Multiple papers have been published defending either side of the argument, but this specific paper does not address which model is more correct. Gold mineralization is found in silicified quartz breccia zones throughout the property, in a country rock of precambrian gneiss. Most of the drilling and surface trenching described below has been in the area of the best surface exposures of mineralization, around the red cloud shaft. Structural control of the sizhuang worldclass epizonal. Primary control on mineralization is flatlying regional detachment fault mineralization hosted within hangingwall of fault and controlled by distribution of tectonic breccia gold mineralization hosted in fracturefill, hydrothermal breccias, and disseminated with sulphides liska zone previously drilled for pbzn by yugoslav. Epithermal deposits that are significantly younger than detachment faulting but are controlled by detachmentfault structures no known examples in the published literature. The author uses the proportions of adularia, quartz and electrum, the fineness of electrum, and the relative distance to the detachment fault to conclude that the first style of bladed texture has been formed at higher temperature relative to the second style. Ore petrology and geochemistry of the morning star deposit, california by ronald wynn sheets, virginia polytechnic. The most impressive result of this analysis is that all three lithotectonic associations have average gold grades that could be profitably exploited under current market conditions. Many prospectors will notice a relationship between faults and mineralization. Geology and mineralization of the whipple mountains. Letter report, geology and ore deposits of the great basin. A teritaryaged detachment zone is the dominant structure in the gold basin district of northwestern.
A major detachment fault, known as the snowshoe fault, trends across the property and onto the adjoining skylark property. While jemmett is not very enthusiastic about the mineral possibilities of the district, his report predates the discovery of the detachment fault model of gold mineralization. Initial andor renewed contact and conversations with the. Preliminary descriptive deposit model for detachmentfaultrelated mineralization. The age of mineralization and association with the detachment fault suggest that gold mineralization at ada tepe is more closely linked to the kessebir metamorphic core complex rather than to. Epithermal goldsilvermercury deposits at paradise peak. The timing of gold mineralization at the sizhuang gold deposit is likely to be between 126 and 115 ma, while the laicpms laser ablation inductively coupled plasma mass spectrometry zircon upb age 2 123 ma of the guojialing granodiorites defines the. Gold mineralization in the linglong mcc evolved from east ma to west 120 ma. Pdf structural and fluidflow evolution at the fosterville gold deposit in central victoria was influenced by three distinct stress regimes that. Investigation of mineralization related to detachment faulting. Sixteen common types of bedrock gold deposits are distinguished from one another and their main geological attributes are. It was also apparently intersected in the two ironwood drill holes further to the northeast although only silver grades were reported. Mineralization is predominantly controlled by the northwest trending shallow angle copperstone fault and shear zone.
Contact us for process engineering, metallurgical investigations. Epithermal goldsilver deposits that occur along or near lowangle faults. Two millennia of mining history in salsigne, near carcassonne in france, has recently led to a profitable gold mining operation. The author infers that the first style is promising for mineralization of higher grade.
Not all hard rock mineralization is associated with faults of course, but its no accident that a good number are. Geological society of america abstracts with programs, v. Fergusson island, png the fergusson island project is owned by crater gold mining limited incorporates the gameta and wapolu gold deposits which are approximately 30 kilometres apart and lie a short distance inland from the northern coastline of fergusson island in the dentrecasteaux island group of milne bay province, papua new guinea. Geologists define a fault as a break in the earths crust along which movement has occurred. Schematic crosssection of the moon mountain detachment fault and the copperstone listric fault depth unknown, solid heavy lines are observed faults. The gersdorffitebismuthinitenative gold association and. John kernp and don hairsine prospected many workings and outcrops on and off. Ester basin gold is in the upper plate of the buckskin rawhide detachment fault. Mineral exploration in the detachment fault environment of southwestern north america was originally oriented toward base metals, but is currently focused on gold. Map showing areas reported to contain gold mineralization in the general area of the black. A large detachment fault strikes in a nwse direction and the golden pearl veins are situated on high angle silicified faults that strike eastward and can be traced for over 4 miles. Fifth level gold exploration in serbia medgold resources. Other sedimentary rockhosted gold deposits surrounding this fold are the bannian, yangyuo, begao, and luodong.
Lowangle faults detachmentstyle are an important control on gold mineralization. Mineralization associated with syn to late kinematic auriferous quartz veins on ramps that initiate fault slip. The copperstone deposit is a midtertiary, detachment fault related gold deposit. Two mineralized zones occur in cambrian sedimentary rocks and are. We have all the laboratory and plant equipment you need to test or buildoperate your plant. Gold mineralization in the okanagan valley, southern. We have a metallurgical test for every possible mineral type and treatment. A working model for the origin of the copperstonedepositis asfollows. It has been interpreted as an uplifted metamorphic core complex where unmetamorphosed and unfolded cambrian strata are in detachmentfault contact with underlying deformed granitoids and precambrian metamorphic rocks of the core complex. Geology of the bullard mineral district the bullard fault in the bullard mineral district is an exposed segment of the regional detachment fault associated with the harcuvar metamorphic core complex reynolds and spencer, 1985. The project consists of 41 unpatented lode claims 910 acres located on blm land with no underlying royalties.
