Oct 01, 2002nbsp018332Gold abundances in porphyry copper deposits vary greatly, complicating efforts to define gold-rich porphyry copper deposits. The original definition was based on the AuMo ratios of porphyry copper deposits with no reference to their copper content, and resulted in the suggestion that gold-rich deposits were found largely in island arc regions Kesler, 1973.Get A Quote
Understanding Geology of Porphyry Copper Deposits and formations using models around the World. Porphyry Copper Deposits are the largest source of CuMoAu.
Here lets understand the geology ofporphyries and iron oxide copper gold deposits or IOCG as they are known. These are somewhat the giants of the ore deposits world. As a mining interested learner, the geology of porphyry copper deposits is vital to your education.
This primary mineraliing event yield only low grade mineraliation, grades of 0.3 to 0.9 copper less than 1 almost always are typical for primary grade porphyry mineraliation with each pulse in fluid extending to enrich the final grade more pulses of fluid the higher the final grade. The mineraliation frequently forms a halo around the intrusion both in the intrusion itself and in the surrounding host rocks. It8217s marked in the red hatch pattern in the cross section.
Jul 15, 2019nbsp018332A transition between alkaline epithermal and porphyry deposits are observed epithermal deposits with grading downward into or overprinting porphyry-type copper-gold deposits. In alkaline porphyry.
Here are some of the biggest porphyries in the world you can see that these range in sie from 2,000,000,000 tons up to Chuquicamata at a whopping 16,000,000,000 tons with a pit that is over 800 m deep or 2600 feet. Bingham which I showed a couple of slides back is a relative baby in this family a few economic porphyries are smaller than 100,000,000 tons but although they are big they are very low grade. Here are some of those same deposits arranged in order according to copper grade. They range from 0.5 copper up to just under 1 copper.
Compare those grades to those in Congo from with an average copper equivalent of 5 copper and you can see why they have to be big to make a profit and compete. This is not a porphyry deposit it8217s one of the Central African copper belt style of deposit. If you take into account the probable cut off you can see how small the margins are porphyry deposits are very sensitive to metal prices. These examples are some of the cadillacs of the ore deposit worlds but other lower grade porphyry deposits can become uneconomic with just a 20 drop in copper price.
Here are some random drill results from Serengetis property in British Columbia which is more typical of the recent porphyry discoveries. Intercepts were checked against them are potentially economic the others are probably not and as you can see that maybe only 50 of those intercepts might possibly make any money.
Vancouver, British Columbia--Newsfile Corp. - November 6, 2020 - Orestone Mining Corp. TSXV ORS FSE O2R1 WKN A2DWW7 is pleased to announce that the drill contractor has been selected with drilling at the Captain project estimated to start November 15, 2020. The 100 percent owned Captain gold-copper project hosts a porphyry system which encompasses a cluster of large targets see website for maps located 41 kilometres north of Fort St. James and 30 kilometres south of the Mt. Milligan copper-gold mine in north central British Columbia.
Previous drilling on two of the eastern anomalies T1 and T2, along a strike of 700 metres intersected three intervals of 91 to 164 metres in length with values averaging 0.30 gt gold and 0.06 copper. In Hole C12-05 intervals of 6.1 and 9.1 metres encountered higher grades of 4.45 gt gold and 6.46 gt gold with 0.51 and 0.27 copper respectively Orestone Mining News Release September 09, 2020.
The exploration model is mononite porphyrys with hydrothermal breccia ones interpreted as the feeder ones or the plumbing system for gold-copper mineraliation. The hydrothermal breccias, as demonstrated by drilling in anomaly T2 feature intense potassic-magnetite-carbonate alteration and are bracketed by mononite porphyry intrusive and interpreted NW trending magnetic low fault linears. The magnetic low linears in turn bracket the 200 metre wide magnetic high anomaly of target T2.
Logistics for the drill program are excellent as all of the drill locations are on existing roads with easy access 1-1.5 hours north of Fort St James in north central BC. The Captain Project features relatively flat terrain, moderate tree cover and an extensive network of logging and Forest Service roads suitable for exploration year around. All permits are in place for 24 drill locations.
In summary, all of the mineralied intercepts encountered on the Captain Project to date indicate that a gold enriched porphyry system exists and we now believe that we have refined the target model to unlock the propertys potential. The upcoming drill program will test two of the larger targets at the Captain project and we are moving swiftly to get underway, stated David Hottman, CEO and Director of Orestone Mining Corp.
Nov 06, 2020nbsp018332The project hosts a gold-copper porphyry system which encompasses a cluster of large targets see website for maps located 41 kilometres north of.
1 day agonbsp018332DGAP-News Doubleview Gold Corp. Key words Drilling Result09.11.2020 0905 The issuer is solely responsible for the content of this announcement.Visible Gold Occurrence in Drill Core at Hat Gold Rich Copper Porphyry DepositVANCOUVER, BC ACCESSWIRE November 9, 2020 Doubleview Gold Corp quotDoubleviewquot, the quotCompanyquot TSXVDBG is pleased to report that during.
So how do we explore for Porphyry Copper Deposits which are completely covered by barren younger rocks Well lets back up a bit, we know that porphyries form under large subduction related volcanoes and that most of these are located under the ring of fire around the subducting pacific plate another fertile subduction one occurs in Balkans, Turkey, Iran and Pakistan. So this gives us a.
At the Resguardo Project in Chile, following a review of the results from the recent reverse circulation drilling program, the low copper gold values encountered on our primary target do not justify further work and Orestone will terminate the option to purchase agreement with the property owner.
Orestone Mining Corp. is a Canadian based company that owns a 100 percent interest in the Captain gold - copper project in north central British Columbia. The project hosts a gold-copper porphyry system which encompasses a cluster of large targets see website for maps located 41 kilometres north of Fort St. James, B.C. and 30 kilometres south of the Mt. Milligan copper-gold mine. For more information please visit www.orestone.ca.
The Dexing porphyry coppergold deposit is one of the largest copper resources in China. While there has been discovery of larger CuMoAu deposits in the Tibetan region in the past decade such as the Tiegelongnan deposit Lin et al. 2017, Dexing is notable for the high copper grade gt1.
Porphyry Cu and porphyry Mo deposits are large to giant deposits ranging up to gt20 and 1.6 Gt of ore, respectively, that supply about 60 and 95 of the worlds copper and molybdenum, as well as significant amounts of gold and silver. These deposits form from hydrothermal systems that affect 10s to gt100 km3 of the upper crust and result in enormous mass redistribution and potential.
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.
Jul 07, 2020nbsp018332Golden BirchampCloseCurlyQuotes target commodities are copper and gold, which are the key metals contained in most of the porphyry deposits present along the New Guinea Fold Belt of Papua New Guinea. GBRX is exploring in big deposit elephantampCloseCurlyDoubleQuote country, home to numerous Tier-1 porphyry copper-gold deposits.
Analysis of 55 porphyry copper deposits demonstrates a continuum between porphyry copper-gold deposits emplaced at a median depth of 1 km, with a median sie of 160 million metric tons of copper.
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