Fe skarn model, Hammarstrom and others, this volume). Total sulfide mineral content at the McCoy, Nev., gold skarn is low ( <2 volume percent) and many sulfide minerals are oxidized. In contrast, at the Fortitude, Nev., gold skarn about 30 km to the north, high grade ore is sulfide mineral rich, and includes mostly pyrrhotite as well as
Skarn deposits are economically valuable as sources of metals such as tin, tungsten, manganese, copper, gold, zinc, lead, nickel, molybdenum and iron.  A skarn is formed by a variety of metasomatic processes during metamorphism between two adjacent lithologic units.
For copper-molybdenum porphyry deposits, formation is broadly concentrated in three time periods: Palaeocene-Eocene, Eocene-Oligocene, and middle Miocene-Pliocene. For both porphyry and epithermal gold deposits, they are generally from the time period ranging from the middle Miocene to the Recent period., however notable exceptions are known.
The East orebody and West orebody were copper-gold skarn deposits located along the north margins of the Copper Canyon granodiorite body, mined in the 1970s. The Fortitude Deposit is a world-class gold-silver skarn deposit that was discovered north of the West orebody in late 1980.
Carbonatites and carbonatite-related deposits. Auriferous skarn and gold skarn type deposit. Gold/Silver and vise-versa veins, lodes, mineralized pipes and irregular silicified deposits in fraction, faults + zones. Auriferous veins, lodes, sheeted zones, saddle reefs in faults and fractures.
Skarn deposits are also zoned in this mineral system, with Cu-rich skarns generally very close to the causative intrusion, but Zn-Pb-rich skarns more distal. An important feature of the porphyry-epithermal mineral system is the telescoping of different deposit types, for instance porphyry Cu-Au-Mo deposits and epithermal deposits of various types.
gold skarn and porphyry gold crusher for sale Gold Bearing Skarns USGS Publications Warehouse ly, which is for sale in microfiche from the U.S. Geological Survey, Books and Open File Reports ....
In recent years, a significant proportion of the mining industry's interest has been centered on discovery of gold deposits; this includes discovery of additional deposits where gold occurs in skarn, such as at Fortitude, Nevada, and at Red Dome, Australia.
The metal zonation suggests that gold and copper mineralisation at the Vulture Prospect is linked to a proximal intrusive source located at depth to the immediate north of the Vulture skarn. CONCLUSIONS . The discovery of porphyry-related gold and copper mineralisation at Ferndale demonstrates:
Gold skarn mineralization at the Crown Jewel deposit was discovered in 1988 and current reserves stand at 8.7 Mt averaging 6.0 g/t Au, for a total of 52 t Au, although the deposit is still in a protracted permitting phase (Bob Derkey, Washington Department of Natural Resources, personal communication).
Gold grades are less than 0.05 ppm in the porphyry copper-molybdenum deposits. Between these end members is an economically important group containing significant amounts of both gold and ...
porphyry copper-gold deposit. The main difference is the level of erosion; Tingi Valley porphyry system is less eroded than Ok Tedi and therefore almost totally preserved Exploration targets are: o Porphyry style copper-Gold mineralisation (in Angali and Andiria Creeks). o Skarn Gold —Base metal on the intrusive margins with the limestone.
Loretos Prospect. The main drill target at Loretos is a blind skarn-porphyry system indicated by the significant high chargeability anomaly. The first hole, Y-04, cut more than 200 metres of ...
EPITHERMAL GOLD-SILVER and PORPHYRY COPPER-GOLD EXPLORATION - Short Course Manual Greg Corbett Incomplete DRAFT as at February 2018 ... 22.214.171.124 Porphyry Cu 126.96.36.199 Skarn 1.2.2 7 Linkages between deposit types 1.3. Conclusions and exploration implications 2 Hydrothermal alteration
porphyry system from the geophysical survey at Loretos. A high grade silver-gold vein field and ore grade zinc-gold skarn-hosted mineralization have been identified at Central and Lucy. The geological and geophysical work to date suggests Yarely could host several porphyry type targets which would be the first known in this region of the country.
Porphyry copper deposits are among the largest reservoirs of gold in the upper crust and are important potential sources for gold in lower temperature epithermal deposits.
SKARNS IN THE PORPHYRY COPPER-GOLD ENVIRONMENT. ... The Batu Hijau, skarn associated porphyry Cu–Au deposit is located in the southwestern part of Sumbawa Island, Indonesia. Skarn …
Porphyry deposits are one of the most important sources of copper and molybdenum, and are also major sources of silver, gold, and tin.In addition, porphyry deposits may host valuable by-products ...
Copper skarn deposits occur near many porphyry copper host intru- sions that intruded carbonate-bearing units (Einaudi and others, 1981), and skarn mineral zoning patterns may be useful in the targeting of a potentially associated porphyry copper deposit (Meinert and others, 2005).
Potter, D., 1996, What makes the Grasberg anomalous, implications for future exploration, in Porphyry related copper and gold deposits of the Asia Pacific region: Conference Proceedings, Australian Mineral Foundation, Glenside, South Australia, p. 10.1 10.13.
Copper, gold, and molybdenum are among the important minerals extracted from these deposits. For modeling purposes a simplified porphyry model was constructed based on known geologic information (Titley, 1982, and Pierce, 1995). An idealized porphyry copper system is shown in Figure 12.12.
A high grade silver-gold vein field and ore grade zinc-gold skarn-hosted mineralization have been identified at Central and Lucy. The geological and geophysical work to date suggests Yarely could host several porphyry type targets which would be the first known in this region of the country.
Porphyry copper deposits can also be associated with epithermal gold deposits formed by the same volcanic complex above the deeper-seated porphyry. If alteration occurs in carbonate-rich (or volcanic) rocks, then skarn mineralisation may also develop.
The Golden Hill Au-Cu deposit, east evolution of a gold-rich porphyry copper deposit at Guinaoang, central Cuba, in Geological Association of Canada/Mineralogical Luzon, Philippines, in Asian Mining '85, pp 15-26 (Institution of Association of Canada Annual Meeting, Final Pwgram and …
That skarn had a high enough grade to allow it to continue to be mined from underground. The Big Gossans copper gold skarn deposit is the highest grade deposit in the Grasberg area. Reserves of 37,000,000 tons at 2.7% copper, 1 g per ton gold and 16 g of per ton silver that's about $240 to $250 a …
porphyry systems, including that the ore deposits can be significant resources of gold, and that epithermal and skarn deposits are genetically and spatially associated with porphyry deposits in many mineral districts. Other significant contributions that improved our understanding of porphyry ore
In the broad sense, a skarn is a silicate-rich metamorphic rock. Skarns may or may not host economic reserves of metals; if they do, they are called Skarn deposits. Skarns are considered the premier source of tungsten but may also host valuable amounts of other metals, including copper, gold, lead, iron, zinc and molybdenum.
Boxxer Gold Corp. (TSX.V:BXX) is preparing to drill 26 areas of mineralized skarn and 32 geophysical (IP) targets on its owned Boss porphyry copper-gold project in the Goodsprings Mining ...
generated by magmatic activity. Skarn deposits are spatially associated with porphyry Cu-Mo deposits and polymetallic veins and replacements (Cox and Singer, 1986). Recent studies focusing on the behavior of gold in porphyry systems show that gold mineralization can occur in multiple locations within the same system.
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