Base Metal Distribution in Granitic Rocks; data from the Rocky Hill and Lights Creek Stocks, California

1972 ◽  
Vol 67 (4) ◽  
pp. 511-527 ◽  
Author(s):  
George W. Putman
Keyword(s):  
Base Metal ◽  
Metal Distribution ◽  
Granitic Rocks

scholarly journals Using soil geochemistry to investigate gold and base metal distribution and dispersal in the glaciated north of Ireland

Unearthed ◽  
2016 ◽  
pp. 89-100
Author(s):  
Michael Dempster ◽  
Mark Cooper ◽  
Paul Dunlop ◽  
Andreas Scheib
Keyword(s):  
Base Metal ◽  
Metal Distribution ◽  
Soil Geochemistry

The Paleoproterozoic Kristineberg mining area, northern Sweden: Results from integrated 3D geophysical and geologic modeling, and implications for targeting ore deposits

Geophysics ◽  
2009 ◽  
Vol 74 (1) ◽  
pp. B9-B22 ◽  
Author(s):  
Alireza Malehmir ◽  
Hans Thunehed ◽  
Ari Tryggvason
Keyword(s):  
Base Metal ◽  
Volcanic Rocks ◽  
Mining Area ◽  
Gold Deposits ◽  
Ore Deposits ◽  
Granitic Rocks ◽  
Gravity Modeling ◽  
Northern Sweden ◽  
Seismic Profiles ◽  
Geologic Model

The Kristineberg mining area in the western part of the Paleoproterozoic Skellefte Ore District, northern Sweden, is well known for its base-metal and recent gold discoveries. A pilot 3D geologic model has been constructed on a crustal scale, covering an area of [Formula: see text] to depths of [Formula: see text]. Constrained 3D inverse and forward gravity modeling have been performed to confirm and refine previous modeling along seismic profiles using mainly 2.5D techniques. The 3D inverse gravity modeling was geared to generating isodensity surfaces that enclose regions within the model of anomalous density contrast. The 3D forward gravity modeling was conducted to include faulting and folding systems that are difficult to include in the inversion. The 3D geologic model supports many previous interpretations but also reveals new features of the regional geology that are important for future targeting of base-metal and gold deposits. The margins of a thick granite in the south dip steeply inward, suggesting the possibility of room to accommodate another large base-metal deposit if the granitic rocks are juxtaposed with volcanic rocks at depth. Gravity modeling also suggests the observed Bouguer gravity high within the western metasediments can be explained by a large mafic intrusion that has dioritic to tonalitic composition and no significant magnetic signature. Because mafic-ultramafic intrusions within metasediments can indicate gold, this interpretation suggests the western metasediments have a high gold potential.

The effect of metamorphism on metal distribution near base metal deposits

1959 ◽  
Vol 54 (5) ◽  
pp. 919-943 ◽  
Author(s):  
Hubert Lloyd Barnes
Keyword(s):  
Base Metal ◽  
Metal Distribution

Sheet silicates as effective carriers of heavy metals in the ophiolitic mine area of Vigonzano (northern Italy)

2001 ◽  
Vol 65 (1) ◽  
pp. 121-132 ◽  
Author(s):  
E. Dinelli ◽  
F. Tateo
Keyword(s):  
Base Metal ◽  
Clay Fraction ◽  
Stream Sediments ◽  
Northern Italy ◽  
Waste Material ◽  
Metal Distribution ◽  
Effective Control ◽  
Material Surface ◽  
Mine Area ◽  
Sheet Silicates

AbstractIn order to assess the role played by sheet silicates in controlling base metal distribution, the mineralogy of the <2 µm fraction of waste material, surface soils, and stream sediments was investigated in the surroundings of a pyrite-chalcopyrite mine area in northern Italy. The results indicate that smectite is very abundant in the <2 µm fraction of the tailings, and it exerts an effective control on the concentrations of Zn, Ni (and Cu). Normal soils and sediments are characterized by interstratified illite-smectite and by lower base metal concentrations. Away from the mine area, smectite decreases in the stream sediments, and chlorite becomes more important in controlling base metal distribution.Ni, Cr, Cu and Co increase with chlorite and talc, but are depleted in the <2 µm fraction compared to coarser fractions in the stream sediments, because the sand–silt fraction of sediments concentrates ophiolitic fragments, variably enriched in ores. A mechanical dispersion of chlorite is probably the controlling factor. Zinc displays a systematic enrichment in the clay fraction of waste material and in the stream sediments but the main mineral carrier is not identified.

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