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Lode Gold Deposits

Emphasis on the ArcheanLode Gold Deposits

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Gold Deposits

1. Shallow environments Epithermal (HS, LS, ILS)

Submarine exhalative

Witwatersrand (?)

2. Moderately deep Porphyry

Carlin

Skarn

Manto

3. Deep environments

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Crustal Environments of GoldDeposits

Poulsen (1996)

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Gold Deposit Classes

Hagemann and Brown (2000), p. 2

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Gold Deposit Classes

Hagemann and Brown (2000) p.2

Hagemann and Brown (2000), p. 2

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Tectonic EnvironmentKerr ich (2000)

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Global Distribution-ArcheanHagemann and Cassidy (2000), p.11

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Grade and Tonnage

Poulsen et al. (2000)

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Grade and TonnageSalomon and Groves (2000)

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Grade and TonnageHangemann and Cassidy,2000- p.13

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Major Controls-Archean: Structural

Regional:

major tectonic breaks (1

st

order)

Local:

second- and third-order structures

fold-hinge

replacement

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ArcheanGold-

variousstyles

Salomon and Groves (2000)

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Regional Structural Controls-Superior Province

Poul sen (1996)

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Regional Structural Controls-AbitibiHangemann and Cassidy (2000)

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Regional structural controls-Val dOrRobert (1996)

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Local Control-2nd and 3rd

orderstructures

Sigma Mine

Robert (1996)

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Shear and Tension Veins- Beaufor

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Shear and Tension Veins- Beaufor

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Model for vein formationHodgson, 1989

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Hodgson, 1989

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Regional Structural controls-Australia

Salomon and Groves (2000)

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Regionalcontrol-Yilgarn

Block

Salomon and Groves (2000)

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Regionalstructuralcontrols

Kalgoorlie

Hagemann and Cassidy (2000)

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GoldenMile-

2nd and 3rd

orderstructures

Hagemann and Cassidy (2000)

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Golden Mile-section

Hagemann and Cassidy (2000)

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Gold iniron-

formation

Lupin Mine,Slave

Province

Kerswil l (1996)

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Slide Lupin ore

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Gold iniron-formation

Kerswil l (1996)

Cross-section through the

McLeod deposit,

Beardmore-

Geraldton, Ontario

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Gold iniron-

formation

Kerswil l (1996)

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Bousquet-Doyon type

Banded massive sulphide

Ore- LaRonde mine

High-grade gold-quartz vein,

Doyon deposit

Pousen et al ., 2000

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Hemlo

Poulsen (2000)

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Hemlo ore zone and alteration

Poulsen, 1996Golden Giant Mine-Plan

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Hemlo-alteration and ore

Poulsen et al., 2000

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Other

StructuralStyles

ex: PaleozoicMeguma terranebut similar to

Archean PamourMine

Robert, 1996

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Other Structural Styles

This example is a Paleozoic deposit, however the geometry

of the veins is similar to Pamour Mine, which is Archean.

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Archean Gold-Host RocksSalomon and Groves (2000)

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ArcheanGold-

variousstyles

Salomon and Groves

(2000)

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Gold Deposits

They are various styles of ArcheanDeposits:1. Disseminated

2. Different styles of veins

3. Different ages4. Different alterations

They are hosted in different rock types:

1. Volcanic rocks (mafic and felsic)2. Plutonic rocks (mafic and felsic)

3. Iron-formation and VMS

4. Turbidite

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Next:Alteration

andGenetic Model