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Australia
Andy Well Mine

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 Location:
45 km N from Meekatharra, Western Australia, Australia

  Regional Office:
1292 Hay Street 6000
West Perth
Western Australia, Australia
Phone  ...  Subscription required
Fax08-9226-0633
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Avoca
Processing
  • Gravity separation
  • Intensive Cyanidation Reactor (ICR)
  • Carbon re-activation kiln
  • Concentrate leach
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
The Andy Well Gold Project was transitioned to care and maintenance during November 2017.
Latest NewsSilver Lake divests Andy Well and Gnaweeda projects     December 21, 2020


Owners

Source: p. 6
CompanyInterestOwnership
Silver Lake Resources Ltd. 100 % Indirect
The Andy Well Project wholly owned by Doray Minerals Limited.

Doray Minerals merges with Silver Lake Resources in 2019, Silver Lake Resources seeks to divest Andy Well as a non-core asset.

Latitude Consolidated Limited (ASX: LCD) ('Latitude' or 'the Company') is pleased to announce the signing of a Binding Agreement (Share Sale Agreement) with Silver Lake Resources Ltd (ASX: SLR) (Silver Lake) to acquire 100% of the issued capital of Andy Well Mining Pty Ltd (Andy Well), the owner of the Andy Well and Gnaweeda Projects.

Latitude has agreed to pay a non-refundable $250,000 deposit and the transaction is expected to close in early 2021.

Deposit Type

  • Porphyry


Summary:

The geology of the prospect includes weathered metamorphic and intrusive rocks, with quartz veining and banded ron formation outcrops. The greenstones are tightly folded, and cut by late intrusive dolerite dykes. Gold mineralisation at Andy Well is associated with ultramafic and felsic porphyry’s and altered mafic schists.

The area has been subject to some historic drilling, with the last work carried out in 2000 prior to DRM's recent campaign. Historic intersections include 10m @ 7.2g/t Au and 19m @ 2.86 g/t Au. Only around 12% of the prior drill holes were completed to more than 100m in total depth, with only shallow drilling conducted in the southern half of the prospect. DRM believed there was potential to outline a significant gold deposit due to the widely space drilling and extensive distribution of mineralisation across 2km of strike length and over 200m in width.


Mining Methods

  • Avoca


Summary:

Operator ceasing open pit mining in the second half of 2016 and transitioning to a purely underground operation.

FY2016 saw the continuation of the “modified Avoca” mining method as the primary technique being used at Andy Well. Since the introduction of this mining method, a reduction in the average mining width being achieved has resulted in reported mine grades above the latest published Reserve grade. While the 30 June 2015 Resource and Reserve Statement Reserve assumed an average mining width of 3 meters, mining widths have been further improved across both Wilber and Judy with some stopes reducing to 1.5m wide. The continuing success of this method of ground stabilisation and control is planned to be deployed for all future mining underground at Andy Well.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Ball mill 500 kW 1

Summary:

The Andy Well process plant is designed for a nominal 20 tph milling rate. Run of mine material is fed to the crushing plant at a design rate of 60 tph with crushed ore storage capacity installed to provide a physical break between crushing and milling operations.

Ore is passed through a two stage crushing circuit. Crushed ore is stored in a fine ore bin with a live capacity of 360 tonnes. The grinding circuit consists of a single stage 500 kW ball mill.


Processing

  • Gravity separation
  • Intensive Cyanidation Reactor (ICR)
  • Carbon re-activation kiln
  • Concentrate leach
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

The design of the facility would incorporate crushing, grinding, gravity and CIL gold recovery, and is based on the excellent results received from extensive metallurgical testwork carried out on the Wilber Lode deposit.

The Andy Well process plant is designed for a nominal 20 tph milling rate.

Ore is passed through a two stage crushing circuit. Crushed ore is stored in a fine ore bin with a live capacity of 360 tonnes. The grinding circuit consists of a single stage 500 kW ball mill. Gold recovery consists of both a gravity circuit containing gravity concentrators and intensive cyanidation unit and a conventional carbon in leach (CIL) arrangement consisting of seven CIL tanks. Loaded carbon is stripped of gold using a Split Anglo type elution circuit and gold will be subsequently recovered from the cathodes of the gravity and elution electrowinning cells.

Recoveries & Grades:

CommodityParameter2017201620152014
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 5.189.1510.8
Subscription required - Subscription is required.

Production:

CommodityUnits2017201620152014
Gold oz 52,92484,13588,73676,785

Operational Metrics:

Metrics2017201620152014
Ore tonnes mined  ......  Subscription required323,949 t394,728 t233,549 t
Tonnes processed  ......  Subscription required337,443 t309,542 t225,433 t

Reserves at June 30, 2019:

CategoryTonnage CommodityGradeContained Metal
Measured 127 kt Gold 13.7 g/t 56 koz
Indicated 1,063 kt Gold 9.2 g/t 315 koz
Measured & Indicated 1,190 kt Gold 9.7 g/t 371 koz
Inferred 628 kt Gold 6.6 g/t 134 koz
Total Resource 1,818 kt Gold 8.6 g/t 505 koz

Commodity Production Costs:

CommodityUnits2017201620152014
Credits (by-product) Gold AUD -4 / oz -3 / oz
All-in sustaining costs (AISC) Gold AUD 1,517 / oz† 1,229 / oz† 1,165 / oz† 1,044 / oz†
C1 cash costs Gold AUD 916 / oz† 665 / oz† 607 / oz† 522 / oz†
C2 total cash costs Gold AUD 1,718 / oz† 1,126 / oz† 1,003 / oz†
C3 fully allocated costs Gold AUD 1,809 / oz† 1,189 / oz† 1,086 / oz†
† Net of By-Product.

Operating Costs:

Units20172016
UG mining costs ($/t milled) AUD 115111
Processing costs ($/t milled) AUD  ......  Subscription required  ......  Subscription required
Total operating costs ($/t milled) AUD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units2017201620152014
Sustaining costs M AUD  ......  Subscription required  ......  Subscription required
Revenue M AUD  ......  Subscription required 133.7   110.3  
Pre-tax Income M AUD  ......  Subscription required


Heavy Mobile Equipment:

Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Annual Report 2016
Annual Report 2015
Annual Report 2014
Feasibility Study Report 2012
Press Release 2012
Other 2010
Subscription required - Subscription is required.

News:

NewsDate
Silver Lake divests Andy Well and Gnaweeda projects December 21, 2020

Aerial view:

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