- El Oro, Mexico
- El Dorado, Western Mexico
- SDA Plant, Western Mexico
- Cocula, Western Mexico
- El Oro Tailings Opportunity, Mexico
The SDA plant consists of a flotation plant which also includes a precious metals leach circuit - Merrill Crowe system and associated assets, licenses and agreements. The plant has a ten year operating history at 100 tonnes per day but can be expanded to process mined material at a rate of up to 200 tonnes per day. Historically its operation has been based on sales of flotation concentrates to smelters, and payment for precious metals content. The plant lies within the rich Sierra Madre Occidental mineralized belt, which historically has yielded millions of ounces ("oz") of precious metals and offers multiple high grade gold and silver epithermal vein opportunities.
The mill was operational from 2007 (by Minerales Vane S.A. de C.V.) until April 2017, processing material from various operations in the region on a both a profit sharing and toll basis. The toll materials were tested prior to processing to estimate recoveries and concentrate grades. Typical reported recoveries were in the range 85 to 92% for gold and 72 to 77% for silver. The mill operated as recently as February 2019 for processing of a bulk sample of approximately 600 tonnes. Due Diligence uncovered the requirements for usual wear and tear maintenance estimated at $95,000 to restore the mill to functional condition in order to receive and run a 1,000 tonne bulk sample from El Dorado. The Company has initiated discussions for potential lines of credit facilities with offtake groups.