Vista Gold Corp. (NYSE American:VGZ) (TSX: VGZ) announced positive results for the two remaining holes in Phase 2 of the ongoing drilling program at the Company’s 100% owned Mt Todd gold project located in Northern Territory, Australia.
VB21-012 – Intersected over 100 meters of mineralization, inclusive of three zones of +1 grams gold per tonne subvertical vein-sets
VB21-013 – Drilled perpendicular to VB21-002 and VB21-005 to validate structural orientation
Frederick Earnest, President and CEO of Vista, commented, “Phase 2 of our drilling program successfully achieved our primary objective of identifying multiple areas north of the Batman deposit where additional resources might be added most efficiently in the future. In all, we drilled 3,725 meters in this phase and intersected good intervals and gold grades in each hole. We have verified continuity of gold mineralization extending from the Batman deposit northeast over 1.4 km and down dip more than 400 meters. Holes VB21-012 and VB21-013 are the last two holes in this phase of drilling. Our next phase of drilling will provide some infill to our drilling to date, but importantly, continue to step out toward the Quigleys deposit.”
“We were very pleased to have received a grant from the Northern Territory Government under its Geophysics and Drilling Collaborations Program (the “Program”) to co-fund VB21-012. This gave us the opportunity to drill a hole directed at increasing our understanding of the geology as we move north of the Batman deposit. The Program awarded $1.7 million in grants to support a diverse range of exploration drilling programs and geophysical surveys across the Northern Territory. Mt Todd was one of 15 successful projects to receive a grant from a total of 38 applicants. Fifty percent of the applicable direct drilling and assay costs, up to a maximum of A$110,000, will be co-funded from the Program.”
“Hole VB21-012 was drilled to a total depth of 901 meters. The primary objective was to intersect the granite intrusive. From our drilling at Batman, we expected the intrusive to be present at a depth of approximately 800 meters. We did not intercept the intrusive, but gained a great deal of information about the basement rocks at Mt Todd. And while not the primary objective of this hole, we intersected three zones of +1 g Au/t material within a broad zone of mineralization. Hole VB21-013 was drilled to validate the orientation of our drilling and to provide the assurance that we have not introduced a bias into our understanding of the structures due to drillhole orientation. I’m pleased with the thoroughness of our exploration programs and our understanding of the geology and resource growth potential in the area north of the Batman deposit.”
Mr. Earnest concluded, “In addition to the ongoing exploration, completing a definitive feasibility study (“DFS”) for Mt Todd will be an important milestone and catalyst. We are pleased to report that engineering and other work related to the DFS is on schedule and on budget. We are closely reviewing interim reports and look forward to announcing the results of the DFS in Q1 of 2022. Australia is making significant progress in achieving its vaccination goals and we are hopeful this will lead to a relaxing of the present travel restrictions, which will play an important role in obtaining a strategic development partner.”
Table 1 – Summary of Assay Results
|Hole No.||Grid Co-ordinates||Survey Data||Intersections|
|VB21-012||188435.0||8436405.0||155.0||260.9||-50.0||901.0||469.0||479.0||10.0||6.4||1.29||HQ ½ Core|
|including||477.0||479.0||2.0||1.3||4.48||HQ ½ Core|
|and||503.0||525.7||22.7||14.6||1.10||HQ ½ Core|
|and||555.3||579.2||23.9||15.3||0.77||HQ ½ Core|
|including||566.0||579.2||13.2||8.5||1.03||HQ ½ Core|
|VB21-013||187423.0||8436409.0||169.0||86.4||-53.0||311.9||130.0||136.0||6.0||3.9||1.25||HQ ½ Core|
|and||144.0||156.0||12.0||7.9||3.11||HQ ½ Core|
|including||144.0||148.6||4.6||3.0||1.62||HQ ½ Core|
|including||151.0||154.0||3.0||2.0||2.67||HQ ½ Core|
|(i)||Results are based on 50g fire assay for Au.|
|(ii)||Intersections are from diamond core drilling with half-core samples with 1 meter representative samples.|
|(iii)||Core sample intervals were constrained by geology, alteration or structural boundaries, intervals varied between a minimum of 0.2 meters to a maximum of 1.2 meters.|
|(iv)||Mean grades have been calculated on a 0.4 g Au/t lower cut-off grade with no upper cut-off grade applied, and maximum internal waste of 4.0 meters.|
|(v)||All intersections are downhole intervals and reflect approximate true widths.|
|(vi)||All downhole deviations have been verified by downhole camera and/or downhole gyro.|
|(vii)||Collar coordinates surveyed by Earl James & Assoc., an independent surveyor, using Trimble R8 GNSS.|
|(viii)||The Company maintains a quality assurance/quality control (“QA/QC”) program, as further described below.|
|(ix)||The assay laboratories responsible for the assays were Northern Analytical Laboratories Pty Ltd (“NAL”), an independent ISO 9000 certified lab, Pine Creek, NT and Genalysis Laboratory Services Pty Ltd, Perth, WA, which is also independent from Vista.|
Discussion of Results
VB21-012 was drilled to test the potential depth of the granitic intrusive under the Northern and Southern Cross zones and for an enriched zone within the Southern Cross Zone (“SXZN”) close to the intrusive. While VB21-012 did not intersect the intrusive, alteration intensity did increase with depth and, as veining persisted, the hole was pushed an additional 100 meters past planned depth (see Figure 2). VB21-012 has shown that the SXZN, both persists and thickens with depth. The SXZN has three +1 g Au/t zones with an overall width of 100 meters (when aggregated), with dip continuity of +500 meters and a strike length of approximately 1.1 km. Vein assemblages consist dominantly of quartz, pyrrhotite, chalcopyrite, and sphalerite, with galena occasionally present. The SXZN appears similar to the NXZN, which exhibits the potential to host grades twice that of the Batman deposit.
