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Saudi Arabia
Ad Duwayhi Mine

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 Location:
120 km NE from Ranyah, Saudi Arabia

  Regional Office:
Building number 395 Abi Bakr Asseddiq Road, South Exit 6, North Ring Road
P.O. Box 68861
Riyadh
Saudi Arabia
11537
Phone  ...  Subscription required
Fax+966-(0)-11-874-8300
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Gravity separation
  • Carbon re-activation kiln
  • Filter press plant
  • Dewatering
  • Smelting
  • Centrifugal concentrator
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2026


Owners

Source: p. 136
CompanyInterestOwnership
Maaden Saudi Arabian Mining Co. 100 % Indirect
Maaden Gold and Base Metals Company (operator) 100 % Direct
Ma’aden Gold and Base Metals company (MGBM) is a wholly owned subsidiary of Maaden Saudi Arabian Mining Co. (Ma’aden), operates six gold mines in Saudi Arabia: AdDuwayhi, Mahd Ad Dhahab, Al Amar, Bulghah, Sukhaybarat and As Suq.

Deposit Type

  • Vein / narrow vein
  • Hydrothermal


Summary:

Ad Duwayhi lies within the Afif composite terrain in the central Arabian Shield. The Afif terrain consists of a complex assemblage of volcanic arc sequences and a continental microplate that are overlain by successor-basin volcano-sedimentary sequences (Bani Ghayy and Murdama Groups). All these rocks were intruded by post-tectonic granitic rocks.

The deposit lies at the southern end of a zone of Pre-Cambrian volcano-sedimentary rock, which have been overprinted by greenschist facies metamorphism. The deposit is located to the north of a fault bounded belt of folded meta- sediments and plutonic rocks. A granodiorite body lies to the east of the deposit, with the deposit stratigraphy cut by multiple intrusive dykes and sills of dolerite, rhyolite, porphyritic granite and a polymict breccia pipe.

The main mineralisation is associated with a curved thrust structure with an average strike of 045° and dip of 45° southeast, curving from a northerly direction in the southwest to an easterly direction in the northeast. There are other more minor mineralised structures on different trends.

Hydrothermal alteration is common across the deposit area comprising silicification (everpresent), quartz-sericite-pyrite, potassic and propylitic. The quartz-sericite-pyrite alteration is most closely associated with the gold mineralisation.

The main mineralisation is structurally controlled by the curved thrust structure, with a thrust zone typically between 2m to 10m thick with heavily deformed cataclastic rocks with well developed quartz veins. Thin, high-grade gold veins are also found outside of the main mineralised vein.

Gold is typically found associated with pyrite and tetrahedrite (3% to 5% by volume), and is found in the form of fine grained free gold (>5µm), not locked within other sulphides, although some is found in gold and silver tellurides.

It should be noted that gold mineralisation is also present as placer deposits in the vicinity of the deposit, within the colluvial material.

In summary, the geology and major controls on the mineralisation appear to be well understood, aiding the ability to model the deposit effectively and appropriately. The deposit exhibits typical features of shear-zone gold deposits.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mine access to the open-pits is via a single haul road developed as part of the starter pit and the final pit and extending from surface to a depth of 145m below surface. The open-pit is designed with the following parameters: 20m wide ramps with a gradient of 10% and overall slope angles ranging from 45° to 58°. Other final design aspects are: bench heights of 15m; batter angles of 75°; and berm widths of 8m.

Mining methods comprise standard drill-blast-load-haul. Mining occurs by drilling and blasting 5m high sub-benches with 120mm to 200mm blast holes. Hydraulic excavators with 8.4m3 bucket capacities load blasted ore and 10.0m3 bucket capacities load waste into 80t rear-dump haul trucks. Additional service equipment comprise graders, tracked dozers, water trucks and general service vehicles.


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

Summary:

RoM ore from the open-pit operations is crushed in a single stage primary crusher fed by loader which in turn will establish a live crushed primary ore stockpile. Following reclamation by conveyor, crushed ore is milled in a semiautogenous grinding mill (“SAG”) with pebble recycling and a ball mill operating in closed circuit. The combined SAG and ball mill discharge is pumped to hydro-cyclones to produce a nominally 80% passing 75µm product. Cyclone underflow is treated in a gravity circuit to recover free gold before recycling to the ball mill.


Processing

  • Gravity separation
  • Carbon re-activation kiln
  • Filter press plant
  • Dewatering
  • Smelting
  • Centrifugal concentrator
  • Carbon in leach (CIL)
  • AARL elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Ad Duwayhi Plant processes ore mined from the open-pit operation. The process has comprises a comminution circuit, a parallel gravity circuit for recovery of coarse grained free gold and a CIL circuit followed by elution, electrowinning and smelting to produce gold in doré form for third party refining.

Slurry from the comminution circuit is thickened prior to leaching in a six stage CIL circuit ahead of elution (AARL circuit), electrowinning and smelted along with the gravity concentrates to produce doré.

Tailings arising from the CIL circuit is thickened and filtered to enable dry storage and minimise water usage.

Recoveries & Grades:

CommodityParameter2020201820172016
Gold Recovery Rate, %  ......  Subscription required9595.396.2
Gold Head Grade, g/t  ......  Subscription required2.571.85

Production:

CommodityUnits20202019201820172016
Gold oz  ......  Subscription required  ......  Subscription required274,519163,10456,314
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2019201820172016
Annual processing capacity 2.3 Mt2 Mt
Ore tonnes mined 5,095,303 t4,489,793 t
Waste 16,863,941 t16,173,096 t
Tonnes milled 2,071,125 t1,311,615 t

Reserves at December 31, 2020:

CategoryTonnage CommodityGradeContained MetalRecoverable Metal
Proven 2.4 Mt Gold 3.3 g/t
Probable 18.9 Mt Gold 1.4 g/t
Proven & Probable 21.3 Mt Gold 1.7 g/t 1.12 M oz 1.07 M oz
Measured 2.2 Mt Gold 4.3 g/t
Indicated 17.6 Mt Gold 1.5 g/t
Inferred 8.9 Mt Gold 1.7 g/t
Total Resource 28.7 Mt Gold 1.8 g/t 1.68 M oz

Financials:

Units20172016
Revenue M SAR 777.7   264.8  


Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Aug 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 31, 2021
....................... Subscription required ....................... Subscription required Subscription required Aug 31, 2021
Subscription required - Subscription is required.

Staff:

Total WorkforceYear
Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
Annual Report 2018
Financial Review 2018
Annual Report 2017
Annual Report 2016
Other 2007
Subscription required - Subscription is required.

Aerial view:

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