This technical report describes the San Francisco gold project in Sonora, Mexico, including processing facilities that were historically operated by Alio Gold Corporation and subsequent proposed designs under Magna Gold Corp.
Report context
This NI 43-101 F1 technical report for the San Francisco Gold Project in Sonora, Mexico was prepared with a report date and effective date of June 1, 2020. The report documents historical operations conducted by Alio Gold Corporation from 2010 to 2019, as well as proposed processing designs and metallurgical testwork results compiled for the project under Magna Gold Corp.
Processing route
Historical Operating Period (Alio, 2010–2019)
During Alio’s operating period, the San Francisco processing facilities comprised a crushing and conveying circuit, a leaching operation, and an adsorption/desorption/recovery (ADR) plant. The crushing and conveying system fed ore to the leach pads. The leaching process utilized conventional heap leach technology. The ADR plant handled gold recovery from pregnant solution through adsorption, followed by desorption and final recovery.
Proposed Processing Design
The report presents a processing description that includes crushing and conveying, leaching, and the ADR plant sections. The process plant layout is described, along with manpower requirements, consumables, and maintenance considerations for the proposed operation.
Metallurgical Testwork
Testwork was conducted by Metcon in 2012 and included discussion of test results and quality assurance/quality control procedures. Internal testwork was also performed, which included column test results. The report provides Micon comments and conclusions on the testwork findings.
Key reported parameters
| Parameter | Value | Basis |
|---|---|---|
| Processing method | Heap leach with ADR plant | Design and historical |
| Crushing and conveying | Included in circuit | Design and historical |
| Leaching | Conventional heap leach | Design and historical |
| Gold recovery | Via adsorption/desorption/recovery | Design |
| Testwork type | Column tests, 2012 Metcon testwork | Testwork |
| Quality assurance/control | Discussed for 2012 testwork | Testwork |
Project website: https://www.juniorminingnetwork.com/junior-miner-news/press-releases/896-tsx/alo/76694-alio-gold-completes-sale-of-san-francisco-mine.html
Project website: https://www.timminsgold.com/san_francisco_regional/
Technical qualifications
This report is a NI 43-101 F1 technical report that relies on information regarding Alio and the San Francisco property from previous Micon reports along with updated information. The processing section includes data from Alio’s historical operating period (2010 to 2019) and from mine plans and activities during that period. The report also documents testwork by Metcon (2012) and internal testwork including column test results.
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*Source: San Francisco Gold Project, Sonora, Mexico , NI 43-101 F1 Technical Report, report date June 1, 2020, effective date June 1, 2020, sections 1.0, 1.8, 1.9, 13.0, and 17.0.*
