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Australia
Darlot Mine

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 Location:
57 km E from Lienster, Western Australia, Australia

  Address:
Level 2 35 Ventnor Avenue
West Perth
Western Australia, Australia
6005
Phone  ...  Subscription required
Fax(61-8) 9481 5950
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Longhole stoping
  • Cemented backfill
  • Paste backfill
Processing
  • Gravity separation
  • Smelting
  • Dry Screening
  • Carbon re-activation kiln
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life5 years (as of Jan 1, 2020)
The commencement of processing operations at KOTH in the June Quarter 2022 will provide a more costeffective processing alternative for Darlot ore, repositioning Darlot as a high-grade satellite ore source for KOTH.
Latest NewsRed 5 Identifies High-Grade Resource Expansion Potential At Darlot Underground Mine     February 22, 2022


Owners

Source: p. 19
CompanyInterestOwnership
Darlot Mining Company (Pty) Ltd. (operator) 100 % Direct
Red 5 Ltd. 100 % Indirect

Deposit Type

  • Vein / narrow vein
  • Hydrothermal
  • Porphyry


Summary:

• The Darlot lodes are considered to be part of an Archean hydrothermal faultvein deposit with many similar characteristics with other deposits within the Yilgarn Craton, namely host rock type and nature of hydrothermal alteration; however, it is atypical in being relatively flat-lying rather than steeply dipping. Felsic porphyries and lamprophyre intrusions are encountered throughout the deposit. The major host for gold mineralisation is the Mount Pickering Dolerite.

Gold mineralisation is associated with quartz veins and alteration haloes controlled by major D2 and D3 structures or secondary splays and cross-linking structures. The quartz veins are hosted mainly by magnetic dolerite and magnetic quartz dolerite rock types and, to a lesser extent, by non-magnetic dolerite and felsic volcano-sedimentary rock types. Lamprophyre intrusions are present in the area with a variety of orientations. In most cases the lamprophyres are thought to be pre- mineralisation but are an un-favorable host rock for mineralisation and in most cases are barren.

The hanging-wall and footwall veins associated with the Lords Felsics mineralisation typically dip to the North between ~3° and ~10° with the Main Lords structure dipping at around 40° to the NW. The Newlands Fault is also included in the resource and dips to the SE at around 6°, (All azimuths stated above are Darlot Mine Grid referenced)

The Lords Felsics area is yet to be mined, hence the veracity of this estimate is yet to be proven by reconciliation data.

The grade in the ore bodies is controlled by both structure and host lithology, in that typically the best grades are hosted by the Magnetic Dolerite and Felsic intrusions, with comparatively lesser grades observed in the other host rocks such as the non-magnetic dolerite. Consequently, host lithology for lodes was a key factor considered for the estimate.

The deposit has an overall strike length of about 1.75km and a width of about 900 m and extends from about 660m to 1,460 m below the natural surface.


Mining Methods

  • Longhole stoping
  • Cemented backfill
  • Paste backfill


Summary:

The principal mining method used for the underground operation at Darlot is long-hole stoping with cemented paste fill where required, with only a small proportion of stopes expected to be filled with paste. This is a proven mining method at Darlot that is associated with good productivities and reasonable costs. Ground conditions underground at Darlot are good. Mine designs have had 20% planned external dilution applied.

Selected mining method deemed appropriate based on geotechnical advice and previous experience and history at Darlot.

Assumptions have been based on actual mining performance at Darlot with Geotechnical Assessments undertaken over the years to develop a comprehensive ground support and reinforcement regime for conditions encountered at Darlot.

Stopes have been designed based on revenue from individual Service blocks. Where this has not been completed an economic cut-off of 2.3 g/t was applied.

Mining dilution of 10 to 20% has been used to development & stoping respectively.

Average mining recovery factor of 90% is applied based on mining methods.

Minimum stope widths of 1.5m for Longhole stopes.

Designed stopes with greater than 50% inferred blocks are excluded from the reported reserve.

Darlot is an operating underground mine and as such all the required infrastructure is in place and operational. Minor Capital Development will be required to extract all of the ore reserve.

The high-grade Oval West deposit was the primary ore source from the Darlot Gold Mine, with bulk stoping continuing throughout most of FY20. The majority of high-grade stopes at Oval West were largely depleted by the end of the reporting period. [AR, 6/30/2020]


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1
Cone crusher 2
Ball mill 2


Processing

  • Gravity separation
  • Smelting
  • Dry Screening
  • Carbon re-activation kiln
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

Ore from the Darlot underground operation will be processed at the existing nameplate 0.83Mtpa gravity and carbon-in-leach (CIL) processing facility. Metallurgical recovery of 94% has been used, which is in line with historical gold recoveries at Darlot.

