troctolitic and anorthositic types) and olivine-hypersthene gabbro, of presumed Devonian ... miles is exposed, containing concentrations of pentlandite-bearing pyr-rhotite. During 1932-35, while I was working in professor Larsen's Iaboratory at Harvard as a commonwealth Fund Fellow, r paid several

The size of the deposit is estimated to be large. Mine operations consist of surface workings extending 1,600.00 hectares (3,953.68 acres). There is one known shaft. The ore mined is composed of pentlandite, gold and pyrrhotite with waste material consisting primarily of …

troctolitic rocks occurs toward the bottom of the hole. Along the pro-file of Hole 895E, dunite prevails over harzburgite (i.e., the relative proportion of peridotitic rocks is opposite that found in Hole 895D). Typically, a gradational transition between the two rock types could be observed. In dunites, short troctolitic sequences occur all ...

Pentlandite Plumbopalladinite Valleriite Cubanite Comments: Polished Section image (PPL) of plumbopalladinite (Pl) with polarite Po), surrounded by a rim of isoferroplatinum (Iso) with cubanite (Cu), pentlandite (Pe), and valleriite (Va).

CU:NI=5.1:1. MOST OF ORE IS 2-3% SULFIDE, BUT IS LOCALLY MASSIVE. PT+PD VALUES RANGE FROM 100->2400 PPB OVER 10 FT INTERVALS. HIGH GRADE INTERSECTIONS IN FIVE DRILL HOLES RAN A MAXIMUM OF 5.64% CU, 0.64% NI, 2 PPM PT, 9.4 PPM PD, 9 PPB IR, 85 PPB RH, 20 PPB RU, 2.1 PPM AU, AND 15 PPM AG.

Pentlandite (Fe4.5Ni4.5S8.0), cobalt pentlandite (Co9S8) and the member of the solid solution with 50 mole % Co9S8 (Fe2.25Ni2.25Co4.50S8.00) are cubic, Fi (3) over barm, with a equal to 10.0608(2 ...

Ultramafic horizons are defined as the BT1-uz subunit and are olivine-rich troctolite. The very base of the BT1 is a heterogeneous sequence (BT1-c) that consists of noritic, gabbronoritic and troctolitic rocks, which hosts most of the disseminated base metal sulfides (pyrrhotite, chalcopyrite, cubanite and pentlandite).

The primary sulfide minerals in types 2 to 5 include pyrrhotite, chalcopyrite, cubanite, and pentlandite. Only types 2 and 5 are known to occur along the northern contact. Platinum-group minerals (PGMs) are only known to occur along the western margin of the Complex. ... The Duluth Complex is composed of troctolitic, gabbroic, and anorthositic ...

Ternary diagrams of pentlandite, chalcopyrite, and pyrrhotite proportions in gabbroic and troctolitic samples of the Middle Banded series Full size image The sulfide proportions column of Fig. 4 shows that pentlandite increases upwards from the base of PZ to ∼G-chromitite, paralleling the increase in Cl content of apatite.

The South Filson Creek mineralization occurs above the basal units of the South Kawishiwi intrusion and represents an uncommon geologic setting of Cu-Ni-platinum-group element (PGE) mineralization within the Duluth Complex.

The Mechanic Settlement pluton, southern New Brunswick, is a high-level mafic-ultramafic pluton of Late Neoproterozoic age (ca. 557 Ma). Based on surface outcrop and drill core samples, the pluton includes six different lithologic assemblages: peridotitic, olivine-bearing gabbroic, gabbroic, anorthositic, troctolitic, and dioritic, each of which consists of a range of related rock types.

dioritic, and troctolitic [Emslie et al., 1994]. Exam-ples of Mesoproterozoic troctolitic intrusions found in this area include the Kiglapait Intrusion, the Hettasch Intrusion and the Newwark Island Intru-sion (Figure 1). The Nain Plutonic Suite invades the Nain-Churchill suture zone. The Voisey's Bay Intrusion and the Mushuau Intrusion ...

