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Zambia
Mopani Operation (Mufulira Mine, Nkana Mine)

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 Location:
0 km N from Mufulira, Zambia

  Address:
Nkana West, Corner of Central Street and 5th Avenue
PO Box 22000
Kitwe
Zambia
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Fax+260 2 247002
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Copper
  • Cobalt
Mining Method
  • Longitudinal Room-and-Pillar
  • Continuous
  • Sub-level caving
  • Vertical Crater Retreat
Processing
  • Pyrometallurgical plant / circuit
  • Sulfuric acid (reagent)
  • Smelting
  • Dewatering
  • Crush & Screen plant
  • Acid leach
  • Flotation
  • Counter current decantation (CCD)
  • Acid tank leaching
  • Electrorefining
  • Solvent Extraction & Electrowinning
Mine Life26 years (as of Jan 1, 2019)
Mopani Copper Mines are the Mufulira mine site (in Mufulira) and the Nkana mine site (in Kitwe).

The Mufulira site has an underground mine operation, a concentrator, a smelter, an acid plant and a copper refinery while the Nkana site has four underground mines, a concentrator, a new state-of-the-art concentrator and other associated operations.
Latest NewsGlencore plc.: Signed contract to sell underlying stake of 73% in Mopani in $1.5b transaction     January 19, 2021


Owners

Source: p. 3
CompanyInterestOwnership
Mopani Copper Mines plc. (operator) 100 % Direct
ZCCM Investments Holdings Plc. 100 % Indirect
31 March, 2021 - Glencore today announces that its subsidiary Carlisa Investments Corp., in which Glencore holds 81.2% of the shares, has completed the sale to ZCCM Investments Holdings plc of its 90% interest in Mopani Copper Mines plc.

ZCCM Investments Holdings Plc. is now the holder of 100% of the issued shares in Mopani Copper Mines plc.

Deposit Type

  • Stratabound (SMS)
  • Sediment-hosted


Summary:

Nkana
The predominant mega-structure of the mining area is the northwest-plunging Nkana syncline. This structure is asymmetric, with a curved axial plane inclined steeply to the northwest in the trough of the syncline but upright to westward dipping at higher structural levels. A complex occupies the axial zone of the syncline but this folding dies out on its flanks. As a result of the north-westerly plunge of the Nkana syncline, the present land surface represents a horizontal section through progressively higher structural levels of the syncline from southeast to northwest.

Within the Nkana mining area there are four underground mines and a series of open pits. The open pits are under care and maintenance and have therefore been excluded from Ore Reserves and included under Mineral Resources. All are situated on the north-eastern limb of the Nkana Syncline area. Other cupriferous zones are present in the nose and southwest limb of the syncline. The orebodies are stratiform and are mainly confined to a recognisable ore formation, which occurs near the base of the Katangan sequence within the Lower Roan Group of the Mine Series. In the underground workings, the principal copper ore minerals are chalcopyrite and bornite with subordinate chalcocite. There is a zoning in the geographical distribution of these minerals. Cobalt occurs as carrollite and cobaltiferious pyrite. The principal ore minerals are malachite, pseudomalchite, chrysocolla, native copper, cuprite and libethenite. In the open pit, malachite and chrysocolla are the principal ore minerals in the zone of oxidation closer to the surface. In some places however, vermiculite, malachite pseudomalachite and accessory wad are more important. At deeper levels chalcopyrite, bornite and chalcocite are predominantly present.

Mufulira
The rocks of the Mufulira Basin are asymmetrically folded, moderately dipping on the south western flank and sub vertical on the north eastern limb, outcropping at Mokambo on the DRC border. The Roan sediments in the Mufulira syncline in the vicinity of the mine dip at approximately 45º to the north east. Small folds and minor faults are present within the mine area. The Lower Roan arenaceous quartzites and greywackes are the host rocks to the copper mineralisation.

In the Mufulira mining area, the Basement Complex topography appears to have exerted a significant structural control during deformation. The distribution of ore minerals in all three orebodies is stratigraphically controlled, occurring dominantly as disseminations, blebs and irregular masses. The principal copper minerals are chalcopyrite (60%), bornite (40%), and minor/trace chalcocite. Oxide minerals are confined to near surface occurrences, and supergene enrichment zones. Generally the deposit is structurally simple being characterised by three main folds that are in part overturned with a plunge and dip approximately 10º to the northeast. The basin is open and untested at depth.


Mining Methods

  • Longitudinal Room-and-Pillar
  • Continuous
  • Sub-level caving
  • Vertical Crater Retreat


Summary:

Nkana.
The Nkana Mine produces copper and cobalt ore from four sources: North Shaft, Mindola Sub Vertical, Central Shaft and South Ore Body (“SOB”). In addition, Nkana was produced copper from open pits.

All the open pits are exhausted except “Area Nose” and area J, both of which were placed on care and maintenance in 2019. Open pits have therefore been excluded from Ore Reserves and included under Mineral Resources.

