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Topic: Porphyry (geology)

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	technical ceramics, marble, granite, travertine, stone, slate, quartzite, porphyry
		In geology this terms indicates a mass of molten and incandescent rock originating from the earth’s interior.
		Depending on the nature of the rock you may have granite porphyry made up of quartz, orthoclase and mica; quartz porphyry and syenitic porphyry.
		Main constituent of granite, of quartz porphyry, of gneiss or of trachyte.
	www.irisfmg.com /eng/glossary.asp (2777 words)

	Porphyry - Search Results - MSN Encarta
		Porphyry (Greek porphyros, “purple”), term originally applied to an Egyptian rock composed of prominent crystals of feldspar embedded in a red or...
		Porphyry is a variety of igneous rock consisting of large-grained crystals, such as feldspar or quartz, dispersed in a fine-grained feldspathic matrix or groundmass.
		Porphyry (Greek: purple-clad) may refer to: Porphyry (geology), a very hard red, green, or purple igneous rock Porphyry (philosopher) (c.
	encarta.msn.com /Porphyry.html (175 words)

	Geology Encyclopedia (Site not responding. Last check: )
		Geology (from Greek γη- (ge-, "the earth") and λογος (logos, "word", "reason")) is the science and study of the solid matter of the Earth, its composition, structure, physical properties, history and the processes that shape it.
		The word "geology" was first used by Jean-André Deluc in the year 1778 and introduced as a fixed term by Horace-Bénédict de Saussure in the year 1779.
		In geology, when an igneous intrusion cuts across a formation of sedimentary rock, it can be determined that the igneous intrusion is younger than the sedimentary rock.
	www.hallencyclopedia.com /topic/Geology.html (1720 words)

	Porphyry (geology) - guideofcasinos.com (Site not responding. Last check: )
		Porphyries may be aphanites or phanerites, that is, the groundmass may have invisibly small crystals, like basalt, or the individual crystals of the groundmass may be easily distinguished with the eye, as in granite.
		The porphyry portal of the "church house" at Colditz Castle, Saxony, designed by Andreas Walther II (1584), is a clear example of the exuberance of "Antwerp Mannerism".
		Porphyry was used extensively for decoration in the south eastern portions of Germany, Poland, and Czechoslovakia.
	www.guideofcasinos.com /Porphyry_(geology).html (656 words)

	Untitled Document
		1992 - 1994 Geology of the cordilleran belt from Quebrada Blanca and Chuquicamata with emphasisi on the structural evolution of the West Fault of Chuquicamata and related structures.
		Geology and geochemistry of the Colliguay gold district, Central Coastal Cordillera, Chile.
		Genesis of porphyry copper deposits in the Andes of northern Chile in relation to Tertiary magmatism and tectonic uplift: Fission track evidence.
	www.cec.uchile.cl /~vmaksaev/Curriculum1.htm (6403 words)

	Mindoro Resources Ltd. - Archangel - Mon Aug 20, 2007
		Geology and Mineralization: Geology consists of strongly altered volcanics intruded by andesitic and dacitic intrusives, and overlain by younger cover volcanics to the northwest.
		A cluster of gold-silver and porphyry copper-gold prospects has been outlined along a strong northeast structural trend of at least six kilometers, which is open to the northeast.
		The holes bottomed at 500 meters depth in the anhydrite-gypsum zone of the porphyry system, which is normally adjacent to the potassic mineralized core.
	www.mindoro.com /s/Archangel.asp (683 words)

	Adanac Moly - British Columbia Ministry of Energy, Mines and Petroleum Resources, Van, British Columbia
		The geology of the deposit is described by Sutherland Brown (1970), White et al.
		The shape of the fine-grained sill and the angular nature of the fragments in the plutonic-breccia in the zone of higher-grade mineralization are consistent with intrusion into previously deformed rock.
		The higher-grade zone appears to owe its existence to improved ground preparation on the east side of the sparse porphyry cupola and the introduction of the fine-grained quartz monzonite sill.
	www.adanacmoly.com /adanac_rubycim.php (2429 words)

