Indicator Mineral Methods in Mineral Exploration. Harvey Thorleifson Minnesota Geological Survey
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1 Indicator Mineral Methods in Mineral Exploration Harvey Thorleifson Minnesota Geological Survey
2 Mineral exploration Direct inspection Remote detection
3 Remote detection Exploration geophysics Exploration geochemistry Indicator mineral methods
4 Remote detection Exploration geophysics Exploration geochemistry Chemical signal Indicator mineral methods
5 Remote detection Exploration geophysics Exploration geochemistry Chemical signal Indicator mineral methods Clastic signal
6 Chemical signal Transported by aqueous &/or gaseous processes Detected in media such as A horizon, B horizon, vegetation, or gases
7 Clastic signal Transported by mechanical processes Detected by sampling clastic sediments that have undergone minimal modification
8 Clastic sediments
9 Ideally: Indicator minerals Coarse-grained Specific to exploration target Visually distinctive Readily recovered Adequately abundant Adequately resistant
10 Indicator mineral methods Drift prospecting Drift exploration Tracing float Boulder tracing Stream sediment geochemistry Loaming Overburden sampling Till geochemistry Indicator mineral tracing
11 Indicator mineral surveys Exploration, mapping, research Regional reconnaissance Follow-up Assessment of geophysical targets In situ mineral chemistry
12 Objective Region or target Commodity or commodities
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14 Media Stream sediments Shoreline sediments Glaciofluvial sediments Till
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18 Spacing & layout Can vary by orders of magnitude 10 s s of km 1 km 0.1 km Layout Grid Transect
19 Ribbon shaped train: one direction (McClenaghan et al.,. 2001) Ranch Lake, NWT, pyrope grains in till
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22 All Indicators (J. Armstrong, 2003)
23 (Kong et al., 1999) James Bay Lowland Stream sediments derived from till DE BEERS
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25 Size Samples on the order of 10 litres Expected frequency ~ 1 indicator mineral per litre of sand May require 5 to 50 litres of sand % sand varies
26 Collection Road access, aircraft Exposures, shovel, excavator Large volume & weight Field concentration e.g. panning Field screening e.g. remove gravel
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29 Boulders Striations Field observations
30 Processing Disaggregate Screen gravel >2 mm (10 mesh) >1 mm (20 mesh) >4 mm (5 mesh) Retain gravel for lithology
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37 Density Pre-concentration Jig, table, pan, spiral, wheel Heavy liquid Size medium to very coarse sand Magnetism Reject non- paramagnetic
38 Heavy liquids Concentration Methylene iodide (MI, 3.3) Diluted MI (e.g. 3.2) Tetrabromoethane (TBE, 2.96) NaPolyW (variable) Superpanner DMS Magstream
39 Separator Hand magnet Ferromagnetics
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41 Classification Processing of nonferromagnetics Reduce picking time Add information Sizing E.g mm; mm Magnetic susceptibility Magstream
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43 Background Many aspects of processing are governed by regional heavy mineral background
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45 Picking/panning Identification of possible & probable indicator minerals Recovery Morphology Spikes Re-picks
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47 Gold grains Number Morphology Mass Composition
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53 Sulphides Rare coated grains in aerated sediments Fresh sulphides in sediments obtained by drilling
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58 Scheelite Lamping under short-wave ultraviolet
59 Base metal indicators e.g. resistates such as gahnite
60 Kimberlite indicator Cr-pyrope Mg-ilmenite Cr-spinel E-garnet Cr-diopside Olivine Diamond minerals
61 Morphology
62 Mineral chemistry Mount & polish grains Semi-quantitative analysis Quantitative major element analysis Mineral classification Trace element analysis
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74 25 30 Pressure (kbar, N&T2000) Gph Dia mw/m Temperature ( C, N&T2000) Mineral Services
75 Interpretation & follow-up
76 Indicator mineral surveys Objective Media Spacing Size Collection Processing Pre- concentration Concentration Ferromagnetics Classification Picking Morphology Mineral chemistry Interpretation & follow-up
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80 Minnesota indicator mineral survey
81 Minnesota indicator mineral survey
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84 Minnesota indicator mineral survey
85 Minnesota indicator mineral survey
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128 All Indicators (J. Armstrong, 2003)
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141 Indicator Mineral Methods in Mineral Exploration Harvey Thorleifson Minnesota Geological Survey
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