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May 28, 2014· Porphyry copper deposits can also be associated with epithermal gold deposits formed by the same volcanic complex above the deeperseated porphyry. If alteration occurs in carbonaterich (or volcanic) rocks, then skarn mineralisation may also develop. Exploring for Porphyry .
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
proximal goldpoor, garnetrich part of a skarn deposit is likely to be more resistant to erosion and thus more likely to crop out and be sampled than the more distal gold and pyroxenerich skarn. Economic gold skarns should be sought in the distal part of under reducing conditions.
The MisealaMasse target, where a northward extension of a skarn and massive sulfide ore body intercepted in C1720 ( meters of % copper and grams per tonne gold) was indicated; and, The southeast chargeability area, where two coppergold porphyry targets have been identified and IP located several anomalies.
Skarns are composed of calciumironmagnesiummanganesealuminum silicate minerals. 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.
Jul 14, 2010· Boxxer Gold Corp. (:BXX) is preparing to drill 26 areas of mineralized skarn and 32 geophysical (IP) targets on its owned Boss porphyry coppergold .
Jun 21, 2018· A high grade silvergold vein field and ore grade zincgold skarnhosted mineralization have been identified at Central and Lucy. ... The main drill target at Loretos is a blind skarnporphyry ...
PDF | Analysis of 55 porphyry copper deposits demonstrates a continuum between porphyry coppergold deposits emplaced at a median depth of 1 km, with a median size of 160 million metric tons of ...
HighGrade Infill Drilling Investment Opportunity in Montana''s Prolific Porphyrybased Copper Gold Camp March 2019 1. ... (14,597 tons of gold skarn, 5,208 tons copper skarn) ... Copper Gold Porphyry –Low Grade Open Cast or Underground Mining Methods 21.
Gold skarn mineralization at the Crown Jewel deposit was discovered in 1988 and current reserves stand at Mt averaging 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).
Jun 14, 2019· Learn how to Find Rich Gold Deposits in Porphyry, we are going to be talking about that in great depth and the associated Geology with Porphyry, Copper Porphyry, Skarn, ( Polymetallic replacement ...
Skarn in Carbonates: This diagram illustrates a cross section through a porphyry molybdenum deposit and its associated skarns. The skarns have formed within a carbonate bed near where it had been penetrated by igneous intrusions. Illustration by the United .
For coppermolybdenum porphyry deposits, formation is broadly concentrated in three time periods: PalaeoceneEocene, EoceneOligocene, and middle MiocenePliocene. 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 Au deposits occur in a calcsilicate alteration system that surrounds the Redline porphyry, a stock of quartz monzodiorite to granodiorite composition, 1,500 to 2,000 ft in diameter. Gold commonly occurs as free particles, most strongly associated with chalcopyrite and chlorite.
SKARNS IN THE PORPHYRY COPPERGOLD ENVIRONMENT Skarn name (location) Porphyry resource (wt % Cu, ppm Au) Skarn type and (skarn resource) Porphyry to skarn ratio Skarn protolith Big Cadia1 (NSW ...
Porphyry deposits are one of the most important sources of copper and molybdenum, and are also major sources of silver, gold, and addition, porphyry deposits may host valuable byproducts ...
The Extractive Metallurgy of Gold Gold Deposits Types: List of 10 Gold Deposit Class #1 Pegmatites are igneous rocks formed in the final stage of magma crystallization Porphyry Dyke Coarsegrained granite Albitite Gold Deposit Class #2 Carbonatite Carbonatite Related Gold Deposit Class #3 Auriferous Gold Skarn Type Deposit Gold Deposit Class #4 ...
Nov 10, 2015· Dynacor Gold Mines Inc. is very pleased to announce the discovery of a large coppergold porphyry in the northwest area of its 100 % owned .
A high grade silvergold vein field and ore grade zincgold skarnhosted 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 type: Largescale and lowgold grade. Leadzinc type: very little gold contain Distribution of Au, Ag, and Cu in skarn, pluton, and protolith of a large copper skarn system, Whitehorse copper belt, Canada (from Meinert, 1986) Skarn gold deposits 1. Related to coppermineralized porphyritic intrusions 2.
MINERALOGY AND ORIGIN OF COPPERGOLD BEARING SKARN WITHIN THE BATU HIJAU PORPHYRY DEPOSIT, SUMBAWA ISLAND, INDONESIA May Thwe Aye1,2, Subagyo Pramumijoyo2, Arifudin Idrus2, Lucas Donny Setijadji2, Akira Imai3, Johan Arif 4, and Symsul Kepli4. 1 2
Recognition of skarn zonation targeted exploration at Cadia toward the largest ore system in New South Wales. Cadia Skarns * Skarns were important to the discovery of Cadia *Recognition of skarn alteration helped to focus . exploration at Cadia toward the largest porphyry . system in Australia.
Coppergold skarns peripheral to the porphyry copper deposit in the Bingham mining district, Utah, contain a geologic resource of over 7 million tons of copper and 9 million ounces of gold. The skarn deposits, hosted by Pennsylvanian limestone beds within the contact metamorphic aureole of the Tertiary Bingham stock, have been mined ...
Chesapeake Intercepts Skarn and Porphyry Mineralization at Yarely. Vancouver, British Columbia(Newsfile Corp. June 21, 2018) Chesapeake Gold Corp. (TSXV: CKG) ("Chesapeake") wishes to provide an update on the results of the Phase 1 drilling program at its regional Yarely Project ("Yarely") in Sinaloa State, encompasses 72,000 hectares and is strategically located 10 ...
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