	Cordilleran Mineral Deposits Video Library
		Au-Cu porphyry deposits are an important source of gold from the geology circling the Pacific, having 26 major deposits with more than 7,000 tons of gold.
		Bruce Nesbitt is a Professor from in the Department of Geology at the University of Alberta.
		Porphyry Cu-Au, mesothermal shear vein, breccia systems and a variety of epithermal systems are presented by eight major mineral deposits in the Iskut-Stikine.
	www.amproductions.com /videos/mining/cseries.html (2587 words)

	Exploring for Copper Deposits
		The porphyry deposits occur underground on the edges of intrusive igneous bodies known as stocks.
		In this model, the immediate sources of the metals are the rocks surrounding the igneous stock, the circulating groundwater is the transporting mechanism, and the cooling and changing composition of the groundwater is the precipitation mechanism.
		In the case of porphyry copper deposits, geologists know that such deposits usually form on the outer edges of the igneous stocks and within alteration zones.
	www.beloit.edu /~SEPM/Rocks_and_minerals/exploring_for_copper.html (2163 words)

	Emed Mining
		The low base metal and sulphur values recorded in the earlier holes indicate that the current drilling is peripheral to the inferred intrusive porphyry mineralisation source.
		The geology consists of a caldera-graben complex in the centre of a large stratovolcano, with widespread propylitic, silic and localised advanced argillic alteration indicating substantial high-level hydrothermal activity typically associated epithermal deposits and the upper levels of porphyry copper deposits in this district.
		This geological setting is considered analogous to of the Stiavnica-Hodrusa mineral field and is considered to be a classic geological setting for the formation of large porphyry and epithermal gold orebodies.
	emed-mining.com /site/index.php?option=content&task=view&id=125&Itemid=46 (819 words)

	EMX Acquires Treuil Copper Porphyry Project In Haiti
		The geology of the Treuil project consists of a north-south trending zone of quartz-diorite porphyry intrusions that are hosted in Cretaceous-aged andesitic volcanics and calcareous siltstone and mudstones.
		The Coupe Conte porphyry is located in the northern area of the property, and is 600 meters north-south by 150 meters east-west as currently defined.
		The Dacilia porphyry is located 2.2 kilometers to the south, and has dimensions of 400 meters north-south by 150 meters east-west.
	www.marketwire.com /mw/release.do?id=643639 (715 words)

	OF 2006-1259: References Cited
		Chiulli, A.T., 1987, The geology and stratigraphy of the northeast quarter of White Cross quadrangle, Orange County, North Carolina: Chapel Hill, University of North Carolina, unpub.
		Hauck, S.A., 1977, Geology and petrology of the northeast quarter of the Bynum quadrangle, Carolina slate belt, North Carolina: Chapel Hill, University of North Carolina, unpub.
		Perello, J.A., 1994, Geology, porphyry Cu-Au, and epithermal Cu-Au-Ag mineralization of the Tombulilato district, North Sulawesi, Indonesia: Journal of Geochemical Exploration, v.
	pubs.usgs.gov /of/2006/1259/ref_cited.html (3009 words)

	[No title]
		Barter, C.F., and Kelly, J.L., 1982, Geology of the Twin Buttes mineral deposit, Pima mining district, Pima County, Arizona, in Titley, S.R., ed., Advances in geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p.
		Bryant, D.G., and Metz, H.E., 1966, Geology and ore deposits of the Warren mining district, in Titley, S.R., and Hicks, C.L., eds., Geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p.
		Cummings, R.B., 1982, Geology of the Sacaton porphyry copper deposit, Pinal County, Arizona, in Titley, S.R., ed., Advances in geology of the porphyry copper deposits, southwestern North America: Tucson, University of Arizona Press, p.
	wrgis.wr.usgs.gov /open-file/of99-556/bib.doc (15380 words)

