scholarly journals Laboratory tests of nickel-copper ore from Admiralty-Alaska Mining Corporation, Alaska

10.14509/902 ◽  
1956 ◽  
Author(s):  
Keyword(s):  
Laboratory Tests ◽  
Copper Ore ◽  
Nickel Copper

scholarly journals The Comparison of Main Copper Sulphide Minerals Beneficiation Under Laboratory and Industrial Conditions at the KGHM Concentration Plant

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Paweł KURZYDŁO ◽  
Witold PAWLOS
Keyword(s):  
Laboratory Tests ◽  
Geological Structure ◽  
Copper Sulphide ◽  
Copper Ore ◽  
Ore Deposit ◽  
Sulphide Minerals ◽  
Concentration Plant ◽  
Complex Geological Structure ◽  
Process Line

The Zechstein copper ore deposit located on the Foresudetic monocline has a complex geological structure both in lithological and mineralogical aspects. The significant variability in quantity and quality of minerals deposited in the ore bed is one of the factors determining the susceptibility of copper ore to beneficiation based on flotation, which is carried out in the KGHM Concentration Plant. Based on the algorithm developed, flotation experiments on a laboratory scale have been conducted to predict the upgrade rates under industrial conditions. This paper provides the results of the mineralogical examination of the flotation products performed by one of the KGHM Concentration process lines and compares the beneficiation of various copper sulphide minerals. The results of the laboratory tests have been compared with the results of sampling carried out simultaneously at the process line. A procedure has been proposed to develop equations defining the industrial upgradability curves for copper sulphide minerals under the KGHM Concentration Plant conditions.

Ancient Metallurgy in the Atacama: Evidence for Copper Smelting during Chile's Early Ceramic Period

1996 ◽  
Vol 7 (2) ◽  
pp. 101-113 ◽  
Author(s):  
Gray Graffam ◽  
Mario Rivera ◽  
Alvaro Carevič
Keyword(s):  
Laboratory Tests ◽  
Atacama Desert ◽  
Metallurgical Slag ◽  
Copper Smelting ◽  
Northern Chile ◽  
Copper Ore ◽  
Ancient Metallurgy ◽  
Slag Copper ◽  
Early Ceramic ◽  
Valuable Role

AbstractInvestigations at the Ramaditas site (Guatacondo Valley, northern Chile) were successful in the discovery of small quantities of ancient metallurgical slag, copper ore, and metal from sealed archaeological contexts dating to the first centuries B. C., and in the discovery of adjacent off-site furnace ruins that appear to be contemporaneous. Laboratory tests are positive in identifying both the surface and subsurface slag as a copper smelting by-product. These results are significant in that they demonstrate that copper smelting and metal manufacture were taking place in the Atacama in antiquity, constituting the first conclusive proof of what many Chilean scholars have anticipated since the early 1970s. These results support the view that the mining of minerals and the winning of metals played a valuable role in the economy of the first sedentary villages of interior Chile, in the foothills and valleys that rim the Atacama desert.

scholarly journals Evaluation of Rock Bolt Support for Polish Hard Rock Mines

2018 ◽  
Vol 35 ◽  
pp. 01006 ◽  
Author(s):  
Krzysztof Skrzypkowski
Keyword(s):  
Laboratory Tests ◽  
Underground Mining ◽  
Rock Bolt ◽  
Test Facility ◽  
Hard Coal ◽  
External Diameter ◽  
Copper Ore ◽  
Hard Coal Mining ◽  
Rock Bolt Support ◽  
Bolt Support

The article presents different types of rock bolt support used in Polish ore mining. Individual point resin and expansion rock bolt support were characterized. The roof classes for zinc and lead and copper ore mines were presented. Furthermore, in the article laboratory tests of point resin rock bolt support in a geometric scale of 1:1 with minimal fixing length of 0.6 m were made. Static testing of point resin rock bolt support were carried out on a laboratory test facility of Department of Underground Mining which simulate mine conditions for Polish ore and hard coal mining. Laboratory tests of point resin bolts were carried out, especially for the ZGH Bolesław, zinc and lead “Olkusz – Pomorzany” mine. The primary aim of the research was to check whether at the anchoring point length of 0.6 m by means of one and a half resin cartridge, the type bolt “Olkusz – 20A” is able to overcome the load.The second purpose of the study was to obtain load – displacement characteristic with determination of the elastic and plastic range of the bolt. For the best simulation of mine conditions the station steel cylinders with an external diameter of 0.1 m and a length of 0.6 m with a core of rock from the roof of the underground excavations were used.

