The Giant Navan carbonate-hosted Zn–Pb deposit: exploration and geology: 1970–2015

Ashton, John H.; Blakeman, Robert J.; Geraghty, J.F.; O'Donovan, B.; Beach, A.; Coller, David; Philcox, M. E.; Boyce, Adrian J.; Wilkinson, Jamie J.

doi:10.1080/03717453.2016.1166607

Cited by 21 publications

(102 citation statements)

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“…We examine local controls on mineralization and the locations of feeder zones and track fluid pathways along faults and through host rocks from proximal to distal areas within two Irish-type deposits, Lisheen and Silvermines. This research builds upon previous work on metal distributions that shows the existence of metal zonation and feeders in Irish-type Zn-Pb deposits Blakeman et al, 2002;Lowther et al, 2003;Fusciardi et al, 2004;Davidheiser-Kroll et al, 2013;Ashton et al, 2015). For example, feeder zones at Lisheen and Silvermines were interpreted based on the association of low Zn/Pb ratios with textural and mineralogical evidence, such as the presence of tennantite, boulangerite, guitermanite, and chalcopyrite in the near hanging wall or along faults (Taylor, 1984;Fusciardi et al, 2004).…”

Section: Introductionmentioning

confidence: 57%

“…Navan: Another important mine within the Irish ore field is the world-class 120 Mt Navan Zn-Pb deposit (Fig. 13), whose metal distributions have been studied by several workers (Andrew and Ashton, 1985;Blakeman et al, 2002;Davidheiser-Kroll, 2014;Ashton et al, 2015). The ore is hosted mainly in the Meath Formation (Pale Beds) of the Navan Group, a varied sequence of micritic, oolitic, and bioclastic grainstones, calcareous sandstones, and siltstones (Fig.…”

Section: Comparison With Other Depositsmentioning

confidence: 99%

“…Most of the ore in the Irish Zn-Pb orefield is lithostratigraphically restricted to the Meath Formation (Pale Beds) of the Navan Group or the Waulsortian limestones and is strongly structurally controlled (Fig. 2; Hitzman and Large, 1986;Philips and Sevastopulo, 1986;Hitzman and Beaty, 1996;Ashton et al, 2015). The Waulsortian-hosted deposits occur in the hangingwall rocks of complexly segmented normal fault zones that were developed during a Lower Carboniferous rifting event (Hitzman, 1999;Carboni et al, 2003;Bonson et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…deposit are complex, and the deposit is strongly complicated by fault scarp degradation through low-angle tectonic slides. Nevertheless, based on sulfur isotope values and high Zn + Pb enrichments along faults, several feeder zones have been identified in the Main orebody of the Navan deposit (Blakeman et al, 2002;Davidheiser-Kroll, 2014;Ashton et al, 2015). As a prelude to our detailed analysis of each deposit, we first outline the basic 3-D modeling approach and the data used Philcox (1984) and Sevastopulo and Wyse-Jackson (2009).…”

Section: Introductionmentioning

confidence: 99%

“…Local names are given in italics and established stratigraphic names in bold. The stratigraphy of Silvermines is based on Taylor and Andrew (1978), Philcox (1984), and ; that of Lisheen is from Shearley et al (1996) and Hitzman et al (2002); Navan stratigraphy is derived from Philcox (1984), Strogen et al (1990), and Ashton et al (2015). Abbreviation: ABL = argillaceous bioclastic limestones.…”

Section: Introductionmentioning

confidence: 99%

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Controls on Metal Distributions at the Lisheen and Silvermines Deposits: Insights into Fluid Flow Pathways in Irish-Type Zn-Pb Deposits

et al. 2018

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The world-class Irish Zn-Pb(-Ag) deposits occur within one of the world's major metallogenic provinces. While it has been well documented that these orebodies are structurally controlled, exactly how fluids migrated from source to trap is still poorly understood. Using 3-D modeling techniques, the current study investigates metal distribution patterns at the Silvermines and Lisheen deposits to gain insights into fluid pathways and structural controls on mineralization. Distinct points along segmented normal faults are identified as the feeders to individual orebodies, allowing hot, hydrothermal, metal-bearing fluids to enter host rocks and form orebodies. These points are characterized by highly localized and elevated Ag, Cu, Co, Ni, and As concentrations as well as low Zn/Pb ratios, which increase away from the feeders. Metal distributions are initially controlled by major and minor normal faults and subsequently affected by later oblique-slip dextral and strike-slip faults. High-tonnage areas without typical feeder signals are interpreted to be structural trap sites, which are distal to fault-controlled feeder points. This study highlights both the importance of a well-connected plumbing system for metal-bearing fluids to reach their basinal traps and the control that an evolving structural framework has on spatial distribution of metals.Koen Torremans is a structural geologist who specializes in mineral deposits in sedimentary basins. He is currently a Marie Skłodowska-Curie postdoctoral fellow based at iCRAG, the Irish Centre for Research in Applied Geosciences in University College Dublin, Ireland. Koen received his B.Sc., M.Sc., and Ph.D. (2016) degrees from KU Leuven University in Belgium. He has worked extensively on base metal deposits in the Central African Copperbelt and the Irish ore field, applying a wide variety of techniques to elucidate ore deposit formation, fluid flow, and structural controls. This includes structural analysis, basin analysis, geochemistry, and geologic and numerical modeling techniques.

