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Zimbabwe
Freda Rebecca Mine

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 Location:
2 km W from Bindura, Zimbabwe

  Address:

P.O Box 70
Bindura
Zimbabwe
Phone  ...  Subscription required
Fax+263 (34) 7302
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Sub-level stoping
Processing
  • Gravity separation
  • Inline Leach Reactor (ILR)
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life6 years (as of Jan 1, 2016)


Owners

 
CompanyInterestOwnership
Sotic International Ltd. 85 % Indirect
Landela Mining Ventures, which is controlled by Sotic, is ramping up output at Freda Rebecca, an operation formerly owned by Asa Resources.

Suncraft Enterprises (Pvt) Ltd. is also the only minority shareholder in Freda Rebecca, with 15 per cent.

Deposit Type

  • Hydrothermal


Summary:

Freda Rebecca is lies on the central axis of the synclinal Mazowe-Bindura Greenstone belt. The geology of the area around FRM is characterised by the Shamvaian sediments, diorite and granodiorite. Dolerite dykes cut through the three rock types. The FRM orebodies are largely hosted by the Prince of Wales diorite and the Bindura granodiorite, with limited transgressions into the metasediments. The mineralisation is hosted within two major shear envelopes: the footwall/curvilinear Freda-Promoter which strikes from north east through to east west and dips at 0 to 25° to the south; and the Rebecca which strikes north west and dips at 35°. Individual shears are variable in width and these two systems merge to the south west at depth flattening at around 850m elevation and extending into the metasediments. The shear system is characterized by a set of anastomosing shears separated by relatively undeformed rock units.

At FRM there are two styles of sulphide mineralisation: older disseminated, pervasive sulphides occurring throughout the sediments, diorite and granodiorite, which vary in intensity and grade; and younger mineralisation restricted to shear zones and associated with higher gold grades. In both types of mineralisation, higher grades are associated with fine-grained sulphides. Sulphides include arsenopyrite, pyrite, pyrrhotite and chalcopyrite. Mineralisation is characterised by patchy micaceous chloritic alteration with some silicification and to a lesser degree, carbonatization. Quartz veins generally do not carry gold values but may contain minor amounts of sulphide. Payable gold mineralisation is not visually distinct so assaying is required to outline the ore zones.


Mining Methods

  • Sub-level stoping


Summary:

The underground mine is accessed by ramps driven from portals in the old open pits and the current depth of mining is some 200m below these portals. A sub-level stoping mining method is predominantly employed and the ore is trucked to surface using a variety of articulated dump trucks. One-way haul distances are of the order of 3-3.7km and the cycle time for trucking is typically 45 min. Adaptations of this mining method as well as room and pillar mining are undertaken depending on the characteristics of the orebody and stope design.


Crushing and Grinding


Processing

  • Gravity separation
  • Inline Leach Reactor (ILR)
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

RoM is delivered to the plant by dump trucks and is crushed via one of two jaw crushers. Rock that is too large to be crushed is removed and stockpiled for secondary blasting. After crushing the ore is stockpiled ahead of single stage semi autogenous grinding (SAG) mills in two similar parallel milling circuits. The SAG mills are closed by hydro cyclones and a portion of the cyclone underflow is directed to Knelson centrifugal gravity concentrators. Gravity concentrates are processed by intensive cyanidation in an InLine Reactor ahead of gold recovery by electro-winning. Approximately 20% of the gold recovered is attributed to gravity concentration. Cyclone overflow is pumped to a cluster of dewatering cyclones to increase the percentage solids to that required in the pre-leach and carbon in leach (“CIL”) adsorption circuit. Lime is added earlier in the process at the mill feed. Appropriate lixiviant levels are maintained by the controlled addition of calcium cyanide and oxygen. Loaded ........

Recoveries & Grades:

CommodityParameter2016201520142013
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 2.122.12.64
Subscription required - Subscription is required.

Production:

CommodityUnits20172016201520142013
Gold oz 58,95067,67358,71458,70465,350
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics20172016201520142013
Ore tonnes mined  ......  Subscription required1,215,089 t1,187,070 t1,098,244 t1,043,764 t
Tonnes milled  ......  Subscription required1,199,074 t1,203,468 t1,060,561 t958,568 t
Annual mining capacity  ......  Subscription required
Annual milling capacity  ......  Subscription required

Reserves at March 31, 2016:

CategoryTonnage CommodityGradeContained Metal
Indicated 14,658 kt Gold 2.39 g/t 1,126 koz
Inferred 7,252 kt Gold 2.49 g/t 581 koz

Commodity Production Costs:

CommodityUnits20172016201520142013
All-in sustaining costs (AISC) Gold USD 1,150 / oz 1,076 / oz 1,259 / oz 1,186 / oz 1,115 / oz
C1 cash costs Gold USD 1,010 / oz 943 / oz 1,067 / oz 959 / oz 897 / oz


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 22, 2020
....................... Subscription required ....................... Subscription required Subscription required Oct 22, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Annual Report 2016
Annual Report 2014
Technical Report 2007
Subscription required - Subscription is required.

Aerial view:

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