scholarly journals Geology and crystallization conditions of the Särkiniemiintrusion and related nickel-copper ore, central Finland – implications for depth of emplacement of 1.88 Ga nickel-bearing intrusions

2020 ◽  
Vol 92 (2) ◽  
pp. 111-130
Author(s):  
Hannu V. Makkonen ◽  
◽  
Pekka Tuisku ◽  
Keyword(s):  
Nickel Sulfide ◽  
Nickel Content ◽  
Crustal Contamination ◽  
Granulite Facies ◽  
Metamorphic Grade ◽  
Contact Aureole ◽  
Critical Factors ◽  
Copper Ore ◽  
Nickel Copper ◽  
Crystallization Conditions

Several Ni-Cu deposits occur within the Kotalahti area, central Finland, in proximity to an Archaean gneiss dome surrounded by a Palaeoproterozoic craton-margin supracrustal sequence comprising quartzites, limestones, calc-silicate rocks, black schists and banded diopside amphibolites. The geology of the area and age of the Ni-bearing intrusions (1.88 Ga) are similar to the Thompson Ni belt in the Canadian Trans-Hudson Orogen. The small mafic-ultramafic and Ni-Cu -bearing Särkiniemi intrusion, closely associated with the Archaean basement core of the Kotalahti Dome, is composed of a western peridotite and eastern gabbro body, both of which are mineralized. The eastern gabbro has a contact aureole several meters thick, consisting of orthopyroxene +/- cordierite bearing hornfels between the intrusion and the migmatites. Geochemically, the Särkiniemi intrusion shares many features in common with other Svecofennian mafic-ultramafic intrusions, including crustal contamination and nickel depletion. The related Ni-Cu deposit has a low Ni/Co value (15) and low nickel content in the sulphide fraction (2.8 wt.%), together with a low estimated magma/sulphide ratio of around 170. Svecofennian 1.88 Ga mafic-ultramafic intrusions occur in terrains of variable metamorphic grade (from low-amphibolite to granulite facies) and are likely to represent emplacement at different crustal depths. Multi-equilibrium thermobarometry indicates that the contact aureole at Särkiniemi reached equilibrium at pressures of 4.5–6 kbar (15–20 km depth) and temperatures of 600–670 °C. Combined with the results of earlier research on the Svecofennian intrusions, this study indicates that a depth of 15–20 km crustal level was favourable, along with other critical factors, for nickel sulfide deposition at 1.88 Ga.

Critical limb ischaemia in diabetes: definition, assessment, prognosis

VASA ◽  
2001 ◽  
Vol 30 (Supplement 58) ◽  
pp. 21-27
Author(s):  
Luther
Keyword(s):  
Diabetic Foot ◽  
Laboratory Tests ◽  
Critical Limb Ischaemia ◽  
Limb Ischaemia ◽  
Clinical Use ◽  
Arterial Reconstruction ◽  
Arterial Circulation ◽  
Diabetic Foot Disease ◽  
Foot Disease ◽  
Fontaine Classification

In diabetic foot disease, critical limb ischaemia (CLI) cannot be precisely described using established definitions. For clinical use, the Fontaine classification complemented with any objective verification of a reduced arterial circulation is sufficient for decision making. For scientific purposes, objective measurement criteria should be reported. Assessment of CLI should rely on the physical examination of the limb arteries, complemented by laboratory tests like the shape of the PVR curve at ankle or toe levels, and arteriography. The prognosis of CLI in diabetic foot disease depends on the success of arterial reconstruction. The best prognosis for the patients is with a preserved limb. Reconstructive surgery is the best choice for the majority of patients.

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