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New Found to use Chrysos method for Queensland assay
2021-11-04 20:28 ET - News Release
Mr. Craig Roberts reports
NEW FOUND PROVIDES UPDATE ON ITS QA/QC PROGRAM AND ANNOUNCES COLLABORATION WITH MSALABS TO UTILIZE CHRYSOS PHOTONASSAY METHODS FOR ITS QUEENSWAY PROJECT
New Found Gold Corp. has provided an update regarding its quality assurance/quality control program at Queensway and plans to proceed with Chrysos whole-core PhotonAssay methods for the assaying of core samples from its 100-per-cent-owned Queensway project, located on the Trans-Canada Highway 15 kilometres west of Gander, Nfld.
As part of New Found's ongoing technical and QA/QC work, independent consultants RSC recently submitted 30 half-core samples to Eastern Analytical ("EA") for assay. The other half of these drill core intervals had previously been assayed by ALS Minerals ("ALS") and incorporated into the Company's reported drill results. A scatter plot comparing these results is provided in Figure 1.
RSC has concluded that the EA half-core samples consistently returned lower grade assays than ALS assay grades for the original half-core samples, and that these data suggest a strong bias in these results that particularly seems to be present in the higher-grade samples.
Results from a set of 10 similar half-core verification samples were received and reviewed in May 2021. Differences observed in these assay results when compared to the original half-core samples were determined by New Found's independent consultants to be not statistically significant.
The Company is now proceeding with a program to further assess the presence and source of the bias, and to implement steps based on its findings.
The bias observed in the 30 verification samples could be caused by one or a combination of the following: nugget-effect, sample selection bias and/or any part of the process of sample preparation or analytical methods used at the laboratories. The certified reference material ("CRM") submitted as part of the Company's internal QA/QC program did not identify a bias at either laboratory, however it should be noted that the CRM's do not test the entire metallic screening process.
Two test programs have been designed by RSC with input from the Company to identify the potential sources of bias.
The first program will test whether there is a bias between the two labs and will involve submitting 167 half-core samples to ALS for crushing and splitting into two equal lots. The two splits are to undergo the standard metallic screening process at the two respective labs, EA, and ALS.
If a statistically significant bias is demonstrated in test program one, test program two will determine which laboratory produced the bias by collecting two sets of 60 half-core samples where one set was originally assayed at ALS and the other by EA and submitting these 120 half-core samples to a third "umpire" laboratory.
If testing program one does not indicate a bias between the labs, then the bias is likely to have been introduced during the sampling of the core in the core yard.
Both programs will run concurrently to limit further delays and the results are expected in approximately eight weeks' time. The time line for completion of this work will depend on turnaround times at the assay labs, so there may be some variability in this time line. The Company and RSC are putting all their efforts into getting this program completed as soon as possible.
In the event that the test work determines that a bias was introduced in the sampling process, the remaining half-core samples still held by the Company will be sent for assay and a weighted average of the two half-core samples will then be used to determine an updated assay.
Recognizing the nuggety nature of gold mineralization at Queensway, for the last several months New Found has been considering implementing assaying of whole-core samples. This approach provides a larger sample for assay which reduces variability of assay results particularly helpful in nuggety gold systems such as at Queensway and removes the possibility of bias from the half-core sampling process. After consultation with RSC, the Company has decided to immediately move to whole-core assay as the primary method for future assaying of drill core intervals.
As part of the implementation of whole-core assaying, the Company is in advanced discussions with MSALABS to implement the state-of-the art Chrysos PhotonAssayTM method on whole-core samples from Queensway. This method is employed around the world by other companies on nuggety gold ores with excellent results.
The Company anticipates signing an agreement with MSALABS shortly for approximately 20,000 Chrysos PhotonAssayTM assays per month at a facility outside of Newfoundland and is advancing discussions towards installing a Chrysos PhotonAssayTM instrument in Gander. As part of this arrangement the Company would work with MSALABS to establish a sample preparation facility in Gander.
The benefits of utilizing the Chrysos PhotonAssayTM method on whole-core samples include:
- The preservation of the entire whole-core sample in this non-destructive testing method leaving it available for additional assay and test work. The current fire assay technique followed by metallic screening for high-grade samples does not preserve residual material for further check assaying.
- A much faster turnaround time for assay results, providing this critical operational information that drives optimization throughout the exploration and discovery value chain.
- Significantly lower assay costs.
- An environmentally friendly, chemical-free, more sustainable replacement for the traditional fire assay methods, significantly reducing CO2 emissions and hazardous waste.
Collin Kettell Executive Chairman of New Found stated: "Management and the Board of Directors are committed to working with RSC to complete a speedy and thorough test program to assess the presence and source of this bias, as well as determine and implement a resolution that will address this issue. Queensway is a nuggety gold system which comes with significant challenges that are widely recognized in the sampling and assaying processes. Moving to whole-core assaying will reduce the variability of assay results in this style of gold mineralization and will remove the possibility of bias from the half-core sampling process. As part of this transition, we are particularly excited to be advancing towards the use of the Chrysos PhotonAssayTM assay method. This technology allows the assay of an entire high-grade interval quickly and accurately and preserves the full sample for further verification assaying by conventional fire assay/metallic screening methods. The Chrysos PhotonAssayTM assay method is gaining wide acceptance and is being used by industry leaders such as Barrick. We are excited to be forming this partnership with MSALABS to proceed towards utilization of the Chrysos PhotonAssayTM method on our Queensway samples, and to work towards installation of a third party operated Chrysos PhotonAssayTM machine in Gander."