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Burkina Faso
Mana Mine (Siou UG expansion Mine)

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 Location:
25 km SW from Safane, Burkina Faso

  Regional Office:
Sector 13, Babanguida Avenue Benda Street, Door # 211
01 PO Box 390
Ouagadougou 01
Burkina Faso
Phone  ...  Subscription required
Fax(011)-226-50-36-95-87
EmailEmail
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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
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Smelting
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life8 years (as of Jan 1, 2017)
On August 5, 2019 SEMAFO announced that there was a pit wall failure at Mana in the Wona pit. No mining was underway in the area, and no-one was injured. Therefore, annual guidance at Mana was revised to 130,000 – 140,000 from the original 170,000 – 190,000 ounces.
Latest NewsSEMAFO Reports Cash Flow from Operations of $110 Million in 2018     March 5, 2019


Owners & OPERATOR

Source: p. 15
CompanyInterestOwnership
Endeavour Mining Corp. 90 % Indirect
SEMAFO Burkina Faso S.A. (operator) 100 % Direct
July 1, 2020 /CNW Telbec/ - SEMAFO Inc. (TSX: SMF) (OMX: SMF) ("SEMAFO") is pleased to announce the successful completion of the previously announced plan of arrangement (the "Arrangement") involving SEMAFO and Endeavour Mining Corporation ("Endeavour") effective July 1, 2020.

The SEMAFO shares will be delisted from the Nasdaq Stockholm and from the Toronto Stock Exchange.

Semafo Burkina Faso S.A. (“SEMAFO BF”), a corporation held 90% by SEMAFO and 10% by the Republic of Burkina Faso.

Deposit Type

  • Vein / narrow vein
  • Orogenic


Summary:

All deposits on the Mana property are characterized as typical West African, shear- hosted orogenic gold deposits.

The WonaKona deposit is hosted in relatively wide corridors of silicification with disseminated mineralization hosted in a sheared package of alternating fine grained metasediments and metavolcanics. At Yaho, the mineralization is associated with a strongly sericitized arenite, locally conglomeratic located within a wider deformation zone affecting metavolcanics and other fine grained sediments. The three southern deposits (Nyafé, Fobiri and Fofina) are hosted in dominantly sheared and silicified volcanic rocks hosted within quartz rich veins. These veins tend to be richer but narrower. Finally, the newly discovered Siou Zone is composed of a series of shear zones hosting free-gold bearing quartz veins located along a contact between a sedimentary sequence and a felsic intrusive.

The Wona-Kona mineralization occurs as disseminated pyrite and arsenopyrite in highly deformed and silicified meta-sedimentary of meta-volcano-sedimentary rocks. Locally, silicification is so intense as to form massive quartzitic bodies, which are commonly preserved within the saprolitic horizon. In some extreme cases blasting is necessary to mine within the saprolite horizon.

The mineralization at Nyafé, Fofina and Fobiri is also associated to pyrite and arsenopyrite disseminated on the edge of millimetric veinlets of microcrystalline grey quartz. Folded carbonate veinlets cross the mineralization.

Disseminated pyrite and arsenopyrite is omnipresent throughout the sericitized arenite which hosts the Yaho Zone but higher percentages are observed within four separate zones which also hosts the better gold grades. Gold values are consistently anomalous throughout the entire host unit (above 100 ppb). The delineated subparallel gold zones within the arenite can measure more than 50 meters thick, sometimes accounting for more than 50% of the entire host unit.

The mineralization at Siou occurs at or near the contact between a sedimentary unit to the west and a granodioritic intrusive to the east where series of shear zones containing quartz veining and sericite alteration over thicknesses of 5 to 25 meters are observed. The Siou Zone and the Nine Zone vary from less than one meter to close to 20 meters in width, with an average of between 4 and 4.5 meters. The shear zones dip approximately 45 to 60 degrees to the east.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Two mining methods will be employed at the Mana operation. Open pit mining will continue to be used at Wona/Kona and part of the Siou ore zone, and at Fofina and Nyafé. Following identification of the ore at depth, underground mining will be employed in the southern part of the Siou deposit.

Open Pit Mining
Open pit mine production at Mana averages approximately 7,500 t/d of ore, mainly from the Wona and Siou pits, that can be blended with ore from the other open pit sources up to a maximum of 8,000 t/d for processing in the mill. The Kona pit has been mined out and backfilled.

