The University of Southampton
University of Southampton Institutional Repository

Gold in Irish coal: Palaeo-concentration from metalliferous groundwaters

Gold in Irish coal: Palaeo-concentration from metalliferous groundwaters
Gold in Irish coal: Palaeo-concentration from metalliferous groundwaters
Gold grains, up to 40 microns in size and containing variable percentages of admixed platinum, have been identified in coals from the Leinster Coalfield, Castlecomer, SE Ireland, for the first time. Gold mineralisation occurs in sideritic nodules in coals and in association with pyrite and anomalous selenium content. Mineralisation here may have reflected very high heat flow in foreland basins north of the emerging Variscan orogenic front, responsible for gold occurrence in the South Wales Coalfield. At Castlecomer, gold(-platinum) is attributed to precipitation with replacive pyrite and selenium from groundwaters at redox interfaces, such as siderite nodules. Pyrite in the cores of the nodules indicates fluid ingress. The underlying Caledonian basement bedrock is mineralised by gold, and thus likely provided a source for gold. The combination of the gold occurrences in coal in Castlecomer and in South Wales, proximal to the Variscan orogenic front, suggests that these coals along the front could comprise an exploration target for low-temperature concentrations of precious metals.
Coal, Gold, Groundwater, Ireland, Platinum, Pyrite, Siderite, Variscan orogeny
2075-163X
635-650
Bullock, Liam
c6ffb9b0-0a54-4ab2-9edb-f97280e6ce2d
Parnell, John
b86302b0-b930-4b7c-9786-13abc612fef7
Armstrong, Joseph G.T.
e787408b-d6cd-4355-963e-8590a0ce11db
Perez, Magali
496b62b9-ca3a-4b78-aaf7-4d14627f5771
Spinks, Sam
fd96ed0f-8b9a-4b76-ab98-2c2897c3da5d
Bullock, Liam
c6ffb9b0-0a54-4ab2-9edb-f97280e6ce2d
Parnell, John
b86302b0-b930-4b7c-9786-13abc612fef7
Armstrong, Joseph G.T.
e787408b-d6cd-4355-963e-8590a0ce11db
Perez, Magali
496b62b9-ca3a-4b78-aaf7-4d14627f5771
Spinks, Sam
fd96ed0f-8b9a-4b76-ab98-2c2897c3da5d

Bullock, Liam, Parnell, John, Armstrong, Joseph G.T., Perez, Magali and Spinks, Sam (2020) Gold in Irish coal: Palaeo-concentration from metalliferous groundwaters. Minerals, 10 (7), 635-650, [635]. (doi:10.3390/min10070635).

Record type: Article

Abstract

Gold grains, up to 40 microns in size and containing variable percentages of admixed platinum, have been identified in coals from the Leinster Coalfield, Castlecomer, SE Ireland, for the first time. Gold mineralisation occurs in sideritic nodules in coals and in association with pyrite and anomalous selenium content. Mineralisation here may have reflected very high heat flow in foreland basins north of the emerging Variscan orogenic front, responsible for gold occurrence in the South Wales Coalfield. At Castlecomer, gold(-platinum) is attributed to precipitation with replacive pyrite and selenium from groundwaters at redox interfaces, such as siderite nodules. Pyrite in the cores of the nodules indicates fluid ingress. The underlying Caledonian basement bedrock is mineralised by gold, and thus likely provided a source for gold. The combination of the gold occurrences in coal in Castlecomer and in South Wales, proximal to the Variscan orogenic front, suggests that these coals along the front could comprise an exploration target for low-temperature concentrations of precious metals.

Text
Irish Coal Minerals - Accepted Manuscript
Available under License Creative Commons Attribution.
Download (3MB)
Text
minerals-10-00635 - Version of Record
Available under License Creative Commons Attribution.
Download (1MB)

More information

Accepted/In Press date: 15 July 2020
e-pub ahead of print date: 17 July 2020
Keywords: Coal, Gold, Groundwater, Ireland, Platinum, Pyrite, Siderite, Variscan orogeny

Identifiers

Local EPrints ID: 442600
URI: http://eprints.soton.ac.uk/id/eprint/442600
ISSN: 2075-163X
PURE UUID: 7a868911-202b-4860-bcd3-ccc4e8f7c9b7

Catalogue record

Date deposited: 20 Jul 2020 16:36
Last modified: 27 Apr 2022 09:13

Export record

Altmetrics

Contributors

Author: Liam Bullock
Author: John Parnell
Author: Joseph G.T. Armstrong
Author: Magali Perez
Author: Sam Spinks

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×