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United Kingdom
Curraghinalt Project

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 Location:
15 km NE from Omagh, United Kingdom

  Project Contacts:
3 Killybrack Road Killybrack Business Park
Omagh
United Kingdom
BT79 7DG
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  • Fleet
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  • Filings & News

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Overview

StageFeasibility
Mine TypeUnderground
Commodities
  • Gold
  • Silver
Mining Method
  • Pillar mining
  • Resue mining
  • Cut & Fill
  • Longhole open stoping
  • Split-shooting
  • Uppers Retreat
  • Cemented backfill
  • Dry waste backfill
Mine Life11 years (as of Jan 1, 2016)


Owners

Source: p. 4
CompanyInterestOwnership
Dalradian Resources Inc. 100 % Indirect
Dalradian Gold Ltd. (operator) 100 % Direct
Dalradian holds, through its wholly-owned subsidiary Dalradian Gold Ltd. (Dalradian Gold), a 100 percent interest.

Contractors

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Deposit Type

  • Vein / narrow vein
  • VMS
  • Orogenic
  • Mesothermal


Summary:

Dalradian’s Northern Ireland property has potential to host two distinct deposit types. Licences DG1, DG3,DG4, DG5 and DG 6 which includes the Curraghinalt gold deposits, has potential to host orogenic gold deposits. Licence DG2, underlain by the Tyrone Igneous Complex, has potential to host volcanic massive sulphide mineralization (VMS), as well as porphyry copper-gold, and irongold exhalites (Hollis et al., 2014; Hollis et al., 2015; British Geological Survey, 2016).

Orogenic Gold Deposits
Rice et al. (2016) noted that the timing of gold mineralization at Curraghinalt (ca. 462.7 – 452.8 Ma) closely followed peak metamorphism associated with the Grampian event of the Caledonian Orogeny. It is temporally linked with an extensional setting following orogenic uplift and collapse. Rice et al. (2016) concluded that Curraghinalt is more likely an orogenic (rather than intrusion related) gold deposit. Thus an orogenic gold deposit model best describes the Curraghinalt vein system.

Volcanic Massive Sulphide Deposit Model
The volcanic stratigraphy of the Tyrone underlying licence DG2 is a potential host to volcanic massive sulphide deposits. VMS deposits are syngenetic, stratabound, and in part stratiform accumulations of massive to semi-massive sulphide that form seafloor hydrothermal systems at or near the seafloor (Gibson et al., 2007; Galley et al., 2007). The deposits consist of two parts: a concordant massive sulphide lens (>60 percent sulphide ........


Mining Methods

  • Pillar mining
  • Resue mining
  • Cut & Fill
  • Longhole open stoping
  • Split-shooting
  • Uppers Retreat
  • Cemented backfill
  • Dry waste backfill


Summary:

The FS mine plan is based on a ramp access underground mining operation producing and average of 1,400 t/d of ore from a blend of mining methods, including lateral development, cut & fill and longhole (i.e. longhole stoping, upper retreat and pillar recovery).

Initial mine development at Curraghinalt will take place from the existing exploration adit and from a newly ramp access which will be collared near the proposed process plant site. Mining methods selected for the Curraghinalt project were chosen to maintain mining flexibility and selectivity for the various anticipated ground conditions. The majority of Mineral Reserves will be mined by longhole open stoping (66% combined longhole, uppers and pillar recovery), plus 17% cut & fill and 17% from development in ore. The mine design will use 18 m sub-levels (floor to floor) and strike lengths averaging 15 m depending on geotechnical parameters. The average diluted stope width will be 1.6 m; however, widths can vary between 1.2 to 3.5 m. The minimum mining width is 1.0 m. Paste backfill, produced in a backfill plant located underground, will be made from a mixture of tailings and cement and will be the primary backfill material, with unconsolidated waste rock from development headings used where possible. An internal ore pass system will direct ore and waste to the haulage levels where diesel powered haul trucks will transport the material to surface via the main ramp that will daylight adjacent to the process ........


Crushing and Grinding
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Processing

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Summary:

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Projected Production:

CommodityUnitsLOM
Gold koz 1,356
Silver koz  ......  Subscription required
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Daily ore mining rate 1,400 t *
Ore tonnes mined, LOM 5,239 kt *
Daily processing capacity 1,500 kt *
Tonnes processed, LOM 5,239 kt *
Annual ore mining rate 511 kt *
* According to 2016 study.

Reserves at May 10, 2018:
Underground mineral resources are reported at a cut-off grade of 5.0 g/t gold.

CategoryTonnage CommodityGradeContained Metal
Measured 34 kt Gold 26 g/t 28 koz
Indicated 6,309 kt Gold 14.95 g/t 3,033 koz
Measured & Indicated 6,343 kt Gold 15.01 g/t 3,061 koz
Inferred 7,722 kt Gold 12.24 g/t 3,038 koz

Commodity Production Costs:

CommodityUnitsAverage
All-in sustaining costs (AISC) Gold USD 674 / oz *†  
All-in costs Gold USD 815 / oz *†  
Assumed price Silver USD 17 / oz *  
Assumed price Gold USD 1,250 / oz *  
* According to 2016 study / presentation.
† Net of By-Product.

Operating Costs:

Units2016
UG mining costs ($/t milled) USD 84.4 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required
* According to 2016 study.
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2016 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M USD  ......  Subscription required
Sustaining CapEx $M USD  ......  Subscription required
Closure costs $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
UG OpEx $M USD  ......  Subscription required
Processing OpEx $M USD 145.8
G&A costs $M USD 59
Total OpEx $M USD  ......  Subscription required
Total Taxes $M USD  ......  Subscription required
Royalty payments $M USD  ......  Subscription required
Net revenue (LOM) $M USD  ......  Subscription required
Net Operating Income (LOM) $M USD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M USD  ......  Subscription required
After-tax Cash Flow (LOM) $M USD  ......  Subscription required
Pre-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
After-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of December 12, 2016:
HME TypeSizeQuantity
Backhoe & Rock Breaker ....................... Subscription required
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 4, 2022
....................... Subscription required ....................... Subscription required Subscription required Dec 12, 2016
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Staff:

Total WorkforceYear
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
Technical Report 2018
Feasibility Study Report 2017
Preliminary Economic Assessment 2016
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