The underground mining operations are accessed by shafts namely Central, Mindola Sub-vertical (“SV”), SOB and Mindola North Shaft (“MNS”). Underground mining operations started in 1931 with the oldest operating shaft being Central Shaft. The mining methods used include Vertical Crater Retreat (“VCR”), Sub-Level Caving (“SLC”), and Longitudinal Room and Pillar (“RAP”).

Mufulira.
The mining methods employed at Mufulira Mine are variants of Mechanised Continuous Retreat (“MCR”). The variant mining methods are Mechanised Continuous Retreat 1 (“MCR1”) and Mechanised Continuous Retreat 2 (“MCR2”), employed at Mufulira West and Mufulira Central. RAP mining is employed at Mufulira East. Mining of the Mufulira ore bodies is divided into three areas:
* Mufulira East;
* Mufulira Central; and
* Mufulira West.
Mufulira Central is further sub divided into the Upper, Central and Deeps areas, based on elevation.

The change in the Mineral Resources at both Mufulira and Nkana from 2018 to 2019 is mostly due to mining depletion. Changes in Ore Reserves from 2018 to 2019 at Mufulira relate only to mining depletion, whilst changes at Nkana are due to mining depletion and placing of North Shaft and area Nose under care and maintenance.

Expansion projects (January, 2021):
-the Kitwe Synclinorium Shaft is 95 per cent complete with a shaft, ventilation shaft and a handling system already in place;
-the Mindola Sub-Vertical Shaft (MSV) is 30 per cent complete with only the shaft reaming done and all the requisite components are on site;
-the Mufulira Henderson Shaft is 70 per cent complete with the shaft ventilation in place together with a temporary ore handling system. All associated equipment is on site awaiting completion; and
-the Synclinorium Concentrator in Kitwe is 99 per cent complete and merely awaiting commissioning.

The new infrastructure and the rehabilitation of the old infrastructure will extend the life of the Mopani Copper Mines Plc by twenty to thirty-five years in addition to the increasing annual own resources of copper by about 40 per cent.


Crushing and Grinding


Processing

  • Pyrometallurgical plant / circuit
  • Sulfuric acid (reagent)
  • Smelting
  • Dewatering
  • Crush & Screen plant
  • Acid leach
  • Flotation
  • Counter current decantation (CCD)
  • Acid tank leaching
  • Electrorefining
  • Solvent Extraction & Electrowinning

Flow Sheet: Subscription required

Summary:

At Nkana Mopani operates a concentrator, Cobalt Plant and Leach plants. Conventional methods are employed in the concentrator namely; crushing, grinding, flotation and dewatering. Copper and cobalt concentrates are produced from a bulk concentrate by a segregation process. At Nkana, the concentrator operates in a conventional manner, and has a capacity of 12 000 mt per day. Primary stage crushing of ore is done underground while the secondary and tertiary stage crushing takes place at the concentrator. Ball mills grind the crushed ore for subsequent flotation to produce a copper concentrate grade of approximately 30%.

At Nkana the cobalt floats with the copper and then has to be separated out by a differential float using lime to alter the pH and sodium cyanide; this is not an exact process and as a result some of the copper remains within the cobalt stream which is recycled in the process and recovered later.

From 2000 onwards both sites (Nkana and Mufulira) in ........


Production:

CommodityProductUnits2020201920182017201620152014
Copper Metal kt  ......  Subscription required  ......  Subscription required59424192110
Copper Metal in concentrate kt  ......  Subscription required
Subscription required - Subscription is required.


Reserves at December 31, 2019:

CategoryTonnage CommodityGrade
Proven 110 Mt Copper 1.9 %
Probable 31 Mt Copper 1.85 %
Proven & Probable 141 Mt Copper 1.89 %
Measured 207 Mt Copper 2.08 %
Measured 207 Mt Cobalt 0.08 %
Indicated 76 Mt Copper 1.99 %
Indicated 76 Mt Cobalt 0.08 %
Measured & Indicated 283 Mt Copper 2.06 %
Measured & Indicated 283 Mt Cobalt 0.08 %
Inferred 76 Mt Copper 2.06 %
Inferred 76 Mt Cobalt 0.08 %

Financials:

Units20192018201720162015
After-tax Income M USD  ......  Subscription required-722.8   -290.1   -180   -285  


Heavy Mobile Equipment:

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Aug 19, 2021
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....................... 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
....................... Subscription required ....................... Subscription required Subscription required Aug 19, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 19, 2021
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2020

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Annual Report 2018
Other 2018
Year-end Mineral Reserves 2018
Annual Report 2017
Annual Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Year-end Mineral Reserves 2016
Annual Report 2015
Technical Report 2011
Subscription required - Subscription is required.

News:

NewsDate
Glencore plc.: Signed contract to sell underlying stake of 73% in Mopani in $1.5b transaction January 19, 2021
Zambia Sees Deal With Glencore Over Mopani Within a Month November 16, 2020

Aerial view:

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