Tocvan Announces Completion of Gold-Silver Bulk Sample Leaching Process
05.07.2023 | The Newswire
More Positive Results as Final Recovery Pending
Highlights
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Leaching Process Concluded, July 4, 2023 - Tocvan Ventures Corp. (the "Company") (CSE:TOC) (OTC:TCVNF) (FSE:TV3), is pleased to provide an update and sampling results from a Bulk Sample being completed at its Pilar gold-silver project in Sonora, Mexico. The leaching process has concluded, and the Company's technicians are now washing and prepping the leach pad for final sampling, decommissioning and precious metal recovery. The leaching process was active for 44 days, extracting gold and silver from over 800 tonnes of bulk sample material. Sampling of the Bulk Sample material was completed in May, (News Release, May 16, 2023) results from ALS (Hermosillo) provided an average grade of 1.9 g/t Au and 12.7 g/t Ag. An onsite laboratory was used to sample the pregnant solution during the program with weekly duplicate samples sent to certified labs LTM (Hermosillo) and SGS (Durango). LTM (Hermosillo) will provide an official calculated head grade and recovery of gold and silver based on their final analysis of the data. The Company is pleased with the progress of data capture throughout the process and encouraged by the early indications of successful gold and silver recovery.
Agitated Leach Update
As previously announced, an additional 350 tonnes of crushed material and 250 tonnes of raw-bulk sample are available for gravity recovery and later agitated leach testing. Samples collected from the fine fraction of screened material not included in the heap leach pile averaged 2.1 g/t Au and 14.8 g/t Ag. The fine fraction along with additional bulk sample material will be used in testing gravity recovery methods with later agitated leach, as suggested by the leaching study completed by LTM, showing potential for the high recovery of both gold and silver. A new agitated cyanide bottle roll test by LTM of 20 Mesh material has returned 81% recovery of Gold and 99% recovery of Silver after a 72-hour retention time. Over the retention time, a moderate low sodium cyanide consumption of 0.47 kg/t and moderate CaO consumption of 1.72 kg/t were recorded. LTM recommends bottle roll studies be completed for three different grind sizes (100 Mesh, 140 Mesh and 200 Mesh) to evaluate the impact to extraction.
"We are extremely excited to have successfully completed this important step and await the final results imminently." Stated Brodie Sutherland, CEO. "The data we have received so far has all been very encouraging and suggests heap leach recovery at Pilar will match or exceed the recoveries recorded at neighboring open pit mines. In addition, continued studies of the gravity and agitated leach recovery methods look to prove an even stronger case for high gold and silver recovery at Pilar through advanced techniques."
Plate 1. A. Technicians preparing solution samples. B. Lab Technicians collecting analytical data. C. Heap Leach Pile.
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Click Image To View Full SizeDiagnostic Leach Study Summary
Full results from the Diagnostic Leach Study are available on the Company's website and in the March 29th news release. A summary is provided below.
Table 1. Summary of Results from the Precious Metals Diagnostic Leach Study completed by LTM.
Sample ID
Location
Head Screen Assay
Gravity Concentrate Assay
Total Recoverable by Gravity and Agitated Cyanide Leach
Au (g/t)
Ag (g/t)
Au (g/t)
Ag (g/t)
Au (%)
Ag (%)
494741
Main Zone (Surface)
6.2
23
76.2
237
95
78
494743
Main Zone (Surface)
8.2
68
117.0
1152
98
97
494745
Main Zone (Surface)
2.7
9
35.6
82
97
90
494747
4-T (Surface)
20.4
74
290.3
568
98
85
494749
Main Zone (Drill Core)
24.9
9
231.1
53
99
73
Share Issuance
In accordance with the financing completed on June 28, 2022, the Company has issued 59,137 common shares at a deemed price of $0.475, as payment for interest accrued on Convertible Notes. The Company currently has 39,985,107 Common Shares outstanding.
About the Pilar Property
The Pilar Gold-Silver property has recently returned some of the regions best drill results. Coupled with encouraging gold and silver recovery results from metallurgical test work, Pilar is primed to be a potential near-term producer. Pilar is interpreted as a structurally controlled low-sulphidation epithermal system hosted in andesite rocks. Three primary zones of mineralization have been identified in the north-west part of the property from historic surface work and drilling and are referred to as the Main Zone, North Hill and 4-T. The Main Zone and 4-T trends are open to the southeast and new parallel zones have been recently discovered. Structural features and zones of mineralization within the structures follow an overall NW-SE trend of mineralization. Mineralization extends along a 1.2-km trend, only half of that trend has been drill tested so far. To date, over 23,000 m of drilling has been completed.
