Mr. Jonathan Awde reports
GOLD STANDARD REPORTS DRILLING CONTINUES TO EXPAND NORTH BULLION GOLD DEPOSIT IN CARLIN TREND, NEVADA
Gold Standard Ventures Corp. has released results from RR13-14, the most recent hole drilled (in late 2013) into the North Bullion deposit. Results include an interval of 30.6 metres of 1.23 grams per tonne gold starting at 294.7 metres and 39.9 metres of 0.65 g/t gold starting at 337.5 metres. These intervals effectively offset and extend the critical lower breccia zone another 65 metres (200 feet) to the west of RR13-11. The North Bullion deposit remains open to further expansion to the west and to the north. Another step-out, RR13-15, is set to be drilled about 65 metres farther to the west.
Gold Standard also reported that Newmont USA Ltd., a subsidiary of Newmont Mining Corp., has provided the company with the results of metallurgical tests of drill core from the North Bullion deposit conducted by Newmont. The tests were designed to determine if North Bullion deposit mineralization is amenable to the established recovery technologies commonly used for Carlin-type ores. Three samples were taken from composited quarter-cut North Bullion drill core. All three samples were considered to be refractory material. The samples assayed 2.30g g/t gold (0.067 ounce per ton), 11.7 g/t gold (0.340 ounce per ton) and 8.06 g/t gold (0.235 ounce per ton). Gold recoveries were 83.1 per cent, 90.0 per cent and 78.8 per cent, respectively, indicating that North Bullion mineralization is likely to be conducive to roaster processing.
Highlights:
- Drill holes RR13-08 and RR13-11, together with the most recent hole RR13-14, appear to indicate a west-trending bulge or extension in the
North Bullion deposit. This change in mineralization pattern could
represent an association with an important west-northwest-trending
feeder structure.
- The North Bullion gold mineralization appears to be conducive to roaster
processing.
Metallurgical test details
Three samples of material from the Railroad property were provided to Newmont. Each sample was taken from drill core and was expected to be refractory. A scope of work was generated to conduct head assays (duplicate fire assays, AuCN assays and preg-rob assays), carbon and sulphur assays with a LECO furnace, and a multielement ICP-MS assay. The samples were carbonaceous and sulphidic refractory with very different gold grades, arsenic grades and sulphide sulphur contents. All three samples responded reasonably well to bench top roast tests with recoveries between 78 per cent and 90 per cent:
- Sample No. 1 represents a 95-foot lower breccia interval from 1,200 to 1,295 feet in hole RR11-18.
- Sample No. 2 represents a 45-foot upper breccia interval from 960 to 1,005 feet in hole RR12-01.
- Sample No. 3 represents a 20-foot lower breccia interval from 1,160 to 1,180 feet in hole RR13-08.
HEAD ASSAYS
Sulphide Organic Carbonate
Au AA/FA Calc. PR sulphur carbon carbon
Sample ID (oz/t) (%) (oz/t) (%) (%) (%)
RR11-18 0.067 4.2 0.026 1.20 0.30 0.10
12-01A 0.340 13.5 0.024 3.26 0.53 0.34
13-08 0.235 2.4 0.049 6.16 0.61 0.32
FURTHER HEAD ASSAYS
Silver Arsenic Copper Mercury Nickel Zinc
Sample ID (ppm) (ppm) (ppm) (ppm) (ppm) (ppm)
RR11-18 1.08 235 20 11 40 880
12-01A 0.30 2,473 40 78 46 54
13-08 0.70 1,005 47 46 47 2,029
Roaster recoveries varied between 78.8 per cent and 90 per cent. The cause of the recovery variances was not determined. Sulphide sulphur burns were between 94 per cent and 96 per cent, and organic carbon burns were between 78 per cent and 93 per cent. The results suggest that the roast was complete. The calcines had calculated preg-rob values between zero and 0.007 ounce per ton with AA/FA ratios between 77 per cent and 84 per cent, further supporting the conclusion that all the organic carbon was burned.
ROAST TEST RESULTS
Sulphide Organic Calcine NaCN Lime
Recovery sulphur carbon calc. PR Calcine demand demand
Sample ID (%) burn (%) burn (%) (oz/t) AA/FA (%) (lb/ton) (lb/ton)
RR11-18 83.1 96 78 0.007 77 1.81 15.4
12-01A 90.0 94 90 0.000 84 1.81 21.6
13-08 78.8 96 93 0.001 76 1.01 15.2
Dave Mathewson, Gold Standard's vice-president of exploration, stated: "We are pleased with the metallurgical results for the North Bullion gold deposit. The results indicate that the refractory material is suitable to either roaster or autoclave beneficiation, and these facilities exist within reasonable trucking distance of our Railroad project. We are also excited by the continuing lateral expansion of the North Bullion deposit. Each successive hole is adding significant mineralized tonnage which we expect to be reflected in the resource estimate scheduled for later this year."
North Bullion drilling update
Gold Standard is also pleased to report the final assay results for the late 2013 North Bullion drilling campaign. Hole RR13-14 is an 85-degree east-directed hole designed to provide a west offset of the lower breccia mineralization encountered in holes RR13-08 and -11. The hole encountered a total of about 70 metres of gold mineralization within the lower breccia. Of particular importance in this hole is the style and degree of silica, barite and dolomite alteration at this distance from the Bullion fault corridor. The strength and amount of this alteration strongly suggest proximity to a system feeder structure. This hole steps farther away from the Bullion fault corridor structure zone; therefore, another feeder structure at a different location and with different orientation appears to be in play.
DRILL RESULTS
Drill hole Intercept (m) Thickness (m) Au grade (g/t)
RR13-13 Precollar set
RR13-14 284.3-285.8 1.5 0.53
294.7-325.3 30.6 1.23
Including 297.9-307.5 9.6 2.47
337.5-377.4 39.9 0.65
501.2-504.6 3.4 0.34
Sampling methodology, chain of custody, and 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 drill to the sample preparation facility was continuously monitored. Core was cut at the company's facility in Elko, and one-half was sent to the lab for analysis and the other half retained in the original core box. A blank, quarter-core duplicate or certified reference material was inserted approximately every 10th sample. The samples are delivered to ALS Minerals preparation facility in Elko. The samples are crushed and pulverized, and sample pulps are shipped to ALS Minerals certified laboratory in Vancouver. Pulps are digested and analyzed for gold using fire assay fusion and an atomic absorption spectroscopy finish on a 30-gram split. All other elements are determined by ICP analysis. Data verification of the analytical results includes a statistical analysis of the duplicates and standards and blanks that must pass certain limits for acceptance to ensure 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 in geology, CPG-10216, a qualified person as defined by NI 43-101 (standards of disclosure for mineral projects).
We seek Safe Harbor.
© 2024 Canjex Publishing Ltd. All rights reserved.