Book: Pyrite: A natural history of fool’s gold

A natural history of fool’s gold

David Rickard (Emeritus Professor at Cardiff University, Wales, UK) has written a book titled Pyrite: A Natural History of Fool’s Gold. The book was officially published today (25th June 2015) by Oxford University Press USA.

Synopsis from amazon

“Most people have heard of pyrite, the brassy yellow mineral commonly known as fool’s gold. But despite being the most common sulfide on the earth’s surface, pyrite’s bright crystals have attracted a noteworthy amount of attention from many different cultures, and its nearly identical visual appearance to gold has led to tales of fraud, trickery, and claims of alchemy.

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Seminar: preventing acid rock drainage

acid rock drainage Prevention

SRK Consulting have uploaded a seminar from their second Mining Seminar Series held in January 2015 in Vancouver, British Columbia, Canada. Stephen Day (Principal Geochemist) presented a talk titled “Segregating waste rock to prevent acid rock drainage”. Acid rock drainage is a major problem principally linked to the oxidation of pyrite.

Talk abstract

“Mines have been proactively managing waste rock to address acid rock drainage (ARD) potential since the 1990s. The typical management approach leads to segregation of rock that has potential for ARD generation (PAG) from rock that is non-PAG.”

“The PAG rock is then disposed of appropriately to limit ARD (for example, underwater in an impoundment or completed pit), whereas non-PAG rock may be suitable for conventional disposal or use as construction fill, such as for a tailings dam.

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Ireland: Update on Pyrite Resolution Board Statistics

Pyrite Resolution Board Statistics of Applications

This post provides information of the Pyrite Resolution Board Statistics. The Pyrite Resolution Board has produced four reports since the Pyrite Remediation Scheme was introduced in February 2014. Further statistics are provided on the PRB website and in recent news articles. See statistics below and follow links for original data.

Statistics reported by the Pyrite Resolution Board for 1st May 2015:

  • Total 712 applications (significant pyritic damage)
  • 107 applications in Validation Stage
  • 97 applications at Verification Stage
  • 508 applications included in the scheme
  • 7 applications refused

Statistics reported in the fourth quarterly report of the PRB:

26th February 2014 to 1st January 2015:

  • 622 completed applications
  • 27 developments containing multiple applications
  • 47 single site applications
  • 483 Validated applications
  • 321 applications included in scheme
  • Average 3 applications per wee since 3rd quarterly report
  • 2 appeals in process
  • Pilot project of 5 dwellings remediated (September to November 2014)

The Irish Independent reported an update on the Pyrite Remediation Scheme statistics for the end of January 2015:

  • Total 632 applications
  • 485 applications Validated
  • 328 applications included in scheme
  • Work at tender stage for 73 dwellings
  • Work completed on 5 dwellings

Statistics reported by the Pyrite Resolution Board for 31st October 2014:

  • Total 590 applications
  • 151 applications in Validation Stage
  • 231 applications at Verification Stage
  • 208 applications included in the scheme

Statistics reported by the Pyrite Resolution Board for 7th October 2014:

  • Total 575 completed applications and 36 commenced applications
  • 144 applications in Validation Stage
  • 220 applications in Verification Stage
  • 2 Verified applications awaiting decision
  • 206 applications included in the scheme
  • Remediation contracts in place for 5 dwellings
  • 3 applications not considered

Statistics reported by the Pyrite Resolution Board for 4th July 2014:

  • Total 521 completed applications and 35 commenced applications
  • 312 applications in Validation Stage
  • 127 applications in Verification Stage
  • 27 Verified applications awaiting decision
  • 52 applications included in the scheme
  • 3 applications not considered
Statistics reported by the Pyrite Resolution Board for 15th April 2014:
  • 418 completed applications and 146 commenced applications
  • 84 applications Validated and referred to Verification Stage
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Guest post: Pyrite oxidation in roofing slates by Víctor Cárdenes Van den Eynde

The first guest post on pyriteproblem.com comes from Dr. Víctor Cárdenes Van den Eynde. Victor started his career in the slate industry of Galicia (Spain), later moving to the Slate Technology Center Foundation (Galician Association of Slate Producers). There, he developed various methods of inhibiting oxidation of iron sulfides in roofing slates.

He later moved to the University of Oviedo, working as a reseacher and completing a Masters in Geological and Geotechnical Resources in 2010 and a PhD in roofing slate in 2012. He currently researches the petrophysics and weathering of building materials. Further information about Victor’s research and publications can be found at the end of this post.… Read the rest

Research paper: Lime stabilisation for earthworks: a UK perspective

Lime Stabilisation in the UK

Paul Beetham (Loughborough University), Tom Dijkstra (BGS), Neil Dixon (Loughborough University), Paul Fleming (Loughborough University), Robert Hutchison (Opus) and John Bateman (Independent consultant) have published a review paper on the application of lime stabilisation in UK earthworks.

