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Australia
Portia Mine

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 Location:
90 km NW from Cockburn, South Australia, Australia

  Regional Office:
PO Box 5079
Broken Hill
New South Wales, Australia
2880
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeOpen Pit
Commodities
  • Gold
  • Copper
  • Molybdenum
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life1.5 years (as of Jan 1, 2016)
At Portia, the first gold ore was mined during March 2016, with the first gold pour occurring in May 2016.

Originally the Portia Mine Site was anticipated to have approximately twelve months of overburden removal followed by approximately six months of mining and processing of the gold bearing materials, giving an expected life of mine (LoM) of approximately eighteen months total. Based on subsequent positive drilling results, approval was given to expand the original Portia open pit design to include extensions to the north and south. Majority of the north and south extensions were completed by mid-2018, subsequently in August 2018, the Porta Mine Site was placed in a phase of care and maintenance.

Benagerie Gold & Copper Pty Ltd (BGC) announced that the Portia pit is being placed on care and maintenance for a period of time until an updated PEPR (Program for Environmental Protection and Rehabilitation) for the Benagerie ML had been approved.


Owners

Source: p. 16,18
CompanyInterestOwnership
Consolidated Mining and Civil 100 % Indirect
Benagerie Gold and Copper Pty Ltd. 100 % Direct
Benagerie Gold and Copper Pty Ltd (BGC) is the current owner of the Portia Mine Site.

In June 2018, Havilah Resources announced that it would sell Benagerie Gold, to its mining partner, Consolidated Mining and Civil (CMC), wholly owned by Consolidated Broken Hill Holdings (CBHH). The sale of Benagerie Gold and Copper Pty Ltd. (formerly Benagerie Gold) to CBHH was completed in April 2019.

Contractors

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Deposit Type

  • Sedimentary
  • Vein / narrow vein


Summary:

The Portia (gold) Deposit occurs at the base of the Eyre Formation (of Tertiary age) and immediately above a weathered basement profile of pyritic albitite, graphitic pelite, quartz albitite, and another pelite unit, all of which dip at about 40 degrees.

The gold occurs as granular aggregates sitting in a deflation surface that has formed a slight depression in the basement topography. Weathering occurs for many tens of metres below the Tertiary - basement contact in the pyritic albitite but is less deep in the graphitic pelite, quartz albitite and other pelite unit. The base of the oxidised zone also occurs significantly shallower in the pyritic albitite.

The Eyre Formation is overlain by clayey sediments of the Namba Formation, which extends from surface to about 70 metres. The following cross section shows the base of Namba Formation, base of Eyre Formation, the base of the Tertiary gold horizon, dipping basement units, the base of the oxidised zone, and the base of the weathered zone.

The Portia and North Portia prospects are overlain by about 50-75 m of Quaternary and Tertiary sediments. The Proterozoic host and footwall rocks are intensely albitized and oxidized (hematite- and magnetitebearing). Prior to albitization, the host rocks were finely laminated carbonaceous shales and evaporite- and carbonate-rich beds of saline silt and shale (Teale, 1999). The hanging wall is carbonaceous phyllite intercalated with albite- and muscovite rich ........


Mining Methods

  • Truck & Shovel / Loader


Summary:

At Portia, the first gold ore was mined during March 2016, with the first gold pour occurring in May 2016.

The Portia open pit is 110m deep, 750 m long and 500 m wide. Details of the wall angles, bench heights and berm widths are described in Table 3-10. Details of the full assessments can be found in Appendix B9. Access to the Portia pit is via two access ramps. The north access ramp width is approximately 20 m, whilst the south ramp width is 16 m.

Mining operation utilizes conventional open cut mining methods using a truck and excavator fleet supported by ancillary equipment.

Originally the Portia Mine Site was anticipated to have approximately twelve months of overburden removal followed by approximately six months of mining and processing of the gold bearing materials, giving an expected life of mine (LoM) of approximately eighteen months total. Based on subsequent positive drilling results, approval was given to expand the original Portia open pit design to include extensions to the north and south. Majority of the north and south extensions were completed by mid-2018, subsequently in August 2018, the Porta Mine Site was placed in a phase of care and maintenance.

Benagerie Gold & Copper Pty Ltd (BGC) announced that the Portia pit is being placed on care and maintenance for a period of time until an updated PEPR (Program for Environmental Protection and Rehabilitation) for the Benagerie ML had been approved.

BGC plan ........


Crushing and Grinding


Processing

Flow Sheet: Subscription required

Summary:

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Production:
Results to 11 July 2018 (Divestment of Benagerie ML, which included the Portia Gold Mine).

CommodityUnits201820172016
Gold oz 8,62619,3144,962
All production numbers are expressed as metal in doré.
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Operational Metrics:

Metrics201820172016
Ore tonnes mined 203,000 t341,000 t164,000 t
Waste 567,000 bcm3,886,000 bcm5,206,000 bcm
Tonnes processed 339,000 wmt340,000 wmt32,000 wmt

Reserves at March 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Inferred 720,000 t Gold 2.9 g/t 67,000 oz

Commodity Production Costs:

CommodityUnits20172016
All-in sustaining costs (AISC) Gold AUD 880 / oz†   585 / oz†  
C1 cash costs Gold AUD 640 / oz†   374 / oz†  
All-in costs Gold AUD 1,300 / oz†   628 / oz†  
† Net of By-Product.

Financials:

Units20172016
Capital expenditures M AUD 17.5   16.5  
Revenue M AUD 33.7   5.5  
Gross profit M AUD 9.8   2.7  
Pre-tax Income M AUD -3.3   -2.7  
After-tax Income M AUD -8.5   2.4  
EBITDA M AUD 5.1   -0.6  



Heavy Mobile Equipment as of November 1, 2015:
HME TypeModelSizeQuantityLeased or
Contractor
Dozer ....................... Subscription required t ....................... Subscription required Leased
Excavator 250 t ....................... Subscription required Leased
Excavator 120 t ....................... Subscription required Leased
Truck (dump) 100 t ....................... Subscription required Leased
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
Quarterly Report 2018
Annual Report 2017
Annual Report 2016
Corporate Presentation 2016
Corporate Presentation 2015
Technical Report 2014
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