Underground Mining at Siou
Two underground mining methods will be used: long hole (longitudinal retreat and transversal) and cut and fill mining; these were selected because of the inclination of mineralized lenses and ore (stockwork) thickness. Long hole mining will be used when a stope can be mined economically above a dip of 50o degrees and by cut and fill below 50o . Most of the areas where the Siou orebody is located in the hanging wall will be mined cut and fill. Consolidated backfill and loose rock will be used to ensure safe ore recovery in long hole mining. For cut and fill mining, pivot ramps will be driven from the main access ramp.

SEMAFO envisages underground production at Siou reaching capacity in the second quarter of 2020. Detailed engineering will take place through the first half of 2018. It is expected that the mining contractor will be mobilized in the third quarter of 2018, with portal preparation and underground development initiated immediately.


Crushing and Grinding


Processing

  • Smelting
  • Agitated tank (VAT) leaching
  • Counter current decantation (CCD)
  • Carbon in leach (CIL)
  • Carbon adsorption-desorption-recovery (ADR)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

ROM ore is loaded by a WA600 front end loader onto a static grizzly screen to handle slabby material. A rock breaker reduces the oversize material that remains on the static screen (625 X 665 mm). Fine material drops into a 150 tonne capacity ROM bin. The ore is then extracted from the bin by a primary apron feeder (1,524 mm X 7,000 mm) and fed to a vibrating scalper (1,500 mm X 4,000 mm) to further separate the fines. Coarse material from the scalper feeds directly into a 36" X 48" (950 mm X 1,250 mm) single toggle jaw crusher. The crusher produces a product with a P80=100 mm, at a rate of 400-500 wtph to allow for a 17 hour per day crushing operation.

The grinding circuit consists of a Semi Autogenous Grinding mill (SAG) in close circuit with a vibrating screen and a pebble crusher. The 7.92 meter diameter X 2.74 meter Allis Chalmers SAG is equipped with 2,387 KW variable speeds motor and operates between 10-15% ball charges depending on ore hardness. Variable speed contro ........

Recoveries & Grades:

CommodityParameter201920182017201620152014
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 2.282.362.462.883.632.9
Subscription required - Subscription is required.

Production:

CommodityUnits202020192018201720162015
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required206,400240,200255,900
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required2,753,300 t2,399,100 t2,754,400 t
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required8,000 t8,000 t8,000 t
Daily mining capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required110,000 t100,000 t100,000 t
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 3,260,000 t Gold 3.56 g/t 373,500 oz
Probable 11,783,000 t Gold 2.73 g/t 1,033,600 oz
Proven & Probable 15,043,000 t Gold 2.91 g/t 1,407,100 oz
Measured 8,828,000 t Gold 1.48 g/t 418,900 oz
Indicated 34,808,000 t Gold 2.04 g/t 2,280,600 oz
Measured & Indicated 43,636,000 t Gold 1.92 g/t 2,699,500 oz
Inferred 8,945,000 t Gold 2.66 g/t 765,800 oz

Commodity Production Costs:

CommodityUnits2020201920182017201620152014
Total cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required 655 / oz 548 / oz 493 / oz 649 / oz
All-in sustaining costs (AISC) Gold USD  ......  Subscription required ^
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required 942 / oz 720 / oz 645 / oz 801 / oz
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operating Costs:

Units201920182017
Total operating costs ($/t milled) USD 636862

Financials:

Units2020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required
Operating Income M USD  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2017:
HME TypeModelSizeQuantity
Dozer 6
Drill ....................... Subscription required 2
Drill ....................... Subscription required 2
Drill ....................... Subscription required 2
Drill ....................... Subscription required 2
Drill ....................... Subscription required 2
Excavator ....................... Subscription required 10 cu. m 2
Excavator ....................... Subscription required 6.5 cu. m 8
Excavator ....................... Subscription required 1
Excavator ....................... Subscription required 1
Grader 3
Loader 4
Truck (haul) 65 t 25
Truck (haul) ....................... Subscription required 90 t 14
Truck (haul) ....................... Subscription required 8
Truck (water) 50 cu. m 3
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 21, 2020
....................... Subscription required ....................... Subscription required Subscription required Jul 21, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
Annual Information Form 2017
Pre-Feasibility Study Report 2017
Annual Information Form 2016
Annual Information Form 2015
Annual Information Form 2014
Technical Report 2013
Subscription required - Subscription is required.

News:

NewsDate
SEMAFO Reports Cash Flow from Operations of $110 Million in 2018 March 5, 2019

Aerial view:

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