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Eritrea
Bisha Mine

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 Location:
40 km W from Akordat, Eritrea
  Address:
61, Mariam Gimby PO Box 4276
Asmara
Eritrea
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News
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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Copper
  • Zinc
  • Silver
Mining Method
  • Truck & Shovel / Loader
Production Start...
Mine Life6 years (as of Jan 1, 2021)

Owners

Source: p. 5,343
CompanyInterestOwnership
Eritrean National Mining Corp. 45 % Indirect
Zijin Mining Group Co., Ltd 55 % Indirect
The Company ultimately owns 55% equity interest in Bisha through Nevsun Eritrea, while Eritrean National Mining Corporation owns 45% equity interest in BMSC.

Contractors

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Deposit Type

  • VMS

Summary:

The Bisha and Harena are large precious- and base metal-rich VMS deposits; Northwest, Hambok and Asheli are small to medium size VMS deposits.

The Property is underlain by Neoproterozoic upper green schist to lower amphibolite facies volcanics and sedimentary units of the Augaro Adobha Belt.

The Bisha Main deposit is a series of four massive sulphide lenses that occur over a 1.2 km north-south trending strike extent. The thickness of the lenses is variable up to 70 m. Mineralisation extends to a depth of 600 m below surface.

The massive sulphide bodies comprise a southern zone and a northern zone. The main part of the southern zone strikes approximately 345° and dips steeply to the west, with strike and dip lengths of some 600 m and 500 m respectively. The main part of the northern zone strikes approximately 0° and dips steeply to the west, with strike and dip lengths of some 500 m and 100 m respectively. The southern zone plunges 45° to the south. In the hanging walls of both the southern and northern zones, there are two smaller massive sulphide pods interpreted to be folded limbs of the two main zones.

The Gossan varies in composition from highly siliceous and ferruginous to massive goethite– hematite–jarosite. The Oxide Zone is up to 50 m deep and is composed of hematite, quartz and clays; in places, original rock textures are preserved. The Oxide zone is enriched in Au, Pb, Ba and Mo and depleted in Cu, Zn, Cd and Co.

Mining Methods

  • Truck & Shovel / Loader

Summary:

The Bisha Main and Harena deposits are mined as a conventional open pit operation. At Bisha Main, most of the in-pit haulage for waste will be carried out using 65-tonne haulage trucks and 10 m3 excavators, in 5 m benches. To control mining dilution and to increase selectivity smaller excavators will be utilised for ore mining. Harena pit will be mined using the same mining fleet and also in 5 m benches.

Waste rock will be moved and hauled to multiple rock storage facilities based on their geochemical characteristics and period of operation. Some of the mineralised waste will be stockpiled near the pit so that it can be recovered if commodity prices increase from current levels.

Mine design criteria:
- Bench height (final wall) - 10 m. Ore and waste will be mined in 5.0 m working benches.
- Bench face angle - 63°, 67°, 70°. Mainly 70°.
- Catch bench width - 6 m to 8.3 m. Varies based on the geotechnical zone, on final walls.
- Geotechnical berm - 16 m. At 140 m vertical intervals.
- Inter-Ramp angle - 39° to 46°. Varies by zone.
- Haulage road width - 32.5 m. Two way roads, includes berm and ditch.
- Maximum road slope 10%.
- Rock dump face angle - 34°. 25 m lifts and overall slope of 26°.

The Bisha Main ultimate pit is oriented in south-north direction. It broadly consists of two adjoining sections, a smaller pit in the north and the main pit to the south. The pit is ~1,400 m long (south to north) and ........

Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.

Production:

CommodityUnits2022202120202019201820172016
Copper M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required371856
Zinc M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver koz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold oz  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in concentrate. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202120202019201820172016
Annual mining capacity  ......  Subscription required  ......  Subscription required22 Mt
Annual processing capacity  ......  Subscription required  ......  Subscription required2.4 Mt2.4 Mt
Ore tonnes mined  ......  Subscription required  ......  Subscription required2,050,000 t3,643,000 t
Waste  ......  Subscription required  ......  Subscription required15,960,000 t9,367,000 t
Stripping / waste ratio  ......  Subscription required  ......  Subscription required7.8 2.6
Tonnes processed  ......  Subscription required  ......  Subscription required2,233,000 t2,278,000 t
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Reserves at December 31, 2021:
NSR is the value of ore per tonne after deduction of refining costs, mining areas with different resources based on USD31/tonne, USD32/tonne, USD33/ tonne, USD34/tonne, USD100/tonne; Mining areas with different reserves based on USD42.24/tonne, USD42.56/ tonne, USD42.92/tonne, USD43.22/ tonne USD44.32/tonne, USD44.63/tonne

CategoryTonnage CommodityGradeContained Metal
Proven & Probable t Copper 0.87 % 131 kt
Proven & Probable t Zinc 4.24 % 636 kt
Total Resource t Copper 0.96 % 818.3 kt
Total Resource t Zinc 3.82 % 3,134 kt

Commodity Production Costs:

CommodityUnits20172016
C1 cash costs Zinc USD 0.97 / lb  
C1 cash costs Copper USD 1.72 / lb   1.04 / lb  
C1 cash costs Zinc USD 0.88 / lb†  
† Net of By-Product.

Financials:

Units202120202019201820172016
Sustaining costs M USD 26.1  
Capital expenditures M USD 37.4   90.1  
Operating Income M  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gross profit M 12.6  USD
After-tax Income M  ......  Subscription required  ......  Subscription required  ......  Subscription required
Operating Cash Flow M  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required

Heavy Mobile Equipment as of December 31, 2016:
HME TypeModelSizeQuantity
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (crawler) ....................... Subscription required ....................... Subscription required
Dozer (rubber tire) ....................... Subscription required 4.633 m blade width ....................... Subscription required
Drill ....................... Subscription required 229 mm ....................... Subscription required
Drill ....................... Subscription required 150 mm ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required 4.677 m blade width ....................... Subscription required
Grader ....................... Subscription required 4.267 m blade width ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Truck (haul) 65 t ....................... Subscription required
Truck (water) 56781 l ....................... Subscription required
Truck (water) 30283 l ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 18, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 18, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 18, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 18, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 18, 2022
....................... Subscription required ....................... Subscription required Subscription required Jul 18, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2020
Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Information Form 2017
Management Discussion & Analysis 2017
Annual Information Form 2016
Management Discussion & Analysis 2016
Technical Report 2016
Subscription required - Subscription is required.

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