This report presents the mineral processing and metallurgical framework for the Orovalle operation in Asturias, Spain, based on the November 30, 2020, NI 43-101 technical disclosure.
Report context
The El Valle project, formally identified as the Orovalle Operation in Asturias, Spain, is the subject of a technical report dated November 30, 2020, prepared for Orovalle Minerals S.L. The report compiles historical metallurgical testwork, process design criteria, plant operating data, and production performance to support mineral resource and reserve estimates. This article summarizes the processing and metallurgical information presented in that report, distinguishing between historical data, design parameters, and recent investigation results; no update on project status or ownership beyond the report date is provided.
Processing route
History of Metallurgical Testing
The processing section of the 2020 technical report begins with a review of metallurgical testing history for the Orovalle Operation. Historical testwork informed the original process design and has been supplemented by more recent investigations. The report does not detail the full sequence of historical test programs but indicates that established metallurgical knowledge underpins the current processing approach.
Mineralogy and Process Design
Mineralogical characterization was used to define the process design for the Orovalle operation. The report describes the relationship between ore mineralogy and the selected process flowsheet, which was developed to treat ore from the El Valle district. The design criteria show the mineralogical characteristics identified during testwork.
Recent Metallurgical Investigations
Recent metallurgical studies are summarized in the report, though specific testwork procedures and numerical outcomes are not itemized in the available report extract. These investigations were undertaken to verify or update the process design, and their results are stated to support current plant operations.
Plant Production Review
The report includes a review of plant production history, with throughput and recovery data reported as actual operational results. Production figures are presented without extrapolating beyond the measured data.
Plant Performance
Plant performance metrics are reported for the period reviewed, detailing achieved recoveries and plant availability against design expectations. The report notes discrepancies between design and actual performance where applicable.
Saleable Products
The processing route produces saleable concentrates, the specification of which is outlined in the report, including transport and marketing assumptions; however, no product quantities or contract terms are given.
Key reported parameters
| Parameter | Unit | Basis | Value |
|---|---|---|---|
| Resource Throughput (annual) | Mt/y | Design | Not disclosed in extract |
| Gold Recovery (oxide) | % | Plant actual | Not disclosed in extract |
| Gold Recovery (sulphide) | % | Historical testwork | Not disclosed in extract |
| Silver Recovery | % | Plant actual | Not disclosed in extract |
| Copper Recovery | % | Testwork | Not disclosed in extract |
| Concentrate Grade | , | Design/specification | Not disclosed in extract |
| Process Availability | % | Plant actual | Not disclosed in extract |
| Water Recovery | % | Plant actual | Not disclosed in extract |
| Grind Size | µm | Process design | Not disclosed in extract |
Project website: https://orovalle.es/
*Values are not provided in the original report extract for these parameters; the table format follows the structure required by the technical report sections cited.*
Technical qualifications
- The report does not provide a complete flowsheet diagram, and only the extraction of process descriptions is possible from the available text.
- Metallurgical testwork details, including sample selection, test conditions, and accuracy, are not described within the report extract.
- Plant production and performance figures are reported as historical operating data and do not constitute forecasts or guarantees of future performance.
- The report does not address tailings management, water balance, or reagent consumption in the processing sections summarized here.
- No economic analysis is included in this article; the source technical report contains no such analysis within the processing sections.
- The report does not state that all testwork or plant data have been independently verified; reliance is placed on company-provided information.
Source: Technical Report on the Orovalle Operation, Asturias, Spain, dated November 30, 2020, Sections 13, 17.
