la proximidad del proyecto al agua de marea y a la infraestructura existente. La tecnología de clasificación de mineral, probada en las instalaciones de Steinert US Inc, utiliza sensores para separar las rocas de desecho del mineral valioso sin reactivos químicos.
그랜드 포타지 리소스 (GPTRF)는 준에 가까운 뉴 아말가 광산 프로젝트에서 센서 기반 광석 분류 테스트의 놀라운 결과를 발표했습니다. 테스트 결과 금 함량이 120% 증가하고 질량이 57% 감소했으며 금 손실이 최소화되었습니다.
주요 결과는 5.9 g/t의 초기 금 함량을 가진 64.8 kg 샘플에서 분류 과정이 12.9 g/t 금의 27.6 kg 정제 제품을 생산하면서 0.6 g/t 금만 포함된 37.2 kg의 폐기물을 제거했음을 보여줍니다. 이 과정은 질량의 57%를 제거하면서 금 함량의 94%를 성공적으로 유지했습니다.
회사의 개념적 채굴 계획은 타사 시설에서의 오프사이트 가공과 함께 선택적 지하 채굴을 포함하며, 프로젝트의 조수 근처와 기존 인프라를 활용합니다. Steinert US Inc의 시설에서 테스트된 광석 분류 기술은 화학 시약 없이 센서를 사용하여 폐암석과 귀중한 광석을 분리합니다.
Grande Portage Resources (GPTRF) a annoncé des résultats remarquables issus de tests de tri de minerai basés sur des capteurs dans son projet minier New Amalga près de Juneau. Les tests ont montré une augmentation significative de 120% de la teneur en or et une réduction de 57% de la masse avec une perte d'or minimale.
Les résultats clés montrent qu'à partir d'un échantillon de 64,8 kg avec une teneur en or initiale de 5,9 g/t, le processus de tri a produit 27,6 kg de produit trié à 12,9 g/t d'or tout en rejetant 37,2 kg de matériau de déchet contenant seulement 0,6 g/t d'or. Le processus a réussi à conserver 94% de la teneur en or tout en éliminant 57% de la masse.
Le plan minier conceptuel de l'entreprise implique une exploitation souterraine sélective avec un traitement hors site dans une installation tierce, tirant parti de la proximité du projet avec les eaux de marée et l'infrastructure existante. La technologie de tri de minerai, testée dans les installations de Steinert US Inc, utilise des capteurs pour séparer les roches de déchet du minerai précieux sans réactifs chimiques.
Grande Portage Resources (GPTRF) hat bemerkenswerte Ergebnisse aus Tests zur sensorbasierten Erzsortierung bei seinem New Amalga Mine-Projekt in der Nähe von Juneau bekannt gegeben. Die Tests zeigten einen signifikanten Anstieg der Goldgehalte um 120% und eine Reduzierung der Masse um 57% bei minimalem Goldverlust.
Die wichtigsten Ergebnisse zeigen, dass aus einer 64,8 kg schweren Probe mit einem anfänglichen Goldgehalt von 5,9 g/t der Sortierungsprozess 27,6 kg sortiertes Produkt mit 12,9 g/t Gold erzeugte, während 37,2 kg Abfallmaterial mit nur 0,6 g/t Gold verworfen wurden. Der Prozess behielt erfolgreich 94% des Goldgehalts bei, während er 57% der Masse entfernte.
Der konzeptionelle Bergbauplan des Unternehmens sieht selektiven Untertagebau mit einer Verarbeitung außerhalb des Standorts in einer Drittanbieter-Einrichtung vor und nutzt die Nähe des Projekts zum Tidewasser und zur bestehenden Infrastruktur. Die bei Steinert US Inc. getestete Erzsortiertechnologie verwendet Sensoren, um Abraum von wertvollem Erz ohne chemische Reagenzien zu trennen.
- 120% increase in gold grade through ore sorting (5.9 g/t to 12.9 g/t)
- 94% gold recovery while removing 57% of waste mass
- Reduced operating costs through decreased transportation and processing volumes
- Enhanced mining viability by enabling extraction of thinner veins
- Requires third-party processing facility for final ore treatment
- to processing particles above 1cm in size
VANCOUVER, BC / ACCESS Newswire / April 8, 2025 / Grande Portage Resources Ltd. (TSXV:GPG)(OTCQB:GPTRF)(FSE:GPB) ("Grande Portage" or the "Company") is pleased to announce results from testwork of a sensor-based ore sorting system, utilizing a composite core sample from the New Amalga Mine Project located approximately 16 miles (25 km) northwest of the city of Juneau.