Consistent with our standard drilling protocols, VB21-012 was drilled with oriented core and has provided orientation data for bedding, veining and structures that will greatly assist in understanding the mineralizing controls and targeting future drilling.
VB21-013 was planned to intersect the Northern Cross Zone from the west instead of the east as drilled previously on section 6400N (approximately 1,000 meters north of the existing Batman Pit). VB21-013 intersected the NXZN between the intercepts in holes VB21-005 and VB21-002, while also confirming the thickness of the structure by intercepting it from the opposite direction. Structural measurements have indicated that at section 6400N, the NXZN mineralized veins are subvertical and strike nearly north-south. The veins vary in thickness and number. The NXZN has intersected four zones to date, two of which are very well developed on section 6400N.
The NXZN was intersected where predicted and displays strong upper and lower contact mineralization. Hole VB21-013, drilled from west to east, has shown a tighter, higher-grade structure than the holes drilled east to west. The revised drill direction appears appropriate and is consistent with the measured vein orientations of the high-grade.
A portion of future work will focus on defining high-grade mineralization within the NXZN, which is open in all directions.
Photos – Drill intercepts from VB21-013 showing mineralization
Figure 1 – Plan View of Drill Holes
Figure 2 – Cross Section with VB21-012
Figure 3 – Cross Section with VB21-013 and interpreted zones
The sampling method and approach for the surface geochemistry and grab samples is as follows:
Rock chip and soil geochemical samples are routinely collected to determine if the potential exists for anomalous gold values below the surface. The presence of anomalous gold grades is not a guarantee of subsurface mineralization. While both rock chip and soil samples have sampling procedures, it is not considered rigorous enough to be relied upon for use in the estimation of mineral resources. Surface soil and rock chip samples are merely considered to be potential indicators of subsurface mineralization. Since the rock chip and soil assays are not used in mineral resource estimation, it is rare that any additional QA/QC or check assaying would be completed. The data are used on an as received basis.
It is the QP’s (as defined below) opinion that the sample preparation methods and quality control measures employed before dispatch of samples to an analytical or testing laboratory ensured the validity and integrity of samples taken.
John Rozelle, Vista’s Sr. Vice President, a Qualified Person (“QP”) as defined by Canadian National Instrument 43-101 – Standards of Disclosure for Mineral Projects, has verified the data underlying the information contained in and has approved this press release. The information contained in this press release does not change any of the mineral resources or reserves estimates contained in Vista’s October 7, 2019 NI 43-101 Technical Report, Mt Todd Gold Project, 50,000 tpd Preliminary Feasibility Study, Northern Territory, Australia. The information contained in this press release is provided to inform the reader of the growth of our geologic understanding of the Project. There has been insufficient exploration to define a mineral resource with respect to the exploration target areas and it is uncertain if further exploration will result in the exploration target areas being delineated as a mineral resource.
Data Verification and QA/QC
The sampling method and approach for the drillholes are as follows:
Processing of the core included photographing, geotechnical and geologic logging, and marking the core for sampling. The nominal sample interval was one meter. When this process was completed, the core was moved into the core cutting/storage area where it was laid out for sampling. The core was laid out using the following procedures:
The core was then cut using diamond saws with each interval placed in sample bags. At this time, the standards and blanks were also placed in plastic bags for inclusion in the shipment. A reference standard or a blank was inserted at a minimum ratio of 1 in 10 and at suspected high grade intervals additional blanks sample were added. Standard reference material was sourced from Ore Research & Exploration Pty Ltd and provided in 60 g sealed packets. When a sequence of five samples was completed, they were placed in a shipping bag and closed with a zip tie. All of these samples were kept in the secure area until crated for shipping.
Samples were placed in crates for shipping with 100 samples per crate (20 shipping bags). The crates were stacked outside the core shed until picked up for transport and shipped to NAL in Pine Creek, Northern Territory, for standard fire assays. At the lab, the samples are pulverized and split down to 50-gram assay samples prior to assaying. The industry-standard 3 assay-ton fire assay is followed by an atomic absorption (AA) finish, except where results report a result of greater than 3 g Au/tonne, and then a gravimetric finish is used to report final results.
The QP is satisfied that sample security measures meet industry standards. Statistical analysis of the various drilling populations and QA/QC samples has not identified or highlighted any reasons to not accept the data as representative of the tenor and grade of the mineralization estimated at the Batman deposit.
About Vista Gold Corp.
Vista is a gold project developer. The Company’s flagship asset is the Mt Todd gold project located in the Tier 1, mining friendly jurisdiction of Northern Territory, Australia. Situated approximately 250 km southeast of Darwin, Mt Todd is the largest undeveloped gold project in Australia and, if developed as presently designed, would potentially be Australia’s fourth largest gold producer on an annual basis, with lowest tertile in-country and global all-in sustaining costs. All major operating and environmental permits have now been approved.
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