The Nuestra Senora polymetallic deposit in Sinaloa state, Mexico, continues to shape up as an underground mine-to-be for Scorpio Mining (SPM-T, SMNPF-O).
The new drilling on the Nuestra Senora mineral deposit is confirming previously calculated resource grades with locally higher-grade zones delivering silver grades over 1 kg per tonne. Drilled widths generally range from 0.5 to 6 metres, with a few ranging as high as 7.7 metres and the widest at 20.7 metres.
Previous feasibility work has outlined a reserve of 1.1 million tonnes on the Nuestra Senora zone, at 167 grams silver per tonne with 3.24% zinc, 0.98% lead and 0.55% copper.
Drilling on the September 9 Zone, about 75 metres north of the main Nuestra Senora deposit, has shown the zone has a strike length around 125 metres and a vertical extent of about 60 metres. Drilling has not closed the zone off at depth.
Recent drill holes, from the 9th, 10th and 11th levels of the mine workings, have indicated widths mainly between 1 metre and 5 metres, though locally wider. Silver grades are mainly between 100 and 200 grams per tonne, but holes drilled from the 10th level showed grades between 200 and 350 grams. Lead and zinc grades have mainly run higher than resource grades, mostly in the 4% to 7% range.
The zone was previously estimated to have a reserve of 221,000 tonnes at 127 grams silver per tonne, plus base metal grades of 2.97% zinc, 1.42% lead and 0.42% copper.
Development work on the project continues. Site preparation is essentially complete, and foundations excavated for the mill, crusher, and main buildings. Scorpio has its two ball mills, one of which is fully refurbished and the other is in the electrical shop. A hydro line and substation are in place and a new road has been built.
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