Summary of Results:
| Unsorted Feed | Sorter Reject | Sorted Product |
Mass (kg) | 64.8 kg | 37.2 kg | 27.6 kg |
% Mass Distribution | |||
Gold Grade (g/t) | 5.9 g/t | 0.6 g/t | 12.9 g/t |
% Gold Distribution |
Ian Klassen, President and CEO comments: "We are extremely pleased with the results of the testwork with the Steinert ore sorting equipment, which demonstrated excellent ability to identify and reject the unmineralized particles within the sample of New Amalga material, resulting in a
Mr. Klassen continued: "These results are game changing for a host of reasons. Integrating ore sorting into the conceptual mine production plan significantly reduces the amount of mined rock requiring transportation and processing at a third-party facility, lowering per-ounce costs and also providing useful sorter-reject material for underground backfill, all without the use of chemical processing reagents. This further enhances the existing advantages of our proposed direct-ship mine configuration which utilizes offsite processing. As demonstrated by the test results, it may also create opportunities for inclusion of thinner veins into the mine plan - areas of the deposit which otherwise may not have been considered viable."
Background:
As previously announced, the Company's Conceptual Mining Plan envisions the future development of the New Amalga gold mine as a selective underground mining operation which would send ore off-site to be processed at a third-party facility, enabled by the project's location near tidewater and less than 4 miles (6.5km) from existing paved highway (Fig. 4). This results in a dramatically reduced mine site footprint due to the avoidance of chemical processing and tailings storage facilities.
The purpose of ore sorting is to quickly separate particles of waste dilution rock from the mined material, without the use of chemical reagents. The goal is to significantly reduce the volume of material that would be transported off-site to a third-party processing facility.
Grande Portage assembled a drill core composite which included both ore and waste material to reflect the dilution from wall rock (waste) which is inherent with underground blasting of narrow ore veins. The core composite was subjected to a sensor-based ore sorting test process at the facilities of Steinert US Inc, a leading global manufacturer of ore-sorting equipment.
Technical Description of Ore Sorting Test Process:
Sensor-based ore sorting can utilize a variety of measurements to determine whether a particle is ore or waste, including color, electromagnetic induction, laser, and x-ray analysis to assess elemental composition. The crushed rock is placed on a conveyor belt and then passed in front of the sensor, which rapidly analyzes the individual pieces of rock. When a piece of rock is identified as waste, a puff of compressed air redirects it to a "reject" bin. The remining pieces of rock are sent to the accepted "product" stockpile. (Fig. 2)
Fine particles too small to effectively sort are typically combined with the "product" stockpile, since higher-grade material tends to produce more fines during blasting and crushing due to the higher sulphide content and brittle nature of the quartz vein rock.
For the testwork, a series of reference samples were analyzed by the sorter machine, reflecting core material of various categories including "high grade ore", "mid grade ore", "low grade ore", and "waste". This allowed the sorter to learn the characteristics of each type of material in order to generate a sorting algorithm. Each of these reference samples were sourced from multiple drill holes at various locations within the deposit in order to capture any spatial variability in the rock characteristics.
After the sorting algorithm was developed, the composite sample was fed into the sorter machine (Fig. 3). This composite was sourced from multiple drill holes in various areas of the deposit distinct from the reference samples. It included approximately
In addition to the "product" material, three splits of "reject" material were generated from sorting the sample at progressively increasing level of selectivity, reflecting operation of the machine at various degrees of sorting criteria. All material was then assayed at SGS-Lakefield.
All three "reject" splits returned assays below the level which would be considered viable to transport and process at a third-party facility, and were therefore classified as waste, indicating that the highest level of sorter selectivity is appropriate. In total the sorter rejected
Additionally, all material was screened before assay to collect unsortable fines (<1cm), which were assayed separately. This confirmed that the fines contained a high degree of gold mineralization and are appropriate to combine with the "product" sample. A full table of results is shown below (Fig. 1).
