Overview
Stage | Feasibility |
Mine Type | Open Pit / Underground |
Commodities |
|
Mining Method |
|
Processing |
- Gravity separation
- Carbon in leach (CIL)
- Solvent Extraction & Electrowinning
|
Mine Life | 4 years (as of Jan 1, 2013) |
Summary:
Regionally the project lies in the southern Gascoyne Province adjacent to the northwest margin of the Yilgarn Craton. Geologically the province has been described as the high-grade metamorphic core zone of the Early Proterozoic Capricorn Orogen. The region comprises granitoid intrusions, gneiss domes, metamorphosed sedimentary rocks and remobilised Archaean basement gneiss.
The project overlies an east-north-east trending sequence of highly metamorphosed Lower Proterozoic rocks comprising variably quartz feldspar-biotite-garnet-magnetite gneiss, amphibolite, quartzite and calc-silicate. A prominent crustal scale north-east trending fault, the Deadman Fault, bisects the project area.
Gold mineralisation at Glenburgh was first detected by Helix Resources in 1994 from gold anomalism in regional stream sediment sampling and subsequent soil sampling which outlined a 20km long anomalous trend. Drilling principally by Helix and since 2010, Gascoyne Resources has discovered and extended a series of gold deposits with JORC Resources. Gold mineralisation at Glenburgh is somewhat enigmatic as a result of the high grade metamorphic host rocks; gold occurs in quartz- feldspar- biotite-garnet gneiss with a general observation of higher grades occurring in silica “flooded” zones.
Summary:
Upon completion of the Glenburgh mining study, Kenmore Mine Consulting completed a number of conceptual mine schedules (for both open cut and underground). The aim of the schedules was to complete the mining in the most productive manner possible, while allowing selective ore blending strategies. The selected schedule allows for two excavators mining the open pits for approximately two years, then one excavator for the next year, while the underground is developed and mined in two years commencing in month 27 of the schedule.
In addition to the open cut optimisations and resulting mine designs, a conceptual underground development has also been designed for the high grade zones below the Zone 126 open pit. An underground mine design has been completed that results in an underground mining inventory of 426,000t @ 4.6 g/t. This adds significantly to the overall project mining inventory, in the final two years of processing.
Processing
- Gravity separation
- Carbon in leach (CIL)
- Solvent Extraction & Electrowinning
Source:
Summary:
The Study was completed by a number of independent consultants and investigated several options, based around a carbon in leach (CIL) treatment facility, processing approximately 1.2mtpa. The project includes a number of conceptual mill feed sources including eleven open pits at Glenburgh, a high grade open pit at the Egerton project (currently under option) and an underground development at the Zone 126 deposit at Glenburgh.
The metallurgical testwork showed that a relatively simple flowsheet can be adopted for the project. As a result, a number of second hand processing facilities are suitable for the project. While the company is yet to secure an option over a suitable facility, there are a number in Western Australia that are “fit for purpose” and the company is investigating a number of options.
Recoveries & Grades:
Commodity | Parameter | Avg. LOM |
Gold
|
Recovery Rate, %
| 94.5 |
Gold
|
Head Grade, g/t
| 2 |
Projected Production:
Commodity | Units | LOM |
Gold
|
oz
| 316,000 |
Operational Metrics:
Metrics | |
Ore tonnes mined
| 4.9 Mt * |
Stripping / waste ratio
| 8.1 * |
Annual processing rate
| 1.2 Mt * |
* According to 2013 study.
Reserves at December 31, 2013:
Category | Tonnage | Commodity | Grade | Contained Metal |
Measured
|
32,100 t
|
Gold
|
9.5 g/t
|
9,800 oz
|
Indicated
|
6.95 Mt
|
Gold
|
1.75 g/t
|
390,000 oz
|
Inferred
|
14.2 Mt
|
Gold
|
1.35 g/t
|
620,000 oz
|
Operating Costs:
| Units | 2013 |
Total operating costs ($/t milled)
|
AUD
| 29.2 * |
* According to 2013 study.
2013 Study Costs and Valuation Metrics :
Metrics | Units | LOM Total |
Pre-Production capital costs
|
$M AUD
|
......
|
Initial CapEx
|
$M AUD
|
......
|
Sustaining CapEx
|
$M AUD
|
......
|
Total CapEx
|
$M AUD
|
......
|
Net revenue (LOM)
|
$M AUD
|
......
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Mine Management:
Job Title | Name | Profile | Ref. Date |
.......................
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Jul 23, 2020
|
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