SILVER RECOVERIES TO DATE AVERAGE 65.6%, BY COLUMN CYANIDE LEACH TESTS OF OXIDE AND MIXED MINERALIZATION AND EXCEED HISTORIC PRODUCTION RECOVERIES
SILVER AND GOLD RECOVERIES AVERAGE 78% AND 82% RESPECTIVELY, BY FLOTATION-CYANIDATION OF SULPHIDE MINERALIZATION
Highlights:
- Silver and gold recoveries or extractions average 57.2% and 31.5% respectively, for column cyanide leach tests on oxides and mixed oxide-sulphide mineralization core samples, utilizing material crushed to 1" with conventional cone crushing. (Drill hole location is shown in Figure 1).
- These recoveries increase to 65.6% silver and 35.2% gold, for the same oxide and mixed mineralization samples when crushed to 1.7mm with HPGR.
- Silver recoveries from the oxide and mixed core samples continue to increase during the period tested (see Figure 2).
- Column cyanide leach recoveries from sulphides average 47.2% silver and 0.3% gold, utilizing material crushed to 1" with conventional cone crushing.
- Cyanide leach recoveries from sulphides increase to 59.3% silver and 1% gold with 1.7mm HPGR crushing.
- Sulphides, however, are better recovered by flotation where lead and zinc can also be recovered. Flotation extractions average 62% silver, 72% gold, 50% lead and 37% zinc.
- The sulphide results above are improved by leaching the flotation tails. Flotation followed by cyanidation of the tails increases the extractions to a range between 71% to 84% silver (average 77.5%) and 75% to 89% gold (average 82%).
- Sulphides in Candelaria are at this time only a small percentage of the deposit but are expected to increase as drilling continues at depth.
- Silver recoveries from oxide and mixed core samples reported to date exceed the historic recoveries of 51% reported during the open-pit, heap-leach life of the mine.
- Column leach test recoveries from the three surface bulk samples are:
- 30% to 40% silver and 48% to 63% gold for mixed material crushed to 1.7 mm with HPGR.
- 48% silver and 76% gold for oxide material crushed to 1.7 mm with HPGR.
- Silver recoveries from bulk samples are lower than anticipated due to the abundance of clays in the material tested, which is not representative of the overall in-ground mineralization.
See the Company's news release dated
Figure 1. Location of metallurgical samples and drill holes in the area of
Figure 2. Percent silver extraction vs days of leaching for oxide, mixed and sulfide core samples. Diamond drill hole (DDH) locations shown in Figure 1. DDH 132 and 133 are sulphide samples (drill holes SO-C-22-132 and SO-C-22-133), DDH 134 and 135 are oxide samples (drill holes SO-C-22-134 and SO-C-22-135), DDH 136 and 137 are mixed (oxide-sulphides) samples (drill holes SO-C-22-136 and SO-C-22-137). The material tested includes the entire mineralized zone intersected by each drill hole (20.9m to 31.2 m wide, average 25.5 m) and the head grades vary from 98 g/t to 359 g/t silver and 0.24 g/t to 0.71 g/t gold.
Qualified Person
The technical content of this news release has been reviewed and approved by
About Silver One
Silver One is focused on the exploration and development of quality silver projects. The Company owns a 100%-interest in its flagship project, the past-producing
The Company has staked 636 lode claims and entered into a Lease/Purchase Agreement to acquire five patented claims on its Cherokee project located in
Silver One holds an option to acquire a 100% interest in the
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Phone: 604-974–5274
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Forward-Looking Statements
Information set forth in this news release contains forward-looking statements that are based on assumptions as of the date of this news release. These statements reflect management's current estimates, beliefs, intentions and expectations. They are not guarantees of future performance.
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For more information, please contact:
Phone: 604-974–5274
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Email : gary@strata-star.com
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