The Darlot processing plant is currently operating and is a conventional design.

No additional testwork was undertaken as all the ore reserve is contained within previously mined orebodies which are currently being processed on site.

Recoveries through the Darlot processing plant have averaged 94%.

There have been no deleterious elements identified while processing Darlot ore.

Recoveries & Grades:

CommodityParameter202120202019201820162015
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required93.595.395.3
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required3.54.756.08

Production:

CommodityUnits2022202120202019201820172016
Gold koz  ......  Subscription required ^  ......  Subscription required   ......  Subscription required   ......  Subscription required 48 3966
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
* Combined production for Darlot Mine and King of the Hills Mine
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required497 kt449 kt
Tonnes milled  ......  Subscription required  ......  Subscription required
Annual processing rate  ......  Subscription required  ......  Subscription required
Annual processing capacity  ......  Subscription required  ......  Subscription required0.83 Mt0.83 Mt0.83 Mt0.8 Mt
Total tonnes mined  ......  Subscription required  ......  Subscription required635 kt
Waste  ......  Subscription required  ......  Subscription required186.6 kt
Tonnes processed  ......  Subscription required  ......  Subscription required453.7 kt
Subscription required - Subscription is required.

Reserves at June 30, 2020:
Cut-off grade for reported reserves is 2.0 - 2.3 g/t Au.

Cut-off grades for reported resources are:
underground Darlot - 2.0 g/t Au;
underground Great Western - 1.5 g/t Au;
open-pit Darlot and Great Western - 0.5 g/t Au.

CategoryOreTypeTonnage CommodityGradeContained MetalRecoverable Metal
Proven Total 11.9 kt Gold 2.2 g/t 0.8 koz 0.8 koz
Probable Total 2,607 kt Gold 2.8 g/t 234 koz 219 koz
Proven & Probable Total 2,619 kt Gold 2.8 g/t 235 koz
Measured Total 78 kt Gold 4.2 g/t 6 koz
Indicated Total 6,596 kt Gold 4 g/t 847 koz
Inferred Total 5,077 kt Gold 2.6 g/t 421 koz
Total Resource Total 11,752 kt Gold 3.4 g/t 1,273 koz

Commodity Production Costs:

CommodityUnits2017201620152014
All-in sustaining costs (sold) Gold USD 1,432 / oz† 1,238 / oz† 1,057 / oz† 1,222 / oz†
All-in costs Gold USD 1,432 / oz† 1,238 / oz† 1,057 / oz† 1,222 / oz†
† Net of By-Product.

Financials:

Units20162015
Capital expenditures M USD 21.4   20  
Revenue M USD 83.1   91.3  
Operating Income M USD 11   6.3  
Gross profit M USD 25.4   32.1  


Heavy Mobile Equipment:
HME TypeModelSizeQuantityLeased or
Contractor
Ref. Date
Drill (long hole) ....................... Subscription required ....................... Subscription required Jul 14, 2014
Jumbo ....................... Subscription required ....................... Subscription required Jul 14, 2014
Loader ....................... Subscription required ....................... Subscription required Jul 14, 2014
Loader ....................... Subscription required ....................... Subscription required Jul 14, 2014
Truck (haul) ....................... Subscription required 50 t ....................... Subscription required Jul 14, 2014
Truck (haul) ....................... Subscription required 60 t ....................... Subscription required Jul 14, 2014
Truck (haul) ....................... Subscription required ....................... Subscription required Leased Dec 31, 2018
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 11, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Year-end Mineral Reserves 2018
Form 20-F 2017
Project Description 2017
Annual Report 2016
Financial Review 2016
Year-end Mineral Reserves 2016
Financial Review 2015
Year-end Mineral Reserves 2015
Corporate Presentation 2014
Subscription required - Subscription is required.

News:

NewsDate
Red 5 Identifies High-Grade Resource Expansion Potential At Darlot Underground Mine February 22, 2022
Red 5 forges a Redpath with Darlot development October 4, 2021
All gold but no diggers for Red 5 May 21, 2021
Red 5 Ltd.: SRG Global receives Great Western contract ahead of mining start February 4, 2021
Red 5 locks in Great Western production restart with mining contract October 15, 2020
Red 5 Limited: Full processing operations resumed at Darlot mine March 26, 2018

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