The Magistral tailings deposit consists of the deposition of rejects from historical mill workings from the mid-1900s. These tailings were deposited within a natural low relief valley to the west of the historical mill and made up of relatively unconsolidated clay/silt particles. The provenance of the reject material was from treating gold bearing granodiorites and quartz veins. The primary sources were from the nearby mines: Colorados, Recompensa, Los Angeles, and Santa Ana. Thickness varies within the tailings up to 16 m.

The Magistral tailings is host to gold, copper and silver mineralization. The longest axes of the tailings deposit are approximately 550m north–south and approximately 575 m east–west.

A portion of the tailings, reportedly 750,000 tonnes, was removed from the deposit for secondary processing between 1992 and 1996. There are a few minor workings observed on the surface of the tailings deposit from artisanal miners (gambusinos), but these are not considered to have a significant impact on the estimated mineral resources.

Mining of the tailings by small scale open pit mining methods made the most sense based on the size of the resource, grade tenor, grade distribution and location on top of topography of the deposit. AGP’s opinion is that with current metal pricing levels and knowledge of the mineralization, open pit mining offers the most reasonable approach for development.

The mine plan includes sending mineralized material to mill located adjacent to the tailings. The mine plan is based on Measured, Indicated and Inferred Mineral Resources. Any waste material encountered will be placed back within the footprint of the existing tailings facility being mined.

The mining method is excavation of the tailings by excavator or front-end loader, followed by haulage to the plant and tailings screening to remove coarse clumps, vegetation and other unwanted material, before processing. Two 20-t haul trucks are required to maintain the plant production due to the proximity of the feed material to the process plant. Some dilution along the original topographic contact is expected but should not be significant as the use of the excavator can help minimize this. Support equipment includes a track dozer, grader and water truck. No drilling and blasting is required.

The pit design was based on the revenue factor (RF) =1 pit shell. This design mined the blocks contained within the shell. Waste associated with the basal blocks, while included in the design, would be left ........

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