Epithermal deposits that overprint detachmentfaultrelated mineralization or that were emplaced during detachment faulting for example, bullfrog, nevada. A small part of goethite is transformed into hematite proved by xray powder diffraction observed only microscopically as dispersed grains sized few micrometers and. Contact information mining records curator arizona. The ores are zones of intensive silicification and brecciation synchronous with detachment faulting. Muehlenbachs department of geology, university of alberta, edmonton, alberta, canada t6g 2e3 abstract two styles of precious metal vein mineralization, epithermal and mesothermal, occur in. The structural controls of gold mineralisation within the bardoc tectonic zone, eastern goldfields province, western australia.
The lannigou deposit, the largest sedimentary rockhosted gold orebody shown on figs. Mineral ridge is an anticlinal dome found on the eastern flank of the silver peak range. Gold auriferous deposits can be classified into types for which here is a list of 10 types of gold deposits. Pdf role of faults and folding in controlling gold mineralisation at. The structural controls of gold mineralisation within the. Two mineralized zones occur in cambrian sedimentary rocks and are typical.
At the picacho mine of southeastern california figure 7, a lowangle normal fault chocolate mountains detachment has created extensive breccia zones with bounding lowpermeability rocks. Geodiversity of hydrothermal processes along the mid. Within the bullard mineral district, the bullard fault dips moderately to the southeast and has a fairly linear trace. Brittle deformation opened spaces in which bands of opaline.
Ely golds olympic gold mine project is located approximately 30 kilometers south of gabbs in the cedar mountains, mineral county, nevada. Relations along miocene detachment fault in general area of cyclopic mine. An episode of detachment faulting affected the paradise peak district and environs after steep. Arizona bureau of geology and mineral technology ieldnote. Mineralization is typically located along a 3 m to 8 m thick rubble zone or mylonite of a detachment or thrust fault that intersects high angle structures, either faults or folds. The jacksonlawtonbowman normal fault system and its relationship to carlintype gold mineralization. Lowangle faults detachment style are an important control on gold mineralization. This style of mineralization is present in the katherine gold district located approximately 15 km to northwest of the secret pass gold project. Gold has a bimodal distribution in lowtemperature znrich and in hightemperature curich mineral assemblages. Geology and gold mineralization of the gold basinlost basin. Gold deposition at xiadian occurred at 1 ma near the brittleductile transition along the detachment fault.
Gold mineralization in the adjacent cyclopic open pit and fry mine is hosted in a similar setting above the detachment fault. The asimotrypes gold mineralization has a tectonic and structural setting in common with mineralization genetically associated with extensional structures. Gold mine adventures the best place to find gold is. Regional structural control on the distribution of world. Then, in the late 1980s to the early 2000s, mineralized fault zones of. Detachmentfaultrelatedmineralization is high in copper and lead values. The mineralization and brecciation observed in the unit is related to the copperstone detachment fault. Copper and gold mineralization was first reported in the sacramento mountains of south.
Two different hydrothermal mineral assemblages are structurally localized in the detachment environment. The age of mineralization and association with the detachment fault suggest that gold mineralization at ada tepe is. The mccs occurred in an extensional regime caused by the rollback of the paleopacific plate. Syntectonic d2 fluid flow and gold mineralization along the basal, low angle, detachment of the kagera supergroup. The term picacho peak type gold was coined by ruiz 1986 to describe structurally controlled lode gold with associated disseminated gold. Thermochronologic constraints on evolution of the linglong. Similar mineralization is found 260 m northeast of gold chief along the stampede detachment fault at the soa mine. The mockingbird mineral trend involves an important new type of arizona gold deposit, called a detachment fault deposit. Faults and mineralization archive amds adventure forum.
Detachment fault deposits were first recognized as a separate form of gold. These structures are not confined to any lithologic unit, although the majority of the mineralization is hosted in quartz latite porphyry. The gold is commonly associated with only very small amounts of silver. Pdf geologic and geochemical study of the picacho gold. Geologists and miners missed the mockingbird mineral trend, a major gold deposit.
Structural controls of fluid flow and gold mineralization. Ruby hill normal fault cuts and offsets midcretaceous mineralization and is in turn cut and. Gold mineralization in the okanagan valley, southern british columbia. Conditions of gold mineralization in the detachment fault. The second model is a lowangle detachment fault setting, with gold deposition occurring at an oxidationreduction boundary. The porphyry gold mineralization possesses a markedly contrasting lithogeochemical signature, defined by high mo and very low ag, which resembles that displayed by the geologically similar porphyry gold deposits in the maricunga belt, northern chile. Stream sediment geochemical exploration for gold in the. The geological and historical perspectives are outlined and the methods used for extraction described.