Fig. 1: Table of Assay Results
| Reject #1 | Reject #2 | Reject #3 | Sorted Product | Unsortable Fines |
Mass (kg) | 12.2 | 13.1 | 11.9 | 22.6 | 5.0 |
Au (g/t) | 0.48 | 1.09 | 0.30 | 12.9 | 13.1 |
| Overall Waste Rejected | Overall Product | |||
Mass (kg) | 37.2 | 27.6 | |||
Au (g/t) | 0.64 | 12.94 | |||
Fig. 2: Simplified Conceptual Diagram of an Ore Sorting System
Fig. 3: Image of Ore Sorting Testwork Being Conducted on New Amalga Samples
A short video of the testwork process is available on YouTube at https://youtu.be/K4XzoRbjCXA
Fig. 4: Location of New Amalga Mine Project
Kyle Mehalek, P.E.., is the QP within the meaning of NI 43-101 and has reviewed and approved the technical disclosure in this release. Mr. Mehalek is independent of Grande Portage within the meaning of NI 43-101.
About Grande Portage:
Grande Portage Resources Ltd. is a publicly traded mineral exploration company focused on advancing the New Amalga Mine project, the outgrowth of the Herbert Gold discovery situated approximately 25 km north of Juneau, Alaska. The Company holds a
The Company's updated NI#43-101 Mineral Resource Estimate (MRE) reported at a base case mineral resources cut-off grade of 2.5 grams per tonne gold (g/t Au) and consists of: an Indicated Resource of 1,438,500 ounces of gold at an average grade of 9.47 g/t Au (4,726,000 tonnes); and an Inferred Resource of 515,700 ounces of gold at an average grade of 8.85 g/t Au (1,813,000 tonnes), as well as an Indicated Resource of 891,600 ounces of silver at an average grade of 5.86 g/t Ag (4,726,000 tonnes); and an Inferred Resource of 390,600 ounces of silver at an average grade of 7.33 g/t silver (1,813,000 tonnes). The MRE was prepared by Dr. David R. Webb, Ph.D., P.Geol., P.Eng. (DRW Geological Consultants Ltd.) with an effective date of July 17, 2024.
ON BEHALF OF THE BOARD
"Ian Klassen"
Ian M. Klassen
President & Chief Executive Officer
Tel: (604) 899-0106
Email: Ian@grandeportage.com
Cautionary Statement Regarding Forward-Looking Information
This news release includes certain "forward-looking statements" under applicable Canadian securities legislation. Forward-looking statements include estimates and statements that describe the Company's future plans, objectives or goals, including words to the effect that the Company or management expects a stated condition or result to occur. Forward-looking statements may be identified by such terms as "believes", "anticipates", "expects", "estimates", "may", "could", "would", "will", or "plan". Since forward-looking statements are based on assumptions and address future events and conditions, by their very nature they involve inherent risks and uncertainties as described in the Company's filings with Canadian securities regulators. 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. The Company disclaims any intention or obligation to update or revise any forward-looking information, whether as a result of new information, future events or otherwise, other than as required by law.
Please note that under National Instrument 43-101, the Company is required to disclose that it has not based any production decision on NI 43-101-compliant reserve estimates, preliminary economic assessments, or feasibility studies, and historically production decisions made without such reports have increased uncertainty and higher technical and economic risks of failure. These risks include, among others, areas that are analyzed in more detail in a feasibility study or preliminary economic assessment, such as the application of economic analysis to mineral resources, more detailed metallurgical and other specialized studies in areas such as mining and recovery methods, market analysis, and environmental, social, and community impacts. Any decision to place the New Amalga Mine into operation at levels intended by management, expand a mine, make other production-related decisions, or otherwise carry out mining and processing operations would be largely based on internal non-public Company data, and on reports based on exploration and mining work by the Company and by geologists and engineers engaged by the Company.
NEITHER THE TSX VENTURE EXCHANGE NOR ITS REGULATION SERVICE PROVIDER (AS THAT TERM IS DEFINED UNDER THE POLICIES OF THE EXCHANGE) ACCEPTS RESPONSIBILITY FOR THE ADEQUACY OR ACCURACY OF THIS NEWS RELEASE
SOURCE: Grande Portage Resources Limited
View the original press release on ACCESS Newswire
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