| Description |
57 DGGS rock samples were crushed with a Terminator oscillating jaw crusher with chrome steel alloy plates so that at least 70 percent of the material passes 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 a chrome steel ring mill so that 85 percent of the sample passed through a -200 mesh (75 micron) screen. Trace-element analyses were performed using representative splits of each 250 gram pulp. Samples were assayed for gold by inductively coupled plasma-atomic emission spectroscopy following a 30 gram (g) fire assay fusion (FA-ICP-AES). Platinum and palladium were assayed for selected samples by inductively coupled plasma-atomic emission spectroscopy following a 30 g fire assay fusion (FA-ICP-AES). Trace-element analyses were performed by inductively coupled plasma-atomic emission spectroscopy (ICP-AES) methods after four-acid, near-total digestion. This method of digestion is possibly incomplete for Ba, Cr, Ti, and W and may result in lower analytical results for these elements. Rock samples with trace gold and/or copper 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 30 gram sub-sample; copper, inductively coupled plasma-atomic emission spectroscopy (ICP-AES) methods after four-acid, near-total digestion. |