A Methodology to Determine the Acid-Neutralization Capacity of Rock Samples

Weber, P.A.; Thomas, Joan E.; Skinner, William; Smart, Roger St. C.

doi:10.2113/gscanmin.43.4.1183

Cited by 43 publications

(31 citation statements)

References 24 publications

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“…Kinetic NAG profiles (pH and temperature) for samples PF, MS, and PAF-H have been published previously (Weber et al, 2004;Weber et al, 2005a) and no lag period was observed prior to pH decrease to below a pH of 4.0. This is expected for samples that are acidic as identified by the paste pH test.…”

Section: Kinetic Nag Testingmentioning

confidence: 54%

“…These results are from the SENZ ARD database and details are provided in Appendix 1. The AMIRA samples have previously been discussed and detailed mineralogical assessments provided (Weber et al, 2004b(Weber et al, , 2005a. Samples are from a variety of localities including the Kaltim Prima coal mine, Kalimantan, Indonesia (Samples MS and PF); the PT Freeport Grasberg Mine, Papua Province, Indonesia (sample PAF-H); Newcrest Cadia mine, Australia (sample C); Placer Pacific Osborne mine, Australia (sample U -tailings composite); Newcrest Telfer mine, Australia (sample T); and Kalgoorlie Consolidated Gold Mines, Australia (samples BS and UM).…”

Section: Samplesmentioning

confidence: 99%

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SHORT-TERM ACID ROCK DRAINAGE CHARACTERISTICS DETERMINED BY PASTE pH AND KINETIC NAG TESTING: CYPRESS PROSPECT, NEW ZEALAND

Weber¹,

Hughes²,

Conner³

et al. 2006

JASMR

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Abstract. The paste pH test (1 part solid: 2 parts water) is one method used to determine the acidic nature of a rock/soil sample. In conjunction with kinetic NAG testing a classification scheme has been developed for the Cypress Prospect within the Stockton coal mining region, West Coast, New Zealand. Samples having a paste pH of < 4.0 are considered potentially acid forming (PAF) and contain significant acidic sulfate salts (up to 30.1 kg H 2 SO 4 /t equivalent) that will immediately produce acid upon exposure to water. Samples with a paste pH of 4.0 -5.0 are considered PAF, but have a lower stored acidic salt content (up to 9.0 kg H 2 SO 4 /t equivalent). In the field the lithologies represented by both these rock types are likely to generate ARD immediately upon exposure to water. Circum-neutral paste pH values (> pH 5.0) for samples classified PAF indicated that they have a short-term acid neutralization capacity (ANC) that is greater than the readily available short-term acid generating capacity of the sample. This resulted in a time lag (2 -356 minutes) prior to decrease to pH 4 in the kinetic NAG test. Samples having a paste pH > 6.0 typically produced a longer lag period than those with a paste pH of 5 -6. As previous researchers have demonstrated this represents a lag period prior to the onset of laboratory acid rock drainage in larger column leach tests. These results have direct application to strategic mine planning at the proposed Cypress mine including separating waste rock into immediate acid generators (high management priority) from acid generators with a lag to acid formation (lower priority) and non-acid forming. Field validation of this classification system is still needed.

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Section: Kinetic Nag Testingmentioning

confidence: 54%

Section: Samplesmentioning

confidence: 99%

SHORT-TERM ACID ROCK DRAINAGE CHARACTERISTICS DETERMINED BY PASTE pH AND KINETIC NAG TESTING: CYPRESS PROSPECT, NEW ZEALAND

Weber¹,

Hughes²,

Conner³

et al. 2006

JASMR

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“…7a). However, this parameter does not take into account the possible neutralizing capacities of minerals in the rock (Weber et al 2005) or the varying reactivities of different sulphide minerals.…”

Section: Acid Generation Predictionmentioning

confidence: 99%

“…The metasandstone in the lower grade regional metamorphic rocks typically contains albitic plagioclase; however, in the contact metamorphic aureole plagioclase (10-40 modal %) is typically more Ca-rich (oligoclase to andesine) which adds to the neutralizing power. Minerals containing Mg (biotite and chlorite) also contribute to buffering ARD, but play a minor role (Weber et al 2005). In the Goldenville and Halifax groups it is likely that the abundance of plagioclase and its alteration products, along with carbonate minerals, largely determine the neutralizing power in high sulphur samples.…”

Section: Acid Generation Predictionmentioning

confidence: 99%

Lithogeochemistry, petrology, and the acid-generating potential of the Goldenville and Halifax groups and associated granitoid rocks in the metropolitan Halifax Regional Municipality, Nova Scotia, Canada