	Kitco Casey - Your Resource Stock Tools & Analysis
		Copper, molybdenum and gold in porphyry deposits are precipitated from hot fluids originating from molten rock at depths generally greater than five miles deep in the earth.
		The 1960s and ‘70s are thought of as the "porphyry boom", when exploration for copper was driven by high demand for the metal.
		Porphyry mines are large, open-pit operations and thus incur higher-than-average expenses for equipment and fuel.
	www.kitcocasey.com /xleague/xLeagueDispatch.php?id=15 (1745 words)

	World Mining News - Item [84624]: News Release
		The rock is herein referred to as silicified alaskite feldspar porphyry in Table 1 (also see Figure 2 for a typical example of alaskite porphyry as compared with the monzonite porphyry (Figure 3) that appears to host much of the Cu-Mo mineralization).
		The identification of a molybdenum enriched alaskite porphyry in drill hole YK02-B is similar to the deep molybdenum occurrences associated with the quartz latite and latite porphyry units at Bingham Canyon, Utah, thus adding considerable credibility to an assignment to the highly productive Bingham Type model(1) in the Magma-Metal series classification.
		The current copper-molybdenum-gold mineralization hosted in the monzonite porphyry unit is similar to that hosted in the quartz monzonite porphyry unit at Bingham Canyon (stage 3 in the Magma-Metal series classification).
	www.mbendi.co.za /a_sndmsg/news_view.asp?I=84624&PG=15 (797 words)

	Geology of the Cripple Creek Mining District
		Tephriphonolite occurs primarily as small stocks in the central part of the volcanic complex (historically referred to as Syenite).
		This unit occurs as equigranular porphyry with plagioclase and pyroxene as the primary phenocrysts.
		Klipfel, 1992, Proterozoic Geology and Massive Sulfide Mineralization of Northern Colorado: Paper presented at the twenty eighth annual Intermountain Minerals conference, August, 1992, Vail, Colorado.
	www.ccvgoldmining.com /Geology/geology.html (2072 words)

	Management Bios
		Godwin is Professor Emeritus at the University of British Columbia, where he taught the exploration and geology of mineral deposits from 1975 until he retired in 1999.
		During his tenure, he specialized in field and laboratory studies of porphyry, epithermal, kimberlite, skarn and volcanogenic mineral deposits.
		Godwin was a founding director of International Geosystems Ltd. and became involved in the development of the GEOLOG System, one of the first computer-based schemes for capturing and using data from exploration-development work, especially drill holes.
	www.argentexmining.com /management.asp (597 words)

	ESRI Map Book Volume 16: Geology - World Distribution of Porphyry, Porphyry-Associated Skarn, and Bulk-Tonnage ...
		This map, which depicts porphyry-related deposits, its underlying database, and the generalized geology of the world as a backdrop, is part of the World Map project.
		An AML script was also used for plotting the generalized geology coverage as a backdrop.
		AML routines prepared this coverage, which apply a set of age and specialized rock type queries to the full Generalized Geology of the World GIS database, attach corresponding generalized classifiers to a copy of the bedrock domain coverage, and dissolve all redundant arcs.
	www.esri.com /mapmuseum/mapbook_gallery/volume16/geology1.html (240 words)

	hillsboro (Site not responding. Last check: )
		The geology of the Hillsboro district is dominated by Cretaceous andesite flows (75.4±3.5 Ma, 40Ar/39Ar), breccias, and volcaniclastic rocks that were erupted from a volcano.
		The Twin Peaks monzonite porphyry in the Burro Mountains is 72.5 Ma (Hedlund, 1980) and a hornblende andesite in the Hidalgo Formation in the Little Hatchet Mountains is 71.4 Ma (Lawton et al., 1993).
		Porphyry copper deposits are not known to occur in these areas, but certainly the possibility exists that deposits may occur undiscovered in the subsurface.
	geoinfo.nmt.edu /staff/mclemore/abstracts/hillsboro.html (3717 words)