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Section: Introductionmentioning

confidence: 57%

Section: Comparison With Other Depositsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Controls on Metal Distributions at the Lisheen and Silvermines Deposits: Insights into Fluid Flow Pathways in Irish-Type Zn-Pb Deposits

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From Alpine-type sulfides to nonsulfides in the Gorno Zn project (Bergamo, Italy)

et al. 2019

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Recent exploration of the Gorno Zn-Pb-Ag deposit in northern Italy identified 3.3 Mt of sulfides at 4.9% Zn, 1.3% Pb, and 27.2 g/ t Ag (indicated+inferred resources), and a further mineralized nucleus of mixed sulfides-nonsulfides in the Val Vedra area, currently under evaluation. The ores are hosted in Triassic limestone and shale. Sulfides (sphalerite, Ag-bearing galena, minor pyrite, and chalcopyrite) paragenetically follow Mn-Fe-bearing saddle dolomite and sparry calcite. The mineral association, and the carbon and oxygen isotope ratios of the sparry calcite (avg. δ 13 C = 1.0 ± 0.6‰ V-PDB; avg. δ 18 O = 19.63 ± 1.25‰ V-SMOW), are in agreement with precipitation from hydrothermal fluids in a deep burial setting. Sulfide emplacement occurred before the Alpine orogeny, likely during the Early-Middle Jurassic, in analogy to other Alpine-type deposits. The nonsulfide ore formed at the expense of sulfides, and mainly consists of smithsonite, hydrozincite, hemimorphite, and cerussite. The C-Oisotope values of the early generations of Zn-carbonates are characterized by δ 18 O between 24.1 and 26.8‰ V-SMOW and δ 13 C ratios between − 3.1 and 1.7‰ V-PDB. The later generations have lower δ 18 O (21.9 to 23.9‰) and lower δ 13 C (− 6.2 to − 3.9‰). These compositions, as those measured on cerussite (δ 13 C = −6.3 and − 7.7‰; δ 18 O = 14.0 and 15.3‰), agree with the formation of the nonsulfides in a supergene environment, under climatic conditions warmer than today. The δ 18 O decrease from early to late generations suggests progressive involvement of meteoric water sourced from higher altitudes. These characteristics indicate that the nonsulfides formed during the exhumation of the Gorno area from Miocene to Pliocene.

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Economic Mining Method Evaluation for Separated Ore Lenses in Block 186 at Boliden Tara Mines, Ireland, Using Deswik Software

Klose

Hartlieb

2019

Berg Huettenmaenn Monatsh

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In block 186 of Boliden Tara Mines, Ireland, two ore lenses are separated by waste and low grade material.Long-hole open stoping is seen as an alternative method to room-and-pillar mining that permits the extraction of two waste-separated ore lenses simultaneously. Both methods are well-established at the mine. Within the scope of a bachelor's thesis, the viability of this method was investigated. This was done by using Deswik software, currently being introduced at the mine, to generate data for comparison. While the complexity of the situation necessitated a number of simplifications and adjustments, it is concluded that the separate mining of both ore lenses, as planned, is more economical.

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The Giant Navan carbonate-hosted Zn–Pb deposit: exploration and geology: 1970–2015

Cited by 21 publications

References 2 publications

Controls on Metal Distributions at the Lisheen and Silvermines Deposits: Insights into Fluid Flow Pathways in Irish-Type Zn-Pb Deposits

Controls on Metal Distributions at the Lisheen and Silvermines Deposits: Insights into Fluid Flow Pathways in Irish-Type Zn-Pb Deposits

From Alpine-type sulfides to nonsulfides in the Gorno Zn project (Bergamo, Italy)

Economic Mining Method Evaluation for Separated Ore Lenses in Block 186 at Boliden Tara Mines, Ireland, Using Deswik Software

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The Giant Navan carbonate-hosted Zn–Pb deposit: exploration and geology: 1970–2015

Cited by 21 publications

References 2 publications

Controls on Metal Distributions at the Lisheen and Silvermines Deposits: Insights into Fluid Flow Pathways in Irish-Type Zn-Pb Deposits

Controls on Metal Distributions at the Lisheen and Silvermines Deposits: Insights into Fluid Flow Pathways in Irish-Type Zn-Pb Deposits

From Alpine-type sulfides to nonsulfides in the Gorno Zn project (Bergamo, Italy)

Economic Mining Method Evaluation for Separated Ore Lenses in Block 186 at Boliden Tara Mines, Ireland, Using Deswik Software

Contact Info

Product

Resources

About

Economic Mining Method Evaluation for Separated Ore Lenses in Block 186 at Boliden Tara Mines, Ireland, Using Deswik Software