White

Goodwin²

2011

atgeol

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Detailed geological mapping of the Goldenville and Halifax groups in metropolitan Halifax Regional Municipality, Nova Scotia, resulted in two-fold subdivision of both groups. The Goldenville Group was divided into the metasandstone (feldspathic wacke)-dominated Taylors Head formation and the overlying, metasiltstone-dominated, Mn-rich Beaverbank formation. The Halifax Group was divided into the Cunard formation, dominated by sulphide-rich slate, and the overlying Bluestone formation, consisting of mainly metasiltstone and metasandstone. Lithogeochemical and petrological studies resulted in the characterization of the Beaverbank, Cunard, and Bluestone formations as potential acid-producing units with pyrrhotite as the main iron-sulphide mineral. The presence of acid rock drainage (ARD) is governed by bulk-rock chemical composition and mineral assemblage. To test the predictability of ARD production, a portable XRF instrument was used to obtain relatively inexpensive whole-rock and sulphur data that were used in conjunction with conventional XRF analyses and acid-base accounting tests. Results from the three methods compare favourably. Use of the portable XRF instrument facilitates a timely and cost-effective approach to predicting ARD but does not replace the legally mandated acid-base accounting procedure. RÉSUMÉUne cartographie géologique détaillée des groupes de Goldenville et de Halifax dans la municipalité régionale de Halifax, en Nouvelle-Écosse, a donné lieu à deux divisions de ces deux groupes. Pour ce qui est du groupe de Goldenville, les deux formations suivantes ont été établies: la Formation de Taylors Head, composée principalement de métagrès (wacke feldspathique) et la Formation de Beaverbank sus-jacente, composée principalement de métasiltite riche en Mn. En ce qui concerne le groupe de Halifax, les deux formations que voici ont été identifiées: la Formation de Cunard, composée principalement d'ardoise riche en sulfures, et la Formation de Bluestone sus-jacente, composée surtout de métasiltite et de métagrès. Les études lithogéochimiques et pétrologiques ont permis d'établir que les Formations de Beaverbank, de Cunard et de Bluestone étaient susceptibles d'agir comme précurseurs acides, la pyrrhotite étant le principal minéral à sulfure de fer présent. La présence d'un drainage rocheux acide (DRA) est régie par la composition chimique de la roche brute et l'association minérale. Pour vérifier la possibilité d'un DRA, de concert avec des analyses traditionnelles à fluorescence X et de bilan acide-base, un appareil portatif à fluorescence X a été utilisé pour recueillir de manière relativement économique des données sur la roche brute et les sulfures. Les résul-tats obtenus par les trois méthodes se comparent bien. L'utilisation d'un appareil à fluorescence X portatif permet de prédire de manière économique et rapidement la possibilité du DRA, mais cette technique ne saurait se substituer à l'analyse du bilan acide-base prévue par la réglementation.[Traduit par la redaction]

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“…[7] Static tests are geochemical analyses of sulfidic waste which are used to predict potential of waste sample to produce acid. Details on these tests are documented in the literature [8][9][10][11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Physical chemical characterization of historical mining waste and ARD prediction tests

et al. 2017

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Abstract. There are thousands of historical mine tailings and metallurgical residues present on inactive metal mining sites which have been abandoned. However, the potential release of dissolved metals, acidity, or suspended particulates from mine-waste dumps can be a serious and long-lasting problem. A variety of environmental impacts may occur at this abandoned mine sites and leading the list is acid generation, which is one of the main problems from metal mining. The objective of the present study was to characterize and evaluate the Romanian historical tailing of Sasar-Red Valley, near Baia Mare. This involved physical and chemical characterization of the materials and its acid generating potential. Sasar tailing impoundment contains 8.5 million m 3 of tailings and occupies an area of 32.5 hectares. Tailings samples were collected from different depths in three sampling points, and characterized by grain size, chemical elements concentration, elements distribution of elements in depth, paste pH, acid-base account and net acid generation tests. Acid base accounting (ABA) tests in conjunction with net acid generation (NAG) tests classified the samples into the category of 'potentially acid generating'. This paper presents a synthesis of works performed in the Improve Resource Efficiency and Minimize Environmental Footprint (REMinE) project.

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A Methodology to Determine the Acid-Neutralization Capacity of Rock Samples

Cited by 43 publications

References 24 publications

SHORT-TERM ACID ROCK DRAINAGE CHARACTERISTICS DETERMINED BY PASTE pH AND KINETIC NAG TESTING: CYPRESS PROSPECT, NEW ZEALAND

SHORT-TERM ACID ROCK DRAINAGE CHARACTERISTICS DETERMINED BY PASTE pH AND KINETIC NAG TESTING: CYPRESS PROSPECT, NEW ZEALAND

Lithogeochemistry, petrology, and the acid-generating potential of the Goldenville and Halifax groups and associated granitoid rocks in the metropolitan Halifax Regional Municipality, Nova Scotia, Canada

Physical chemical characterization of historical mining waste and ARD prediction tests

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