• Data Access
  • Your Email  
  • Your Email  
Keep me signed in.
Forgot your password?
Close
  • Forgot Your Password?
  • Enter the email you signed up with and we'll email it to you.
  • Your Email  
Close
Back
MDO
Mining Data Solutions
  • Home
  • Database
  • Subscribe
  • Sign In
  • Sign In
Australia
Abra Project

This page is not tailored to
devices with screen width under 750 px.
 Location:
178 km SW from Newman, Western Australia, Australia

  Project Contacts:
Ground Floor, 1 Centro Avenue
PO Box 8187 Subiaco East
Subiaco
Western Australia, Australia
6008
Phone  ...  Subscription required
EmailEmail
WebsiteWeb
Additional Resources for Suppliers & Investors
Drill results over 30 g/t Au
Stay on top of recent discoveries.
Search drill results by commodity and grade.
Largest mines in the Americas
Mining and mill throughput capaciites.
Full profiles of select mines and projects.
Deepest underground mines
Shaft depth and mill throughput data.
Full profiles of select mines and projects.
Heavy mobile equipment
HME type, model, size and quantity.
Full profiles of select mines and projects.
Permitting and construction projects
Projects at the permitting or construction stage. Full profiles of select projects.
Mines with remote camps
Camp size, mine location and contacts.
Full profiles of select mines and projects.
Mines & projects in Australia
A list of country's mines and projects.
Full profiles of select mines and projects.
  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

Thank you for browsing through mine profiles compiled by the Mining Data Online team.

Would you like to subcribe or schedule a Demo?
  • Name:
     
  • Company:
     
  • Position:
     
  • Phone:
  • Email:
  • Message:

Overview

StageConstruction
Mine TypeUnderground
Commodities
  • Lead
  • Silver
Mining Method
  • Longhole open stoping
  • Room-and-pillar
  • Paste backfill
Processing
  • Flotation
Mine Life16 years (as of Jan 1, 2019)
The Abra base metals deposit (Pb-Ag-Cu-Au) is one of the largest, undeveloped lead deposits in the world.
Latest NewsGalena nears underground mining at Abra     July 8, 2020


Owners & OPERATOR

Source: p. 5
CompanyInterestOwnership
Galena Mining Ltd. 86.16 % Indirect
Abra Mining Pty Ltd. (operator) 100 % Direct
Toho will inject a further A$70M into AMPL prior to construction of the Project, resulting in AMPL being owned 60% by Galena and 40% by Toho.

Deposit Type

  • Vein / narrow vein
  • Sediment-hosted
  • Replacement


Summary:

Abra is a world class base metals deposit with a globally significant resource of lead-silver which transitions into gold- copper rich mineralisation at depth.

The Abra deposit lies within sediments of the Proterozoic Edmund Group. Abra is a base metal replacement-style deposit hosted by sediments. The primary economic metal is lead. Silver, copper, zinc and gold are also present but are of much lower tenor.

The deposit can be divided into two main parts. The upper “Apron” zone comprises strataform massive and disseminated lead- sulphides (galena) and minor copper sulphides (chalcopyrite) within a highly altered sequence of clastic and dolomitic sediments. Alteration products include jasperlitic rich sediments (the “Red Zone”) and a distinctive stratiform zone of hematatite-magnetite alteration (the “Black Zone”. The Apron zone extends for 1,000m along strike, 700m down dip and dips gently south.

The “Core” zone underlies the Apron and comprises an elongate funnel shaped body of hydrothermal breccias, veining and intense alteration overprinting gently south dipping sediments. The veining and breccia zones in the Core typically dip steeply to the north. High grade lead sulphide mineralisation is predominantly hosted in intensely veined zones. High grade zinc sulphide mineralisation (sphalerite) is found in the central parts of the Core. Copper (chalcopyrite) and gold mineralisation is sporadically found throughout the upper parts of the Core zone but forms coherent body at the base of Core. The core zones extends from 300 to 750m below surface and can be traced for 400m along strike.


Mining Methods

  • Longhole open stoping
  • Room-and-pillar
  • Paste backfill


Summary:

Underground mining using long-hole open stoping has been selected as the primary mining method, with paste backfill. However, certain shallow dipping areas within the Apron Zone will be mined as room and pillar. Ground conditions are expected to allow relatively large stopes to be employed.

