OREAS 238c

OREAS 238c is prepared from a blend of Fosterville high-grade ore and barren hornfels–metasedimentary units sourced from multiple deposits across Victoria.

The primary gold-bearing component is sourced from the world-class Fosterville Gold Mine, located approximately 20 km east of Bendigo in central Victoria. Gold mineralisation at Fosterville occurs as disseminated arsenopyrite and pyrite in quartz–carbonate veinlet stockworks, with additional visible gold developed as fine specks and vein-hosted accumulations associated with stibnite-rich (Sb) mineralisation.

The barren fraction comprises a large proportion of Tulla hornfels, Geosoil basalt, and minor Stawell Au quartz–sulphide ore, all milled to high uniformity. These materials represent metamorphosed turbidites, hornfelsed sediments, and basaltic units typical of the Victorian goldfields, providing a robust and geologically compatible host matrix.

OREAS 238c has been characterized using the following methods:

• Gold by Pb collection fire assay (25-50g charge weight) with AAS and ICP-OES finish
• Gold by Bi collection fire assay (30 g charge weight) with AAS finish
• Gold by PhotonAssay™
• Gold by 15-50g aqua regia digestion with ICP-MS and AAS finish
• Gold by cyanide leach (20-200g) with AAS or ICP-MS finish
• Full ICP-OES and ICP-MS elemental suites by 4-acid (HNO3-HF-HClO4-HCl) digestion
• Full ICP-OES and ICP-MS elemental suites by aqua regia digestion

Certified values for applicable analytes are operationally defined for each method, with results under OREAS ISO 17034 scope of accreditation.