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2022 Phase III Diamond Drilling Highlights include (all lengths are drilled thicknesses):
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116.9m @ 1.2 g/t Au, including 10.2m @ 12 g/t Au and 23 g/t Ag
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108.9m @ 0.8 g/t Au, including 9.4m @ 7.6 g/t Au and 5 g/t Ag
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63.4m @ 0.6 g/t Au and 11 g/t Ag, including 29.9m @ 0.9 g/t Au and 18 g/t Ag
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2021 Phase II RC Drilling Highlights include (all lengths are drilled thicknesses):
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39.7m @ 1.0 g/t Au, including 1.5m @ 14.6 g/t Au
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47.7m @ 0.7 g/t Au including 3m @ 5.6 g/t Au and 22 g/t Ag
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29m @ 0.7 g/t Au
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35.1m @ 0.7 g/t Au
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2020 Phase I RC Drilling Highlights include (all lengths are drilled thicknesses
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94.6m @ 1.6 g/t Au, including 9.2m @ 10.8 g/t Au and 38 g/t Ag;
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41.2m @ 1.1 g/t Au, including 3.1m @ 6.0 g/t Au and 12 g/t Ag ;
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24.4m @ 2.5 g/t Au and 73 g/t Ag, including 1.5m @ 33.4 g/t Au and 1,090 g/t Ag
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15,000m of Historic Core RC drilling. Highlights include:
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61.0m @ 0.8 g/t Au
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16.5m @ 53.5 g/t Au and 53 g/t Ag
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13.0m @ 9.6 g/t Au
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9.0m @ 10.2 g/t Au and 46 g/t Ag
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About Tocvan Ventures Corp.
Tocvan is a well-structured exploration development company. Tocvan was created in order to take advantage of the prolonged downturn in the junior mining exploration sector, by identifying and negotiating interest in opportunities where management feels they can build upon previous success. Tocvan has approximately 39.9 million shares outstanding and is earning 100% into two exciting opportunities in Sonora, Mexico: the Pilar Gold-Silver project and the El Picacho Gold-Silver project. Management feels both projects represent tremendous opportunity to create shareholder value.
Brodie A. Sutherland, P.Geo., CEO for Tocvan Ventures Corp. and a qualified person ("QP") as defined by Canadian National Instrument 43-101, has reviewed and approved the technical information contained in this release.
Quality Assurance / Quality Control
Samples were shipped for sample preparation to ALS Limited in Hermosillo, Sonora, Mexico and for analysis at the ALS laboratory in North Vancouver. The ALS Hermosillo and North Vancouver facilities are ISO 9001 and ISO/IEC 17025 certified. Gold was analyzed using 50-gram nominal weight fire assay with atomic absorption spectroscopy finish. Silver and other elements were analyzed using a four-acid digestion with an ICP finish. Control samples comprising certified reference samples and blank samples were systematically inserted into the sample stream and analyzed as part of the Company's robust quality assurance / quality control protocol. Duplicate samples of cyanide solutions are submitted to LTM (Laboratorio Tecnológico de Metalurgia), in Hermosillo, Sonora. LTM facilities are an ISO 17025 and ISO 9001:2015 certified lab. A second duplicate of cyanide solutions are submitted to SGS in Durango. Gold and silver are analyzed using 30 g nominal weight fire assay with AA finish for Au and gravimetric determination for Ag. Other elements are analyzed using aqua regia digestion with an ICP finish.
Cautionary Statement Regarding Forward Looking Statements
This news release contains "forward-looking information" which may include, but is not limited to, statements with respect to the activities, events or developments that the Company expects or anticipates will or may occur in the future. Forward-looking information in this news release includes statements regarding the use of proceeds from the Offering. Such forward-looking information is often, but not always, identified by the use of words and phrases such as "plans", "expects", "is expected", "budget", "scheduled", "estimates", "forecasts", "intends", "anticipates", or "believes" or variations (including negative variations) of such words and phrases, or state that certain actions, events or results "may", "could", "would", "might" or "will" be taken, occur or be achieved.
These forward-looking statements, and any assumptions upon which they are based, are made in good faith and reflect our current judgment regarding the direction of our business. Management believes that these assumptions are reasonable. Forward-looking information involves known and unknown risks, uncertainties and other factors which may cause the actual results, performance or achievements of the Company to be materially different from any future results, performance or achievements expressed or implied by the forward-looking information. Such factors include, among others, risks related to the speculative nature of the Company's business, the Company's formative stage of development and the Company's financial position. Forward-looking statements contained herein are made as of the date of this news release and the Company disclaims any obligation to update any forward-looking statements, whether as a result of new information, future events or results, except as may be required by applicable securities laws.
There can be no assurance that forward-looking information will prove to be accurate, as actual results and future events could differ materially from those anticipated in such statements. Accordingly, readers should not place undue reliance on forward-looking information.
For more information, please contact:
Brodie A. Sutherland, CEO
820-1130 West Pender St.
Vancouver, BC V6E 4A4
Telephone: 1 888 772 2452
Email: ir@tocvan.ca
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