au ag epithermal

Epithermal deposits with bonanza Au–Ag veins in the northern Great Basin (NGB) are spatially and temporally associated with Middle Miocene bimodal volcanism that was related to a mantle plume that has now migrated to the Yellowstone National Park area The Au–Ag deposits formed between 16 5 and 14 Ma but exhibit different mineralogical compositions the latter due to the

Hot Creek Epithermal Au

• Low-sulfidation epithermal Au-Ag targets with similar host rocks geology and alteration to Tuscarora bonanza vein hosted mines to south • 41 widely-spaced historic drill holes with grades up to 1 04 g/t Au over 12 2 meters and 0 34 g/t Au over 117 3 meters • Surface rock-chip vein samples have grades up to 2 29 g/t Au Details

They are amongst the largest epithermal Au-Ag deposits in the United States (Goldfield 131 t Au Tonopah 5420 t Ag) and have high average ore grades compared to other epithermal Au-Ag deposits around the world (Goldfield 16 7 g/t Au Tonopah 679 g/t Ag) (Simmons et al 2005 D John U S Geological Survey written communication 2016)

24 chemical trends observed in individual minerals are comparable to those of Au-Ag 25 low-sulphidation epithermal Au-Ag mineralizations of the Kremnica and neighboring Štiavnica 26 and Hodruša-Hmre Ore Districts however the pronounced enrichment in selenium is a specific 27 feature of the studied vein only

The Rosia Poieni porphyry Cu-Au and Rosia Montana epithermal Au-Ag deposits are the largest operating mines in the South Apuseni mineral district Romania Rosia Montana is a breccia-hosted low- to intermediate-sulfidation epithermal system related to strong phreatomagmatic activity due to shallow

Origin of epithermal Ag–Au–Cu–Pb–Zn mineralization in

The Guanajuato epithermal district is one of the largest silver producers in Mexico Mineralization occurs along three main vein systems trending dominantly northwest–southeast: the central Veta Madre the La Luz system to the northwest and the Sierra system to the east Mineralization consists dominantly of silver sulfides and sulfosalts base metal sulfides

The Kencana Au-Ag low-sulfidation epithermal deposit situated in the Neogene magmatic arc of Halmahera Eastern Indonesia has an estimated resource of 4 4 Mt 27 9 g/t Au containing 4 Moz Au The deposit forming part of the Gosowong Goldfield is the third and most recently discovered (2002) deposit in the goldfield after the Gosowong and Toguraci deposits

Best trench intersections include Au up to 4 7 g/t Ag up to 120 g/t no drilling of new vein system Rio Seco: top of epithermal system broad anomalous gold silver intersections in high level veining including 15 6 m 0 29 g/t Au 50 9 g/t Ag and 2 14 m 3 06 g/t Au 72 9 g/t Ag New geophysics identifies new drill targets

The Gosowong epithermal Au-Ag deposit located on Halmahera Island eastern Indonesia has a resource of 0 99 million metric tons (Mt) at 27 g/t Au and 38 g/t Ag Host rocks consist of Miocene shallow marine intermediate-basic volcanic and volcaniclastic rocks The structural setting consists of an elongate dome with associated tensional fracturing trending parallel to

The Rosia Poieni porphyry Cu-Au and Rosia Montana epithermal Au-Ag deposits are the largest operating mines in the South Apuseni mineral district Romania Rosia Montana is a breccia-hosted low- to intermediate-sulfidation epithermal system related to strong phreatomagmatic activity due to shallow

Epithermal Gold Deposits Part 1!

Epithermal Gold Deposits Part II Geology and Gold Deposits of the Oatman District Northwestern Arizona By Ed DeWitt Jon P Thorson 1 and Robert C Smith2 Abstract Mines in the Oatman mineralized district near Oatman in northwestern Arizona have produced more than 1 98 million ounces of gold from mid-Tertiary epithermal silver-

Ermolin E et al 2018 Epithermal Au deposit model on the basis of the integrated AMT studies in Chukotka Abstract 24th EM Induction Workshop Helsingr Denmark August 12-19 2018 3 / 4 cross-section as the high resistivity area (Figure 3-III blue-purple area within 0760-1000 stations on the altitude from 450 to 200 m)

Epithermal Au-Ag deposits form in the upper 1 km of the crust and are therefore best preserved in the less eroded Pacific rim arcs although also recognised elsewhere Two profoundly different ore fluid types give rise to low and high-sulfidation styles apparent as variations in ore and gangue mineralogy as well as characteristic zoned wall rock alteration Low sulfidation epithermal Au

Epithermal Au-Ag deposits form in the upper 1 km of the crust and are therefore best preserved in the less eroded Pacific rim arcs although also recognised elsewhere Two profoundly different ore fluid types give rise to low and high-sulfidation styles apparent as variations in ore and gangue mineralogy as well as characteristic zoned wall rock alteration Low sulfidation epithermal Au

The Mt Carlton Au-Ag-Cu deposit northern Bowen basin northeastern Australia is an uncommon example of a sublacustrine hydrothermal system containing economic high-sulfidation epithermal mineralization The deposit formed in the early Permian and comprises vein- and hydrothermal breccia-hosted Au-Cu mineralization within a massive rhyodacite porphyry (V2 open pit) and stratabound Ag

(a) Location of some representative Au–Ag deposits at southern Kyushu (b) Geological cross section around the Honko and Sanjin ore zones at the Hishikari deposit (partly modified after Sekine et al 2002) 'ML' denotes the mine meter level

25B Epithermal Au

25B Epithermal Au-Ag Mineral Deposit Models (Cox Singer model number or other) Low sulphidation (adularia-sericite type) deposits (LS) (25A 25B 25C 25D) High sulphidation (acid-sulphate type) deposits (HS) (25E)* Commodities Au Ag (+ Cu*) % Global Production 15% major source of Au in the US which is No 2 in world terms

volcanic rock-hosted epithermal Au-Ag deposits and prospects in the Waitekauri area of the southern Hauraki goldfield North Island New Zealand (Figs 1 2) The area has been well drilled and we present alteration and vein min-eralogy and

Exploration Project Deposit type: Au-Ag Epithermal Permit Details: EP54216 Owharoa 28 km2 EP53469 Waitekauri 30 km2 Seeking Expressions of Interest: New Zealand Gold Project Laneway Resources Project Overview Laneway's New Zealand tenure within the Hauraki goldfields district comprises two granted exploration permits covering approximately

The Discovery and Geology of the Salares Norte Epithermal Gold-Silver Deposit Northern Chile AME ROUNDUP January 2017 Funnel shaped ore body Initial inferred resource: 3 3 Moz Au 3 9 g/t Au and 42 1 Moz Ag 48 9 g/t Ag ** **Gold Fields Mineral Resources and Mineral Reserve Supplement to the Integrated Annual Review 31 December 2015

The Mt Carlton Au-Ag-Cu deposit northern Bowen basin northeastern Australia is an uncommon example of a sublacustrine hydrothermal system containing economic high-sulfidation epithermal mineralization The deposit formed in the early Permian and comprises vein- and hydrothermal breccia-hosted Au-Cu mineralization within a massive rhyodacite

High sulphidation epithermal Au-Ag mineralisation The controls for high sulphidation epithermal Au deposits are strongly dependent upon the evolution of the hydrothermal fluid during ascent to higher crustal levels from the intrusion source at depth (Corbett in prep)

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