Using available geotechnical data, an overbreak of less than 0.5 metres was estimated and a dilution of such was applied to all hangingwall stopes. The grade of dilution hangingwall material for stope shapes was also estimated (Apron Zone hangingwall dilution grade 4.8% lead and Core Zone hangingwall dilution grade 4.2% lead). This confirmed the mining grade factors considering the reasonable grade of dilution material. Pillars were not designed but an allowance for Ore loss in pillars was included in the stope recovery factor. Consequently, a range of stope recoveries were applied for different mining methods. These range from 75% in the room and pillar areas, up to 95% for long-hole open stoping areas, where no pillars are planned. Based on this, the Ore Reserve estimate assumes an average overall stope recovery of 85%. Given the relatively high grade of dilution hangingwall material, an overall mining dilution factor of 5% was applied. Minimum mining width was assumed to be 5 metres.


Crushing and Grinding


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

The selected process flowsheet has been designed to produce a single high-value, high-grade lead- silver concentrate at maximum recovery. The plant flowsheet contains the following processing stages for the production of leadsilver concentrate:

- Three stage crushing with fine ore bin storage and emergency stockpile with feeder;

- Single stage ball mill with a flash flotation cell treating cyclone underflow;

- Flotation and concentrate regrind to produce a lead/silver concentrate;

- Concentrate dewatering utilising a thickener and a filter to produce a transportable concentrate; and

- Tailings thickening and storage in a designated facility.

Grade recovery modelling of flotation data indicates that the Abra process plant will recover 93.0 to 94.7% of the lead, producing a lead concentrate expected to contain 73% to 75% lead and approximately 200 g/t silver.

Recoveries & Grades:

CommodityParameterAvg. LOM
Lead Recovery Rate, %  ......  Subscription required
Lead Head Grade, % 81
Lead Concentrate Grade, %  ......  Subscription required
Silver Recovery Rate, %  ......  Subscription required
Silver Head Grade, g/t 20.2
Silver Concentrate Grade, g/t  ......  Subscription required
Subscription required - Subscription is required.

Projected Production:

CommodityUnitsAvg. AnnualLOM
Lead M lbs 2092,734
Silver koz  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate.

Operational Metrics:

Metrics
Tonnes milled, LOM  ......  Subscription required
Annual milling capacity  ......  Subscription required
* According to 2019 study.
Subscription required - Subscription is required.

Reserves at December 18, 2018:

CategoryTonnage CommodityGrade
Probable 10.3 Mt Lead 8.8 %
Probable 10.3 Mt Silver 24 g/t
Indicated 15 Mt Lead 8.7 %
Indicated 15 Mt Silver 22 g/t
Inferred 22.4 Mt Lead 6.7 %
Inferred 22.4 Mt Silver 15 g/t
Total Resource 37.4 Mt Lead 7.5 %
Total Resource 37.4 Mt Silver 18 g/t

Commodity Production Costs:

CommodityUnitsAverage
Credits (by-product) Lead USD  ......  Subscription required *
C1 cash costs Lead USD  ......  Subscription required *†
Assumed price Lead USD  ......  Subscription required *
Assumed price Silver USD  ......  Subscription required *
* According to 2019 study / presentation.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2019
Processing costs ($/t milled) AUD 24.3 *
Total operating costs ($/t milled) AUD  ......  Subscription required
* According to 2019 study.
Subscription required - Subscription is required.

2019 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Pre-Production capital costs $M AUD  ......  Subscription required
Total CapEx $M AUD  ......  Subscription required
Royalty payments $M AUD  ......  Subscription required
Gross revenue (LOM) $M AUD  ......  Subscription required
Pre-tax Cash Flow (LOM) $M AUD  ......  Subscription required
Pre-tax NPV @ 8% $M AUD  ......  Subscription required
After-tax NPV @ 8% $M AUD  ......  Subscription required
Pre-tax IRR, %  ......  Subscription required
After-tax IRR, %  ......  Subscription required
Pre-tax payback period, years  ......  Subscription required
Subscription required - Subscription is required.

Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jun 26, 2020
....................... Subscription required ....................... Subscription required Subscription required Jun 26, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
Subscription required - Subscription is required.

News:

NewsDate
Galena nears underground mining at Abra July 8, 2020
GR Engineering wins Abra contract with Galena February 10, 2020
Galena Mining: Construction starts at Abra October 4, 2019
Galena boosts Abra production and mine life forecast July 22, 2019
Galena advances $90m Abra project JV with Toho Zinc April 12, 2019
Galena retains GR Engineering for Abra DFS October 11, 2018
Galena’s Abra project forecast to be a top global lead mine July 4, 2018

Aerial view:

Subscription required - Subscription is required.

Terms of Use Privacy Policy © 2020 MDO Data Online Inc.