お知らせ • Sep 24
Vista Gold Corp. Announces Final Results from Phase 2 Drilling at Mt Todd Gold Project
Vista Gold Corp. 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 (“Mt Todd” or the “Project”) located in Northern Territory, Australia. Hole VB21-012: 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. 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 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. Hole VB21-013: VB21-013 was planned to intersect the Northern Cross Zone (“NXZN”) 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. The sampling method and approach for the surface geochemistry and grab samples is as follows: Soil samples are planned on a regular grid and a sample sheet is generated. GPS is used to locate sample positions and a pelican pick is used to clear debris and any topsoil from the sample location 3. The hole is dug to the B horizon and 7 to 10 kg of soil is collected and coarse sieved to remove stones etc., a fine mesh is then employed and the entire sample recovered post sieving is bagged. Soil sampling is usually undertaken in the dry season, however if wet samples are obtained, they are dried in the logging shed prior to sieving. Sample bags are calico and purchased pre-numbered, these are then packaged in groups of 5 for transportation to NAL, an independent ISO 9000 certified lab, Pine Creek, NT and Genalysis Laboratory Services Pty Ltd, Perth, WA, which is also independent from Vista. As the site is closed to public access, no special security measures are undertaken. A sample submission sheet is sent to the lab, detailing required methodology, and number of samples. No identifying data relating to sample location is recorded on the bags submitted or the paperwork beyond bag numbers. 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. Data Verification and QA/QC: The sampling method and approach for the drillholes are as follows: The drill core, upon removal from the core barrel, is placed into plastic core boxes; The plastic core boxes are transported to the sample preparation building; The core is marked, geologically logged, geotechnically logged, photographed, and sawn into halves. One-half is placed into sample bags as one-meter sample lengths, and the other half retained for future reference. The only exception to this is when a portion of the remaining core has been flagged for use in metallurgical testwork; The bagged samples have sample tags placed both inside and on the outside of the sample bags. The individual samples are grouped into “lots” for submission to NAL, a certified lab, for preparation and analytical testing; and All of this work was done under the supervision of a Vista geologist. 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: One meter depth intervals were marked out on the core by a member of the geologic staff; Core orientation (bottom of core) was marked with a solid line when at least three orientation marks aligned and used for structural measurements. When orientation marks were insufficient an estimated orientation was indicated by a dashed line; Geologic logging was then done by a member of the geologic staff. Assay intervals were selected at that time and a cut line marked on the core. The standard sample interval was one meter, with a minimum of 0.2 meters and a maximum of 1.2 meters; Blind sample numbers were then assigned based on pre-labeled sample bags. Sample intervals were then indicated in the core tray at the appropriate locations; and Each core tray was photographed and restacked on pallets pending sample cutting and stored on site indefinitely.
