| Description |
Preparation for 221 samples was conducted at the ALS Chemex sample preparation facility. Rock samples were crushed with a Terminator oscillating jaw crusher with chrome steel alloy plates so that at least 70 percent of the material passed through a -10 mesh (2 mm) screen. Representative aliquots of 250 grams each were taken using a stainless steel riffle splitter. These samples were then pulverized in an Essa ring mill bowl and pucks made of Essa?s Standard Steel alloy so that 85 percent of the sample passed through a -200 mesh (75 micron) screen. Trace-element analyses and non-carbonate-carbon analyses were performed using representative splits of each 250 gram pulp. All potentially mineralized samples were assayed for gold by inductive coupled plasma-atomic emission spectroscopy following a 30g fire assay fusion (FA-ICP-AES) (Au-ICP21). Platinum and palladium were assayed for selected samples by FA-ICP-AES. (PGM-ICP23) Trace-element geochemical analyses were performed by inductive coupled plasma-atomic emission spectroscopy (ICP-AES) methods after four-acid, near-total digestion. (ME-ICP61) This method of digestion is possibly incomplete for some elements and may result in lower analytical results for these elements. Non-carbonate-carbon content was determined using a LECO furnace after a dilute acid digestion (C-IR06). Rock samples with trace-metal values above the detection limit in the initial trace-element geochemical analysis were reanalyzed for those metals by the following methods: gold, fire assay with a gravimetric finish using a 30g sub-sample (FA-GRAV) (Au-GRA21); Phosphorus, by ICP-AES methods after high-grade four-acid, near-total digestion; and arsenic and/or zinc by ICP-AES methods after high-grade four-acid, near-total digestion. For the trace-element geochemical analyses, the results of one DGGS-standard sample differs from its known composition by more than one standard deviation; all samples in this 20-sample batch are noted in the trace-element-geochemistry layer by an asterisk (*) next to the sample number. |