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DRC
Namoya Mine

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 Location:
52 NE from Wamaza, DRC

  Regional Office:
374, Avenue Colonel Mondjiba, Commune de Ngaliema
Kinshasa
DRC
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Centrifugal concentrator
  • Desliming
  • Dewatering
  • Carbon re-activation kiln
  • Heap leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon in solution (CIS)
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
  • Sodium carbonate (reagent)
Mine Life2028
Namoya Mine was put on care and maintenance on June 1th 2020.


Owners

Source: p. 1
CompanyInterestOwnership
Baiyin International Investment Ltd. 34.5 % Indirect
Shomka Capital Limited 65.5 % Indirect
Shomka Resources Ltd. (operator) 100 % Direct
Shomka Resources Limited, a Hong Kong based resources company is pleased to announce that it has reached an agreement to buy 100 percent interest in Namoya Mining.

Shomka Resources is a JV owned 65.5% by Shomka Capital Ltd and 34.5% by Baiyin International Investments Ltd.

Deposit Type

  • Breccia pipe / Stockwork


Summary:

The Namoya Project lies on the western edge of the Kibaran Mobile Belt (KMB). The KMB is an intercontinental mobile belt which was formed during the Mesoproterozoic between 1.4Ga and 0.9Ga when the supercontinent Rodinia was formed. The KMB is also known as a metallogenic province.

The Namoya Project, even though segmented into separate prospects, boasts one type of gold mineralisation style. The following deposit characteristics have been noted:-
-gold mineralisation hosted within quartz veins and quartz stockworks, striking in a northwestsoutheast direction;

- prevalence of tourmaline crystals within the quartz veins;

- deformation structures within the quartz veins, resulting in irregular sheets, nested vein sets, ladder veins and micro-veinlets, characteristic of shearing;

- no granitic intrusions in the immediate area of the Namoya orebody (as a possible source of tourmaline) although quartz porphyry intrusions have been intersected by drill holes at Namoya Summit and Muviringu signifying potential for a deep seated granitic body; and

- sericite/chlorite schists, sometimes with carbonates, indicative of a magmatic and hydrothermal processes.

The deposit characteristics are typical of the intrusion-related, tungsten/tin-associated type. This class of magmatic-hydrothermal deposits occurs within magmatic provinces best known for tungsten and/or tin mineralization. This type of deposit contains a metal suite that includes some combination of bismuth, tungsten, arsenic, tin, molybdenum, tellurium and antimony and contrasts with that found in more widely-developed goldrich porphyry copper deposits.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining operations are based on conventional drill and blast, load and haul mining techniques. Ore is drilled and blasted, and loaded by hydraulic excavators in backhoe configuration, with off highway dump trucks.

Excess RoM is stockpiled on the ROM pad, with low grade ore sent to the low grade stockpile, located approximately 400m from the RoM pad. Stockpiled RoM ore is sorted under a stockpile grade control management scheme, with stockpile reclaim undertaken by a front end loader, and then fed to the crusher as required. Waste material mined is hauled to close-by waste dumps.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1
Cone crusher 1

Summary:

Primary Crushing
ROM, delivered by 40t trucks, is deposited into a tipping bin fitted with an 800mm static grizzly to prevent oversize material from entering the system. A rock breaker has been installed to ensure that all +800mm feed ore is broken to -800mm size, in line with process specifications. From the tipping bin, the ore is fed onto a 150mm vibrating grizzly using an apron feeder from which the -800+150mm material is deposited into a jaw crusher, which reduces the -800+150mm material to a topsize of 210mm. The resulting -210mm material from the jaw crusher, together with the -150mm from the vibrating grizzly, is conveyed along a 1.5km conveyor belt to the secondary crushing plant.

Secondary and Tertiary Crushing
The -210mm material from the primary crushing plant is deposited onto the primary crushing stockpile whose residence time is 12 hours. The stockpile serves to provide backup plant feed against conveyor length surge and maintenance requirements of the primary crusher. The stockpile has two sets of reciprocating plate feeders (2 running, 2 on standby) which are designed to handle wet clay material as well as assist prevention of “rat holing” in the stockpile.