troctolitic, gabbroic, noritic, and ultramafic rocks. This heterogeneity is a function of many factors, ... pentlandite. Pyrrhotite is generally the dominant sulfide, especially closer to the basal contact. Either chalcopyrite and/or cubanite are the dominant Cu-sulfide. Also present are minor

U.S.DepartmentoftheInterior BureauofLandManagement AlaskaStateOffice 222West7th,#13 Anchorage,Alaska99513 PlatinumandPalladiuminMafic-Ultramafic IgneousRocks,NorthwesternAlaska ThomasC.Mowatt JK 870.L3 06 no.37 c.2 ©(LH»^0a©tea@p>©roIPSO©K©p@orti87I November1991

Granite to diorite dikes cut all lithologies. Sulfide mineralization, consisting of pyrrhotite, pentlandite, chalcopyrite, and cubanite, is primarily disseminated in the troctolitic rocks within 1000 feet of the contact. Sulfide veins fill fractures and breccia zones in both …

Disseminated sulfides, ranging in concentration from 1 to 2 volume percent, occur throughout he troctolitic sequence but are in general concentrated near the basal contact with rocks of the metasedimentary ia Formation. Principal sulfide minerals are pyrrhotite, chalcopyrite, cubanite, and minor pentlandite.

Platinum-group minerals (PGM) in the Freetown Complex, Sierra Leone John F.W. Bowles1, Hazel M. Prichard2 and Peter C.Fisher2 1Mineral Science Ltd., 109 Asheridge Road, Chesham, England HP5 2PZ 2Department of Earth Sciences, University of Cardiff, PO Box 914, Cardiff, Wales CF10 3YE e-mail: [email protected] The Freetown Complex in Sierra Leone

The host troctolitic rocks are in contact with sulfide-bearing metasedimentary rocks of the ia Formation. The origin of the sulfide ... They are composed mainly of chalcopyrite and pentlandite, with lesser amounts of pyrrhotite and cubanite. They appear to have formed at high R factors

The Echo Lake intrusion in the Upper Peninsula (UP) of Michigan, USA, was formed during the 1.1 Ga Midcontinent Rift event in North America. Troctolite is the predominant rock unit in the intrusion, with interlayered bands of peridotite, mafic pegmatitic rock, olivine gabbro, magnetite-bearing gabbro, and anorthosite. Exploratory drilling has revealed a platinum group element (PGE)-enriched ...

The Water Hen intrusion is an oxide-bearing (ilmenite + magnetite) ultramafic intrusion (OUI) that is emplaced along a pre-basement fault into the troctolitic series rocks of the Duluth Complex. The intrusion consists of medium-grained dunite and peridotite and local pegmatitic pyroxenite approximately 1,600 ft. x 500 ft. x 700 ft. in size.

The mineralisation comprises pyrrhotite (both hexagonal and troilite in varying proportions), pentlandite, chalcopyrite, magnetite and minor cubanite. An important component of all mineralized zones is a breccia of gneissic fragments in a troctolitic to noritic matrix referred to as BBS or FB.

pentlandite (white), and silicate (phlogopite and pargasite, dark gray) in chronian spinel. Maximum dimension of loveringite grain is ca. 35 pm. Iom,rrF'IcATroN AND ANALyTTcAL METHoDS In reflected light, loveringite is opaque, with a grey tone and a pinkish hue similar to ilmenite, from which it is distinguished quite easily by its isotropism ...

Tisserlitine 001 21.325°N, 0.729°E. Gao, Mali. Find: 2019 Dec. Classification: Lunar meteorite (feldspathic breccia) History: Beginning in December 2019 many similar dark stones were found together in the Kidal region of Mali, close to the border with Algeria.One very large stone (40026 g), another stone (4037 g) and 44 smaller stones (combined weight 3642 g) (total weight 47705 g) were ...

