Drilling by
To date, seven holes have tested the downdip and down-plunge extension of one of several zones mined during the 1930s.
Hole 2 returned 10.63 oz. gold per ton over 6 ft. (between 145 and 151 ft.), whereas hole 3 hit 8.62 oz. gold and 1.3 oz. silver over 6.5 ft (from 146 to 152.5 ft.). Lower-grade mineralization was also returned from the zone, which consists of sheared and brecciated quartz vein material and quartz stringers.
Results are still awaited for holes 4 and 5, both of which intersected zones of sheared and brecciated quartz veining similar to that encountered in previous holes. Holes 6 and 7 are being logged and sampled.
Romios has retained William Utterback, a former chief geologist for the Sleeper gold mine in Nevada, to manage the program at Scossa.
An underground program by
The stockwork zone was discovered while driving a drift to establish a drill station in the hangingwall of the San Amado shear zone. Thirty-seven channel samples from the drift returned values ranging from 0.04 gram gold and less than 3 grams silver to 42.5 grams gold and 2,080 grams silver. Five sample sets taken from the back of the last 11.5 metres of the drift had a weighted average of 9.2 grams gold and 497 grams silver per tonne.
Gammon Lake notes that more work is required to determine the geometry and dimensions of the newly discovered zone. Drilling will test the structure. In the meantime, the company is continuing its drilling program at Ocampo, with equipment now at work in the Plaza de Gallos-Refugio area.
A final, bankable feasibility study has been completed for the Don Mario gold-copper deposit in Bolivia, paving the way for
The LMZ is reported to host minable reserves totalling 848,000 tonnes grading 15.55 grams gold. Of this total, 246,000 tonnes grading 10.19 grams are minable by open-pit methods. The remaining 602,000 tonnes grading 17.74 grams are minable by underground methods (long-hole open stoping, with some shrinkage stoping). Initial production will come from the small open pit, followed by underground mining at the daily rate of 750 tonnes.
The study examined a simple crush, grind and carbon-in-leach cyanidation circuit, which is projected to achieve a 93% recovery for gold. Capital costs are estimated at US$33.38 million, whereas annual production is expected to average more than 127,000 oz.
On its own, Orvana completed an in-house evaluation of the Upper Mineralized zone (UMZ) at Don Mario. This project hosts an oxide resource of 2.4 million tonnes grading 1.66 grams gold, 51.9 grams silver and 1.94% copper, while the transition/sulphide resource contains 1.9 million tonnes grading 2.26 grams gold, 48.9 grams silver and 1.39% copper.
The preliminary study suggests that an open-pit, mining operation is viable. Such an operation would use a combination of heap-leaching, solvent extraction-electrowinning and milling.
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