お知らせ • Feb 04
Gold Basin Resources Corporation Announces Metallurgy Testwork Confirms Excellent Gold Recoveries at Cyclopic Area of Gold Basin Project
Gold Basin Resources Corporation announced to report on its initial Bottle Roll Metallurgical Leach Testwork conducted in December 2021 on samples from the Cyclopic area of its 100%-owned Gold Basin project in Mohave County, Northern Arizona, USA. Gold Basin submitted a total of 126 oxide-gold sample interval composites to metallurgy and process design experts Kappes, Cassiday & Associates ("KCA") in Reno, Nevada in late October 2021. KCA sorted, weighed and composited these samples into sixteen (16) separate composite samples, which were then prepared with approximately 80% passing 1-2mm in size for bottle-roll leach testwork. Samples were selected from four PQ diamond drill holes drilled in four areas of the Cyclopic deposit to provide a distribution laterally and vertically through the deposit (Map 1). The 72-hour leach tests demonstrate the potential for excellent extraction (recovery) for the Cyclopic oxide ore. 25% of the samples returned gold recoveries of over 80% and a further 50% above 70% gold recovery. Sodium cyanide consumptions ranged from 0.01 kilograms per metric tonne to 0.09 kilograms per metric tonne, which is on the lower side of typical consumptions. Hydrated lime additions ranged from 0.50 kilograms per metric tonne to 1.50 kilograms per metric tonne. A comprehensive work program is currently underway on PQ core from the Cyclopic deposit that was provided to KCA in November 2021. The program was designed to provide at least a Scoping Study level of accuracy and will include 60-day column leach tests and a detailed dataset on the metallurgical recovery characteristics of the core. The Company will report on these results as they become available. KCA is independent of the Company. The Company drilled four diamond drill holes using PQ core. The core was transported to a cutting facility in Nevada where it was cut and logged by Gold Basin contractors. The cut core was sampled on 5 foot intervals with half the core retained. Coarse blank material and standard reference pulps are inserted into the sample stream and three standard reference pulps at three different gold grades (0.154 ppm, 0.778ppm, and 2.58ppm) are being used. One 1.52m drill interval in every four intervals is weighed in order to monitor recovery. Samples were transported to American Assay Lab ("AAL") in Reno, Nevada. Prior to shipping, all assay samples are maintained under the direct control and supervision of the on-site geological staff. Upon arrival in Reno, Nevada at AAL, the samples are prepared using AAL code PV03 procedure (pulverize 0.3kg split to 85% passing 75 micron) and fire-assayed for gold using AAL code FA-PB30-ICP procedure (30gm fire with ICP-OES finish). AAL also inserts its own certified reference materials plus blanks and duplicates. All preparation, assaying and metallurgical studies were performed utilizing accepted industry standard procedures. Bottle roll leach testing was conducted on a portion of each composite sample. A 5,000, 4,000 or 1,000 gram portion of as-received head material was utilized for leach testing. The bottle roll test procedure is outlined in the following: A 5,000, 4,000 or 1,000 gram split of composite material was placed into a 15 litre carboy and slurried with 7,500, 6,000 or 1,500 millilitres of Reno municipal tap water, respectively. The slurry was mixed thoroughly and the pH of the slurry checked. The pH of the slurry was adjusted, as required, to 10.5 to 11.0 with hydrated lime. Sodium cyanide was added to the slurry to a target amount of 1.0 gram per litre. The bottle was then placed onto a set of laboratory rolls rolling intermittently (2 minutes per hour). The slurry was checked at 2, 4, 8, 24, 48, and 72 hours for pH, dissolved oxygen (DO), NaCN, Au, Ag and Cu. dditional hydrated lime and sodium cyanide were added after each sample period, if required, to adjust the slurry to the target levels. 6. After completion of the leach period, the slurry was filtered, washed and dried. The tailings were split out into duplicate portions and individually ring and puck pulverized to 80% passing 0.075 millimetres. The pulverized portions were then assayed for residual gold and silver content. The reject material was stored.These laboratory tests were conducted with hydrated lime for pH control. ichael Povey M.Sc BSc.(Hons), M.Aus IMM, a qualified person as defined by NI 43-101, has reviewed the scientific and technical information that forms the basis for this news release and has approved the disclosure herein. Mr. Povey has verified the data disclosed in this news release, and has reviewed the applicable report (KCA0210118_CYC01_03 dated 30/12/2021). Mr. Povey is not independent of the Company as he is the CEO and a director of the Company and holds securities of the Company.