Epithermal Deposit

epithermal deposit

[¦ep·ə′thər·məldə′päz·ət]
(geology)
Ore deposit formed in and along openings in rocks by deposition at shallow depths from ascending hot solutions.

Epithermal Deposit

 

a type of hydrothermal mineral deposit formed at shallow depths at moderate pressures and comparatively low temperatures (200°–50°C). Epithermal deposits were identified by the American geologist W. Lindgren in 1907.

References in periodicals archive ?
The 2016 field work included 77 kilometers (km) of induced polarization surveys over four porphyry copper deposit targets nearby to IKE, 1,258 talus fine samples collected over these and three more newly emerging porphyry copper and precious metal epithermal deposit targets, and 130 [km.
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.
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.
The post-accretion extensional setting in the Mongol-Okhotsk belt possesses some similarities to that of the late Paleozoic through Jurassic Gondwana margin[15], 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 La Zanja property, another epithermal deposit amenable to open-pit mining and heap leaching, has a resource expected to reach in oz this year.
It is generally accepted that the cap of an epithermal deposit with the richest gold content is emplaced quite near the surface (but is not necessarily confined to a small vertical interval).
Historically a significant silver district, the Cachinal de la Sierra area is located within the Paleocene Gold Belt of northern Chile which hosts several significant gold and silver deposits, including Meridian Gold Inc's El Penon Silver-Gold Mine, a low sulphidation-style epithermal silver-gold deposit and one of the worlds lowest cost gold producers, 60km to the northeast, and Diamond Rose NL's Guanaco Gold Mine, a high sulphidation-style epithermal deposit which was mined as a heap leach operation during the early 1990's by Amax Gold Inc and later Kinross Gold Corporation,12km to the southwest (Figure 1).
The above geology indicates potential for a near surface epithermal deposit within the Tertiary strata or a higher grade gold deposit in the underlying Paleozic strata.
The property contains a gold epithermal deposit hosted by highly fractured sandstones of the Chimu formation and an Au-Cu porphyry deposit, directly adjacent to it.
The La Arena epithermal and porphyry deposits, covering an area exceeding 3 km2,are part of a multi phased mineralized system displaying potassic and phyllic alteration zones in the porphyry, intermediate sulfidation alteration in the adjacent gold epithermal deposit and overprinting the porphyry and finally hydrothermal and phreatic breccias.
The weight of the geological evidence suggests at Louis, including the geophysical signature, the possibility of an epithermal deposit with deeper potential to discover a causative copper-gold mineralized porphyry system.
Two gold deposit models are possible, a large sediment-hosted deposit like Jerritt Canyon or Big Springs and a large volcanic-hosted epithermal deposit like Midas.