Overview
Status | Care and Maintenance |
Mine Type | Underground |
Commodities |
|
Mining Method |
|
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 News | Silver Lake divests Andy Well and Gnaweeda projects December 21, 2020 |
Source:
p. 6
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.
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.
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.
Crusher / Mill Type | Model | Size | Power | Quantity |
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:
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:
Commodity | Parameter | 2017 | 2016 | 2015 | 2014 |
Gold
|
Recovery Rate, %
| ......  | ......  | ......  | ......  |
Gold
|
Head Grade, g/t
| 5.1 | 8 | 9.15 | 10.8 |
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Production:
Commodity | Units | 2017 | 2016 | 2015 | 2014 |
Gold
|
oz
| 52,924 | 84,135 | 88,736 | 76,785 |
Operational Metrics:
Metrics | 2017 | 2016 | 2015 | 2014 |
Ore tonnes mined
| ......  | 323,949 t | 394,728 t | 233,549 t |
Tonnes processed
| ......  | 337,443 t | 309,542 t | 225,433 t |
Reserves at June 30, 2019:
Category | Tonnage | Commodity | Grade | Contained 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:
| Commodity | Units | 2017 | 2016 | 2015 | 2014 |
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:
| Units | 2017 | 2016 |
UG mining costs ($/t milled)
|
AUD
| 115 | 111 |
Processing costs ($/t milled)
|
AUD
| ......  | ......  |
Total operating costs ($/t milled)
|
AUD
| ......  | ......  |
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Financials:
| Units | 2017 | 2016 | 2015 | 2014 |
Sustaining costs
|
M AUD
| ......  | ......  |
|
|
Revenue
|
M AUD
| ......  | |
133.7
|
110.3
|
Pre-tax Income
|
M AUD
| ......  | |
|
|
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