The paper, titled “Lime stabilisation for earthworks: a UK perspective” considers the chemistry of the lime stabilisation process and the implications of the minimum mellowing period and air voids. The role of sulfate swelling in lime stabilised materials and how the risk of the this may be reduced is also discussed. The full abstract from the ICE Proceedings: Ground Improvement is shown below.… Read the rest

Research Paper: Modelling pyritic shale expansion

Pyritic Shale Expansion

Shad Hoover, Whitney Greenawalt and Brian Tittmann (all of CMT Laboratories Inc, State College, PA, USA) have published a paper on the measurement of pyritic shale expansion due to the oxidation of pyrite. The authors use laboratory oxidation experiments and theoretical geochemical models to estimate expansion rates and magnitudes.

The paper is titled “Experimental and Theoretical Modeling of Expansion in Pyritic Shale”.

Abstract

“Expansive pyritic shales are found in black carbonaceous shales throughout the United States as well as in other countries, including Ireland, England, Norway, Canada, and Sweden. Expansion occurs when the pyrite, which occurs either as finely disseminated syngenetic framboids, macroscopic crystals, or diagenetic replacement fossils, oxidizes to form sulfuric acid.
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Research paper: sulfide-bearing aggregate in concrete

Sulfide-bearing Aggregate

Andreia Rodrigues and others at the Centre de Recherche sur les Infrastructures en Beton (Universite Laval) in Quebec, Canada have published a paper on the development of a laboratory test that attempts to reproduce the deterioration of mortar due to the oxidation of sulfide minerals in sulfide-bearing aggregate.

The paper, titled “A new accelerated mortar bar test to assess the potential deleterious effect of sulfide-bearing aggregate in concrete” adds to previous research by the authors on problems related to iron sulfides in concrete in Canada. The full abstract from Cement and Concrete Research is shown below.… Read the rest

Research paper: effect of temperature and moisture on the behaviour of pyritic fill

Behaviour of Pyritic Fill

Amy Taylor and others at the University of Sheffield have published a paper on the in situ monitoring of moisture content and temperature beneath the ground-bearing floor slab of a structure to understand the behaviour of pyritic fill material.

The paper, titled “The Effect of Temperature and Moisture Content on the Behaviour of Pyritic Fill: Development of an In Situ Monitoring System” adds to existing paper on the same topic by Taylor et al., (2013): Taylor, A.J., Cripps, J.C., and Clarke, S.D. (2013). An in-situ monitoring system for natural temperature and relative humidity.Read the rest

Research paper: sulphate-generated heave rates in Ireland

Sulphate-Generated Heave Rates

Bryan McCabe and others at the National University of Ireland, Galway, have published a paper on the quantification of expansion rates of pyritiferous mudstone-siltstone from Ireland.

The paper, titled “Pyritiferous mudstone–siltstone: expansion rate measurement and prediction” adds to existing research on the expansion of pyritic fills published by Maher et al., (2011) and Sutton et al., (2013). McCabe et al., (2015) show that the density of pyritic fill and the depth of submergence in water strongly influence the rate of expansion. Furthermore, the authors found that pyrite content was the major control on the degree of expansion.… Read the rest

Update on Pyrite Resolution Board applications

Pyrite Resolution Board Applications

The Pyrite Resolution Board (PRB) has produced three reports since the Pyrite Remediation Scheme was introduced in February 2014. Further statistics are provided on the PRB website and in recent news articles. See statistics below and follow links for original data.

The Irish Independent reported an update on the Pyrite Remediation Scheme statistics last week for the end of January 2015:

  • Total 632 applications
  • 485 applications Validated
  • 328 applications included in scheme
  • Work at tender stage for 73 dwellings
  • Work completed on 5 dwellings

Statistics reported by the Pyrite Resolution Board for 31st October 2014:

  • Total 590 applications
  • 151 applications in Validation Stage
  • 231 applications at Verification Stage
  • 208 applications included in the scheme

Statistics reported by the Pyrite Resolution Board for 7th October 2014:

  • Total 575 completed applications and 36 commenced applications
  • 144 applications in Validation Stage
  • 220 applications in Verification Stage
  • 2 Verified applications awaiting decision
  • 206 applications included in the scheme
  • Remediation contracts in place for 5 dwellings
  • 3 applications not considered

Statistics reported by the Pyrite Resolution Board for 4th July 2014:

  • Total 521 completed applications and 35 commenced applications
  • 312 applications in Validation Stage
  • 127 applications in Verification Stage
  • 27 Verified applications awaiting decision
  • 52 applications included in the scheme
  • 3 applications not considered
Statistics reported by the Pyrite Resolution Board for 15th April 2014:
  • 418 completed applications and 146 commenced applications
  • 84 applications Validated and referred to Verification Stage
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