Ore is withdrawn from the primary crushing stockpile and fed into a rotary scrubber in order to remove clays from the ore. The scrubber is fitted with a 40mm trommel discharge screen which allows for the oversize material (-210+40mm) to report to the secondary cone crusher which reduces feed to 100% passing 40mm. The undersize material from the scrubber (- 40mm) reports to a 2mm vibrating screen from where the -2mm material is fed to the gravity section whilst the -40+2mm material is fed to the tertiary crushing circuit.

The tertiary crushing circuit crushes material from the secondary crushers as well as the - 40+2mm material from the scrubber to 100% passing 10mm. The crushed ore is discharged onto a double deck screen with a top screen cutting at 10mm and the bottom screen cutting at 2mm. The oversize fraction from the top deck (-40+10mm) is returned to the tertiary crusher. The bottom deck oversize fraction (-10+2mm) reports to the heap leach pad whilst the bottom deck undersize (-2mm) reports to the gravity recovery section.


Processing

  • Gravity separation
  • Centrifugal concentrator
  • Desliming
  • Dewatering
  • Carbon re-activation kiln
  • Heap leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Carbon in solution (CIS)
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
  • Sodium carbonate (reagent)

Flow Sheet: Subscription required

Summary:

Namoya process plant makes use of a hybrid leach design in which a heap leach operation works in conjunction with a gravity gold recovery operation and a CIL plant.

The objective of the gravity recovery section is to recover gravity-recoverable gold from the - 2mm size fraction. Feed material is pumped from the secondary and crushing circuit to a dewatering cyclone. The cyclone underflow then reports to one of two Knelson concentrators. The resulting concentrate reports to the gold room whilst the gravity tailings report to a desliming cyclone cutting at 150µm. The cyclone underflow (-2mm+150µm) gravitates to a dewatering screen from where the coarse (oversize) fraction reports to the heap leach pad. The -150µm fraction from the desliming cyclone, together with the undersize from the dewatering cyclone, report to a vibrating trash screen cutting at 800µm. The screen underflow is fed to a thickener feed tank where flocculant is added. The resulting mixture is then discharged ........

Recoveries & Grades:

CommodityParameter20172016
Gold Recovery Rate, % 76.556.6
Gold Head Grade, g/t 1.891.89

Production:
Namoya mine was only one month into production in 2020.

CommodityProductUnits20202019201820172016
Gold Metal in concentrate koz  ......  Subscription required  ......  Subscription required54
Gold Metal in conc./ doré koz 6993
Subscription required - Subscription is required.

Operational Metrics:

Metrics20172016
Total tonnes mined 7,282,882 t9,546,622 t
Ore tonnes mined 1,516,045 t2,100,343 t
Stripping / waste ratio 3.55
Annual production capacity 100 koz of gold metal in concentrate

Reserves at December 31, 2015:

CategoryTonnage CommodityGradeContained Metal
Proven 17.9 Mt Gold 2.1 g/t 1.21 M oz
Probable 3.04 Mt Gold 1.53 g/t 0.15 M oz
Proven & Probable 20.94 Mt Gold 2.02 g/t 1.36 M oz
Measured 20.44 Mt Gold 2.02 g/t 1.33 M oz
Indicated 5.24 Mt Gold 1.73 g/t 0.29 M oz
Measured & Indicated 25.68 Mt Gold 1.96 g/t 1.62 M oz
Inferred 5.03 Mt Gold 1.63 g/t 0.26 M oz

Commodity Production Costs:

CommodityUnits2016
Cash costs (sold) Gold USD 814 / oz
All-in sustaining costs (sold) Gold USD 930 / oz

Financials:

Units2016
Capital expenditures M USD 12,901  
After-tax Income M USD -14,107  
EBITDA M USD 27,444  


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 20, 2022
....................... Subscription required ....................... Subscription required Subscription required Jan 20, 2022
....................... Subscription required ....................... Subscription required Subscription required Jan 20, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2015
Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
Corporate Presentation 2017
Press Release 2017
Financial Review 2016
Press Release 2016
Sustainability Report 2016
Annual Information Form 2015
Technical Report 2014
Subscription required - Subscription is required.

Aerial view:

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