Concentration tests on ore and diamond drill core from Hull Iron Mines Limited, Hull, Quebec

The Goulding–Keene pegmatite consists essentially of albite, nepheline, and biotite with minor amounts of microline and other minerals. It is enclosed by plagioclase–nepheline–biotite–hastingsite–calcite gneisses and is apparently intrusive into these gneisses since it cuts the foliation of the gneisses, has some sharp contacts, and is not itself foliated. The gneisses and the pegmatite were sampled by more than 240 m of diamond drill core. Rock and mineral analyses show that the present composition of the pegmatite is very unlikely to be an igneous composition, and therefore that metasomatism has changed the original composition after emplacement of the pegmatite as a melt. This is consistent with textures observed in the gneisses and pegmatite.

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Application of micro-XRF to characterise diamond drill-core from lithium-caesium-tantalum pegmatites

ASEG Extended Abstracts ◽

10.1080/22020586.2019.12073139 ◽

2019 ◽

Vol 2019 (1) ◽

pp. 1-4

Author(s):

Naomi Potter ◽

Nigel Brand

Keyword(s):

Drill Core ◽

Diamond Drill

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The Davis nepheline pegmatite and associated nepheline gneisses near Bancroft, Ontario

Canadian Journal of Earth Sciences ◽

10.1139/e76-027 ◽

1976 ◽

Vol 13 (2) ◽

pp. 249-265 ◽

Cited By ~ 6

Author(s):

G. C. Sylvester ◽

G. M. Anderson

Keyword(s):

Direct Result ◽

Drill Core ◽

Diamond Drill

The Davis pegmatite consists largely of albite with some nepheline and biotite, and minor amounts of microline and several other minerals. It is discordant to a series of gneissic nepheline-amphibolites and plagioclase–nepheline–biotite–hastingsite–calcite gneisses. These rocks have been sampled by about 150 m of diamond drill core. Analyses of this material are interpreted to mean that the present composition of the pegmatite cannot be the direct result of magmatic crystallization. It is suggested that post-magmatic metasomatism has exchanged Na for K and Fe for Mg, among other changes, and this is consistent with the mineral textures observed.

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A METHOD FOR MEASURING THE ELECTRICAL CONDUCTIVITY OF DIAMOND DRILL CORE SPECIMENS

Geophysics ◽

10.1190/1.1437897 ◽

1953 ◽

Vol 18 (2) ◽

pp. 434-447 ◽

Cited By ~ 7

Author(s):

S. H. Ward

Keyword(s):

Electrical Conductivity ◽

Physical Properties ◽

Inductive Method ◽

Drill Core ◽

Diamond Drill ◽

Spherical Core

Conductive methods of measuring electrical conductivity are unsatisfactory for testing diamond drill core specimens of metallic ores. An inductive method which avoids many of the inherent difficulties of the conductive methods is described. The method consists of measuring the change of impedance of solenoid when a core specimen is inserted in it. A correlation between the change of impedance of the solenoid and the physical properties and dimensions of a spherical core is achieved mathematically. This result is extended, empirically, to include cylindrical cores. A convenient way to make the required measurements is outlined, followed by a description of the design of a particular inductive conductivity meter. Sample results obtained with this instrument are presented, and one application of the method is mentioned.

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