Challacollo is a low-sulphidation epithermal deposit
which hosts a historic 30 million silver ounce Indicated Mineral Resource (4.7 million tonnes at 200 g/t silver) and a 6.9 million silver ounce Inferred Mineral Resource (1.6 million tonnes of 134 g/t), with associated gold credits.
The partially outcropping Mount Aubrey deposit is considered to be a low-sulphidation, silica-rich epithermal deposit
. However, the source of the gold-bearing fluids is not clear, and could either be granitic, structurally-controlled orogenic, or magmatic (related to the accumulation of the Dulladerry Volcanics).
The epithermal deposit
is originally defined by Lindgren (1933).
On the basis of geological characteristics, stable isotopic analysis, and the mineralization temperature, there are two main views that were proposed to interpret its genesis, for example, (1) subvolcanic rock-hosted medium-low temperature hydrothermal deposit  and (2) epithermal deposit
In addition, a combination of consistent stratigraphy and a strong continuous structural environment makes the Tenoriba project highly prospective to host a significant epithermal deposit
," stated Ian Foreman, P.Geo, Yale's President.
Most western readers will recognize orogenic, intrusion-related, skarn, and Carlin-type deposits as being described within the first three groups of host rocks, and the epithermal deposit
types as being discussed within the volcanic rock-related section of the book.
We have since made a recommended takeover bid for Laguna Resources NL which has a silver/gold deposit in Chile, which, being a low sulphidation epithermal deposit
, has many of the characteristics of Chatree.
The post-accretion extensional setting in the Mongol-Okhotsk belt possesses some similarities to that of the late Paleozoic through Jurassic Gondwana margin, which is characterized by major gold concentrations such as the Cerro Vanguardia low-sulphidation epithermal deposit
, Argentina, and the Kidston orthomagmatic breccia pipe, Queensland, Australia.
The Julcani gold-silver-lead-copper mine, operated by Compania de Minas Buenaventura (Buenaventura), is an example of an economic IS epithermal deposit
associated with rhyolitic domes in similar regional setting as Riqueza.