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Zimbabwe
Blanket Mine

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 Location:
14 km NW from Gwanda, Zimbabwe

  Regional Office:
4th Floor, No. 1, Quadrum Office Park Constantia Boulevard Floracliffe
Johannesburg
South Africa
1725
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Underhand stoping
  • Longhole open stoping
Production Start...
Mine Life7 years (as of Jan 1, 2020)
Latest NewsCaledonia Mining Corporation Plc: Mineral Resources and Reserves Update at the Blanket Mine     February 6, 2023


Owners

Source: p. 3
CompanyInterestOwnership
Caledonia Mining Corporation plc 64 % Indirect
Blanket Mine (1983) (Private) Ltd. (operator) 100 % Direct
Ownership Tree
Caledonia’s primary asset is a 64% ownership in Blanket Mine, a gold mine in Zimbabwe.

The Blanket Mine operates under a mining lease ML40 issued to Blanket Mine (1983) (Pvt) Ltd, which is incorporated in Zimbabwe and a 64% owned, indirect subsidiary of Caledonia Mining Corporation Plc.

Contractors

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Deposit Type

  • Hydrothermal
  • Replacement


Summary:

DEPOSIT TYPES
The Blanket orebodies comprise up to 10% of precious metals. The Blanket mineralisation is hydrothermally emplaced and associated with the regionally developed D2 deformation characterised by areas of high strain wrapping around relatively undeformed remnants of the original basaltic flows. Wider orebodies occur within the more ductile tensional high strain areas. Two main types of mineralisation are recognised at Blanket, namely Disseminated Sulphide Reefs (DSR) and quartz-filled reefs and shears. A third type of mineralisation may be evidenced in the form of auriferous sulphide minerals as a replacement of the iron-rich minerals along the hinges of the folds in BIF.

MINERALISATION
Mining at Blanket occurs over a 3 km strike that includes from north to south, the deposits of Lima, Eroica, Sheet, AR Main, AR South, Feudal, Blanket Section (Blanket 1 to Blanket 6) and Jethro. The main Blanket underground workings are connected to Lima by a 2 km long haulage which follows the strike of the main fabric.

Wall rock alteration typically comprises silica-pyrite-muscovite within a broader carbonate alteration halo. Quartz-carbonate altered rock forms the most commonly recognised alteration assemblage. Gold is deposited at crustal levels within and near the brittle-ductile transition zone at:-
• depths of between 6 km and 12 km;
• pressures between 1 and 3 kilobars; and
• temperatures between 200ºC and 400ºC.

The ........


Mining Methods

  • Underhand stoping
  • Longhole open stoping


Summary:

Blanket Mine uses two mining methods which are well suited to the nature of the greenstone belt deposits. The orebodies range from generally steeply dipping sheet-like deposits of a few meters in width, to pipeshaped and massive deposits with widths more than 50 m. The general practice on Blanket Mine is to implement one of two tailored mining methods, determined mainly by the width of the mineral deposit.

The two mining methods utilised are:-
• Long-hole stoping in wider mineral deposits (orebody widths generally more than 3 m); and
• Underhand stoping in narrow mineral deposits (orebody widths generally less than 3 m).

LONG-HOLE STOPING
Blanket mine uses long-hole stoping in the orebodies with a width greater than 3 m.

To access the orebody, crosscuts are developed from the tramming haulage to the extraction haulage which is located approximately 15 m from the orebody. Drawpoint crosscuts are developed at 15 m intervals along the extraction haulage which provide access to the drawpoints. A twin raise system is developed upwards to establish a sliping point for the development of the sub-drive. One raise serves as an access raise, while the other serves as an orepass to handle ore from the sub-drive development. The twin raise system is developed from one sub-drive to the next for the entire 120 m lift.

Drawpoint raises are established at 15 m intervals along the width of the orebody. A lead angle of 45 degrees is al ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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Production:

CommodityUnits2022202120202019201820172016
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required54,51156,13350,351
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
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Operational Metrics:

Metrics202120202019201820172016
Tonnes milled  ......  Subscription required  ......  Subscription required556,331 t560,913 t547,207 t510,661 t
Daily milling capacity  ......  Subscription required  ......  Subscription required3,800 t
Daily ore mining rate  ......  Subscription required  ......  Subscription required1,200 t
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Reserves at December 31, 2021:
Mineral Resources cut-off of 1.5g/t applied.

Mineral Reserves cut-off of 2.1g/t applied.

CategoryTonnage CommodityGradeContained Metal
Proven 656 kt Gold 3.11 g/t 65,651 oz
Probable 1,751 kt Gold 3.3 g/t 185,652 oz
Proven & Probable 2,407 kt Gold 3.25 g/t 251,303 oz
Measured 553,949 t Gold 2.8 g/t 48,447 oz
Indicated 1,585,001 t Gold 2.78 g/t 141,757 oz
Measured & Indicated 2,138,950 t Gold 2.77 g/t 190,203 oz
Inferred 5,418,826 t Gold 3.17 g/t 552,450 oz

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Cash costs (sold) Gold USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required  ......  Subscription required 690 / oz   633 / oz   636 / oz  
All-in sustaining costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 802 / oz†   847 / oz†   912 / oz†  
All-in costs Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,128 / oz†   1,162 / oz†   1,221 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
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Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 19.9   20.9   19.1  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 68.4   69.8   62  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 21.4   20.6   19  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 21.6   26.3   23.5  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 21.2   20.6   18.8  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 13.8   11.9   11.1  
EBITDA M USD
Operating Cash Flow M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 17.7   24.5   23  
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Heavy Mobile Equipment as of December 31, 2021:
HME TypeQuantityStatus
Load-Haul-Dump (LHD) ....................... Subscription required Existing
Rockbreaker ....................... Subscription required Existing
....................... Subscription required ....................... Subscription required Proposed
Truck (dump) ....................... Subscription required Existing
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Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Sep 19, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 19, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 19, 2022
....................... Subscription required ....................... Subscription required Subscription required Sep 19, 2022
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Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Management Discussion & Analysis 2018
Press Release 2018
Technical Report 2018
Management Discussion & Analysis 2017
Corporate Presentation 2016
Management Discussion & Analysis 2016
Technical Report 2015
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News:

NewsDate
Caledonia Mining Corporation Plc: Mineral Resources and Reserves Update at the Blanket Mine February 6, 2023
Caledonia Mining Corporation Plc Record Annual Production at Blanket Mine and Guidance for 2023 January 13, 2023

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