SLAM + NINE ( should emmulate Trevali's assay method ) #1 Just aqua regia dissolution. ( most likely full digestion )
#2 No fire assay is mentioned ( bingo ) no escaping zinc or lead ) with lead flux
#3 In house lab, 3rd party lab peru ------> no brunswick lab lol
#3 Volumetric method ( BOOM ) also known as Titration.
Drill core samples were processed and assayed in the Santander mine onsite laboratory. Zinc, lead and silver, assays were obtained by Aqua-Regia dissolution followed by Atomic Absorption measurement.
Values of lead and zinc over 15% are assayed by volumetric method. Analytical accuracy and precision are monitored by the analysis of reagent blanks, reference material and replicate samples. Quality control is further assured by the use of international and in-house standards. Blind certified reference material is inserted at regular intervals into the sample sequence by Trevali personnel in order to independently assess analytical accuracy. The onsite laboratory is outsourced and managed by SGS-Peru personnel. SGS-Peru's quality system complies with the requirements for the International Standards ISO 9001:2000 and ISO 17025: 1999. Finally, representative blind duplicate samples are routinely forwarded to an ISO compliant third party laboratory for external quality control.
https://m.canadianinsider.com/trevali-intersects-significant-massive-sulphide-mineralization-outside-current-caribou-mine-resource
Hunch ?
Volumetric is the go to ( best choice )
No Zinc sublimation ( skips metal melt phase and turns to gas )
No zinc lost in fire assay which uses lead - zinc combines with lead = lead is skimmed.
Titration (also known as titrimetry[1] and volumetric analysis) is a common laboratory method of quantitative chemical analysis to determine the concentration of an identified analyte (a substance to be analyzed). A reagent, termed the titrant or titrator,[2] is prepared as a standard solution of known concentration and volume.
Phenolphthalein
A typical titration begins with a beaker or Erlenmeyer flask containing a very precise amount of the analyte and a small amount of indicator (such as phenolphthalein) placed underneath a calibrated burette or chemistry pipetting syringe containing the titrant.[18] Small volumes of the titrant are then added to the analyte and indicator until the indicator changes color in reaction to the titrant saturation threshold, representing arrival at the endpoint of the titration, meaning the amount of titrant balances the amount of analyte present, according to the reaction between the two. Depending on the endpoint desired, single drops or less than a single drop of the titrant can make the difference between a permanent and temporary change in the indicator.
https://en.wikipedia.org/wiki/Titration
Would SXL + NINE see even richer grades ( more copper + zinc ) values if,
Volumetric assaying were used ?
Wink.
