Epithermal gold and silver deposits form in
the shallow parts of once active geothermal systems. Ore
bodies are commonly hosted in veins, many of which are
blind to the surface. The ore bodies are small in
comparison to the dimensions of the geothermal systems in
which they form, but they can contain very rich ores (bonanza
grade) and have metal contents that match the largest gold and
silver deposits in the world. The depth level of exposure is
critical in assessing the exploration potential of a prospect,
deposit or district. Correct interpretation of hydrothermal
alteration patterns is a key guide to knowing
the exploration potential of new
prospects and mature districts.
Services involving determination of alteration
mineralogy (petrography, XRD) and application of fluid
inclusions are available.