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Australia
Gloster Mine (Duketon North Operation)

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 Location:
118 km NW from Laverton, Western Australia, Australia

  Regional Office:
Level 2
516 Hay Street
Subiaco
Western Australia, Australia
6008
Phone  ...  Subscription required
Fax+61-8-94-42-2290
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Crush & Screen plant
  • Gravity separation
  • Carbon in leach (CIL)
  • Cyanide (reagent)


Owners

Source: p. 117
CompanyInterestOwnership
Regis Resources Ltd. 100 % Direct
The Gloster deposit is located on the recently granted tenement M38/1268, an area of 905.29ha. Current registered holder of the tenement is Regis Resources Limited.

Deposit Type

  • Vein / narrow vein
  • Intrusion related


Summary:

The Gloster gold deposit is hosted in an oxidised quartz diorite intrusive unit intruding a sequence of felsic to intermediate volcaniclastic units. The majority of the gold mineralisation is hosted in a sequence of flat 30° to 40° northeast dipping narrow quartz veins and fractures that are best developed within the more brittle quartz diorite intrusive unit. The quartz veins are stacked and extend from the surface to at least 100m depth. Weathering extends to a vertical depth of up to 100m. Within the weathered profile gold mineralisation has been localised by supergene enrichment processes and may not necessarily be closely associated with the quartz veins.

In the fresh rock zone the gold is typically associated with quartz-carbonate-sericite- chloritepyrite mineralisation. A zone of gold depletion occurs in the top 20m of the regolith above the gold resource which includes a 5m- thick zone of transported alluvium and colluvium. White and red to brown clays dominate the upper oxidised profile down to the base of complete oxidation.

Gold mineralisation at Gloster is within a NW-SE trending, NE dipping shear zone and associated with flat to moderately NE dipping quartz veins hosted in intermediate intrusives. A 5m transported cover sequence conceals the gold mineralisation and weathering extends up to 100m depth. Intensive gold leaching has occurred in the uppermost 15m of the weathering profile.

The approximate dimensions of the deposit are 1,200m along strike (NNW-SSE), 500m across (ENE-WSW), and 250m below surface.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The mining method assumed in the Ore Reserve study is the same as that currently employed at the Gloster Gold Mine, which utilises drill and blast, excavator and truck open pit mining. The existing pit has been designed to be developed in a series of progressive cutbacks.

Geotechnical and hydrogeological recommendations have been applied during pit optimisation and incorporated in design with ongoing reviews. Mining dilution and ore loss factors have been dealt with in the estimation of the OK Mineral Resource. This is considered consistent with the current reconciliation to production, the style of estimation and experience from Regis’ other Duketon operations which use the same estimation approach, and is consistent with the suitability of earthmoving equipment to the orebody type (moderate grade and wide mineralised zones).


Crushing and Grinding


Processing

  • Crush & Screen plant
  • Gravity separation
  • Carbon in leach (CIL)
  • Cyanide (reagent)

Source: Subscription required

Summary:

The existing Moolart Well CIL Processing facility will be utilised to treat the Ore Reserve and a recovery factor of 93% has been assumed in the estimation of the Ore Reserve.

Full feasibility level metallurgical testwork was completed on the original Gloster Mineral Resource. Metallurgical performance of the Gloster ore through the Moolart Well processing facility validates the chosen recovery factor for the Ore Reserve estimation.

The Gloster Gold Mine is a fully operational open pit mining operation. This Ore Reserve has been investigated based on being satellite ore feed for the Moolart Well processing plant. The processing parameters are based on actual costs of the existing Moolart Well processing plant and reagent consumption.


Combined production numbers are reported under Duketon North Operation


Reserves at December 31, 2020:
Resources are reported at cut-off grade of 0.1 g/t Au.

CategoryTonnage CommodityGradeContained Metal
Measured Mt Gold 0.7 g/t 10 koz
Indicated 8 Mt Gold 0.8 g/t 190 koz
Inferred 8 Mt Gold 0.8 g/t 190 koz
Total Resource 16 Mt Gold 0.8 g/t 390 koz


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 19, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 19, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 19, 2021
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
Year-end Mineral Reserves 2018
Annual Report 2017
Annual Report 2016
Year-end Mineral Reserves 2016
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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