Mr. Jonathan Awde reports
GOLD STANDARD REPORTS CYANIDE SOLUBLE RECOVERIES OF 82.4% FOR THE PINION OXIDE GOLD DEPOSIT, CARLIN TREND NEVADA
Gold Standard Ventures Corp. has released favourable metallurgical results from the first comprehensive work designed to determine the metallurgical characteristics at the Pinion oxide gold deposit, Carlin trend, Nevada. Cyanide soluble recoveries averaged 82.4 per cent in oxidized multilithic dissolution collapse breccia, the main gold host at Pinion, indicating that this material is likely to support heap leach processing. Results will be used in a planned 2015 Pinion resource estimate, and to refine upcoming bottle roll testing.
Highlights
Cyanide-soluble gold results, from oxidized multilithic breccia
(mlbx) sample pulps, provided the recoveries shown in the associated table.
Mineralized Number of Number of Gold
area samples drill holes recovery
Far north zone 171 8 85.7%
North zone 144 6 85.7%
Main zone 211 8 81.1%
Northwest Pinion 87 7 86.3%
Southeast central 171 10 85.0%
East Pinion 114 6 83.4%
Northwest south zone 162 5 81.1%
Southeast south zone 137 7 72.0%
Cyanide-soluble gold assays confirm the consistently oxidized nature of
gold mineralization within the Pinion deposit.
Excellent correlation exists between the visual logging of oxidized
zones containing hematite and/or limonite in drill samples and the
cyanide-soluble gold assays. This ease of identification should support
an efficient mining operation.
The robust nature of the Pinion mineralizing system has resulted in
broadly based gold deposition outside of the primary mlbx host. The
test program demonstrates that gold mineralization in these zones is
also highly cyanide soluble and therefore potentially exploitable with
the mlbx in a combined, larger deposit. A total of 102 samples from
oxidized and mineralized units other than the mlbx achieved a cyanide-soluble average of 84.2 per cent. These units include the Tripon Pass
limestone, Chainman formation sandstone and Tonka formation
conglomerate.
Cyanide-soluble silver assays averaged 45.7 per cent based on 1,173 mineralized
and oxidized mlbx samples in 57 drill holes.
At Southeast Pinion, one-third of the multilithic breccia samples in
two holes returned lower cyanide recoveries of gold and, lower
recoveries were also obtained throughout the breccia in a third hole,
PIN15-03. These intercepts with lower recovery were previously
recognized from visual logging as not oxidized, and are therefore not
included in the modelled multilithic breccia gold zone.
Cyanide solubility analyses were completed on all of Gold Standard's 2014 and 2015 drill samples that returned fire assay values of greater than 0.14 gram per tonne gold (g/t Au), the cut-off grade established by Apex Geoscience Ltd. of Edmonton, Canada, in its National Instrument 43-101 resource estimate announced on Sept. 10, 2014 (see news release). The laterally continuous multilithic dissolution collapse breccia (mlbx), which is the most important gold mineralization host at Pinion, was the primary focus for this testwork. The cyanide solubility analyses were one-hour leach tests performed on 1,299 drill sample pulps from 59 drill holes distributed throughout the deposit, using the ALS Minerals Au-AA13 method. Cyanide leach analyses were also performed for silver using the ALS Minerals Ag-AA13 method.
Mac Jackson, Gold Standard's vice-president of exploration, stated: "These good cyanide-soluble recoveries are very consistent within the oxidized multilithic host breccia at Pinion and indicate that the gold is leachable. These results confirm and correlate well with our visual logging of oxide material and categorization of gold zones in our resource model. They will also help us design bottle roll tests for the next part of our metallurgical program."
Sampling methodology, chain of custody, quality control and quality assurance
All sampling was conducted under the supervision of the company's project geologists and the chain of custody from the GSV's Elko office to the sample preparation facility was continuously monitored. Sample pulps were delivered to ALS Minerals preparation facility in Elko, Nev., and shipped to ALS Minerals' certified laboratory in Vancouver, B.C. Pulps were analyzed for silver using the Ag-AA61 method. Cyanide-soluble assays were determined by the Au-AA13 and Ag-AA13 methods. Data verification of the analytical results includes a statistical analysis of the standards and blanks that must pass certain parameters for acceptance to insure accurate and verifiable results.
The scientific and technical content and interpretations contained in this news release have been reviewed, verified and approved by Steven R. Koehler, Gold Standard's manager of projects, BSc, geology, and CPG-10216, a qualified person as defined by NI 43-101, standards of disclosure for mineral projects.
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