Segregation of magmatic fluids and their potential in the mobilization of platinum-group elements in the South Kawishiwi Intrusion, Duluth Complex, Minnesota — Evidence from petrography, apatite geochemistry and coexisting fluid and melt inclusions

Pentlandite exsolutions in pyrrhotite have the same major-element chemistry as the coarse-grained variety, whereas pentlandite in irregular veinlets and disseminations among serpentinized silicates and secondary minerals is characterized by lower Ni (23–28 wt.% Ni) but the same elevated Co contents (Suppl. Table S1).

The troctolitic intrusions, including the Voisey's Bay Intrusion, were formed by primitive magma which rose directly from the mantle into the crust. ... chalcopyrite and pentlandite). Leucotroctolite contains less abundant augite oikocrysts than olivine gabbro, but is otherwise similar. Normal troctolite is medium-grained and consists of ...

The pentlandite is coarse grained and often forms coarse "loop textures" rimming large crystals of pyrrhotite. The pentlandite is frequently associated with magnetite, which is dispersed throughout the sulphide minerals. Magnetite can occur in local concentrations, ranging from less than 5 per cent to as high as 30 per cent.

Petrography: (A. Irving, UWS and P. Carpenter, WUSL) Breccia composed of mineral clasts of anorthite, olivine, augite and pigeonite, plus sparse lithic clasts of microcrystalline anorthosite with fine grained mafic phases, are set in a fine grained microvesicular matrix containing accessory altered kamacite, troilite and rare pentlandite ...

Geology and Mineralogy of NorthMet and the Duluth Complex. The NorthMet deposit is located in the Partridge River Intrusion of the Duluth Complex, a massive geological formation near the eastern end of the Mesabi Iron Range, which contains one of the world's largest known undeveloped accumulations of copper, nickel and platinum group metals.

Polymetallic deposit is known to be a disseminated sulphide deposit in heterogeneous troctolitic rocks and is associated with the Midcontinent Rift, which is believed to have formed more than one billion years ago. Four types of metallic minerals including chalcopyrite, cubanite, pentlandite and pyrrhotite are widely found at this deposit.

troctolitic, anorthositic troctolite and olivine gabbro lithological character – reinforcing the Voisey's Bay ... The relatively high cobalt values in the pentlandite are interpreted by Company geologists to indicate that the mineralization intersected was more 'evolved', and that more 'primitive', nickel-rich

The magmatic sulfide ore deposit Wetlegs is found within the troctolitic Partridge River Intrusion (PRI) of the 1.1 Ga Duluth Complex. It is of great interest, due to its highly mineralized zones containing Cu-Ni-Fe-Sulfides, platinum-group minerals (PGM) and arsenic-enriched ores. Sulfides appear as disseminated patches of primary pyrrhotite, chalcopyrite, Co-rich pentlandite and cubanite ...

The invention discloses a simple method for extracting pentlandite monominerals. The method is characterized in that copper-nickel sulphide ore is used as a raw material, and a magnetic field of which the strength gradually increases is applied to the copper-nickel sulphide ore through a permanent magnet, so as to achieve stage-by-stage magnetic separation of the copper-nickel sulphide ore.

Tisserlitine 001 21.325°N, 0.729°E. Gao, Mali. Find: 2019 Dec. Classification: Lunar meteorite (feldspathic breccia) History: Beginning in December 2019 many similar dark stones were found together in the Kidal region of Mali, close to the border with Algeria.One very large stone (40026 g), another stone (4037 g) and 44 smaller stones (combined weight 3642 g) (total weight 47705 g) were ...

The host troctolitic rocks are in contact with sulfide-bearing metasedimentary rocks of the ia Formation. The origin of the sulfide mineralization has generally been linked to contamination of the mafic magma through partial assimilation of the argillaceous country rocks. ... They are composed mainly of chalcopyrite and pentlandite, with ...