	[No title]
		In addition, the geology and controls on the hydrology are used to establish a framework for the water quality data.
		This complexity affects most drainages associated with Mo porphyry systems due to the proximal position of base metals, or, as is the case at Battle Mountain, later mineralization events that overprint the porphyry system.
		The higher D34SSO4 value in the drill hole sample supports the hypothesis that discharging water contacted the Mo porphyry deposits as well as the base metal (mass balance calculations using sulfur isotopes suggests that 70% of the sulfate sulfur is from the porphyry system and 30% from the base-metal deposits).
	pubs.usgs.gov /of/2002/of02-195/ChD.txt (3860 words)

	Personal Page of Assoc. Prof. Dr. Strashimirov S. B.
		Geology and prospecting of mineral resources, mineral composition and conditions of forming in ore deposits, fluid inclusion studies, development and zonality in ore deposits distribution, mineralogical problems in mineral processing.
		Porphyry copper mineralisations in the Central Srednogorie zone, Bulgaria.
		Geology and genetical model of the porhyry copper deposits from the Assarel-Medet ore field.
	www.clmc.bas.bg /MINSOC/Membership/S_Strashimirov/S_Strashimirov.htm (522 words)

	Mark_Barton_Group
		Theses have spanned economic geology to experimental petrology to isotope geochemistry to structural geology to mineralogy.
		Graf, Adam, 1997, Geology and porphyry-style mineralization of the Cerro de la Gloria stock associated with high-T carbonate-hosted Zn-Cu-Ag(-Pb) skarn mineralization, San Martin district, Zacatecas, Mexico: unpublished M.S. thesis, University of Arizona, 163 p.
		Leland, John, 1990, Geology and petrogenesis of the Melrose stock, Elko County, Nevada: unpublished M.S. thesis, University of California, Los Angeles, 134 p.
	www.geo.arizona.edu /~mdbarton/MDB_Group.html (1468 words)

	Stephen Rowins' Homepage
		I first became familiar with the geology of the property in 1996 whilst employed as a Project Geologist by Westmin Resources Limited, the majority owner of the property.
		Despite the widely held view that porphyry Cu-Au deposits are generated from highly oxidized ore fluids, several porphyry Cu-Au deposits that I studied in the 1990’s displayed compelling evidence of having formed from relatively reduced ore fluids, i.e., oxygen fugacity below the Quartz-Fayalite-Magnetite (QFM) oxygen buffer at the temperatures of mineralization.
		This was the first study to analyze B isotopes in hydrothermal tourmaline from porphyry Cu deposits and sedimentary rock-hosted Au ores.
	www.eos.ubc.ca /personal/rowins/researchprojects.html (1507 words)

	MRD - MIG : Fiji's Geology
		This boundary is well recognised as the locus of several major world-class porphyry coppergold and epithermal gold systems.
		These stages reflect the growth of Fiji as an island arc, its maturity and final arc breakup, with the early periods (up to 7 Ma) dominated by subduction-related geology, and geochemical signature changing to a later regime more related to extension, with relatively diminished amounts of subduction component.
		This plate boundary hosts major epithermal gold deposits and copper-gold porphyry systems in northern and eastern PNG at Lihir (Ladolam Deposit), Porgera, Ok Tedi and Misima, in the Solomon Islands, at Gold Ridge, and at Emperor and Mt Kasi in Fiji.
	www.mrd.gov.fj /gfiji/geology/educate/geo_fiji.html (2136 words)

	Monterrico Metals Plc - Rio Blanco - Geology - Mon Aug 20, 2007
		The Rio Blanco Porphyry Copper Project is located close to the frontier with Ecuador; it represents the northern extremity of the copper-gold belt of the northern Peruvian Sierras.
		The porphyry complex has a quartz porphyry core (exposed in Quebrada Majaz), which intruded an earlier feldspar porphyry complex.
		An extensive development of igneous breccia is present in the porphyry complex; it appears to have formed around the margins of the quartz porphyry, when it intruded.
	www.monterrico.co.uk /s/RioBlanco.asp?ReportID=76406 (970 words)

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