• Data Access
  • Your Email  
  • Your Email  
Keep me signed in.
Forgot your password?
Close
  • Forgot Your Password?
  • Enter the email you signed up with and we'll email it to you.
  • Your Email  
Close
Back
MDO
Mining Data Solutions
  • Home
  • Database
  • Subscribe
  • Sign In
  • Sign In
Ghana
Obuasi Mine

This page is not tailored to
devices with screen width under 750 px.
 Location:
55 km S from Kumasi, Ghana

  Regional Office:
Gold House, Patrice Lumumba Road
PO Box 2665
Accra
Ghana
Phone  ...  Subscription required
Fax+233-303-778155
WebsiteWeb
Additional Resources for Suppliers & Investors
Drill results over 30 g/t Au
Stay on top of recent discoveries.
Search drill results by commodity and grade.
Largest mines in the Americas
Mining and mill throughput capaciites.
Full profiles of select mines and projects.
Deepest underground mines
Shaft depth and mill throughput data.
Full profiles of select mines and projects.
Heavy mobile equipment
HME type, model, size and quantity.
Full profiles of select mines and projects.
Permitting and construction projects
Projects at the permitting or construction stage. Full profiles of select projects.
Mines with remote camps
Camp size, mine location and contacts.
Full profiles of select mines and projects.
Mines & projects in Ghana
A list of country's mines and projects.
Full profiles of select mines and projects.
  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

Thank you for browsing through mine profiles compiled by the Mining Data Online team.

Would you like to subcribe or schedule a Demo?
  • Name:
     
  • Company:
     
  • Position:
     
  • Phone:
  • Email:
  • Message:

Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Sub-level caving
  • Longhole open stoping
  • Transverse open stoping
  • Longitudinal retreat
  • Longitudinal stoping
Production Start...
Mine Life20 years (as of Jan 1, 2021)
Underground mining activities resumed in October 2021, after they were voluntary suspended in May 2021 immediately following the failure of a sill pillar. Towards the end of the first quarter of 2022, the restart plan was tracking to schedule. Construction of the major infrastructure to support the ramp up to 4,000tpd was complete by year end, with the paste-fill plant and GCVS vent fans commissioned. The KRS hoisting system is in service and the ramp up to 4,000tpd is targeted for the end of the first half of 2022. Major infrastructure works are required to support a further ramp up of production. This will include the upgrade of the KMS shaft and KMV shaft as well as the development of a new ventilation shaft. Phase 3 construction is expected to be completed at the end of 2023 when the mining rate is planned to lift to 5,000tpd.


Owners

Source: p. 23
CompanyInterestOwnership
AngloGold Ashanti Ltd. 100 % Indirect
Obuasi gold mine is owned and operated by AngloGold Ashanti (Ghana) Limited (AGAG).

Contractors

Subscription required - Subscription is required.


Deposit Type

  • Vein / narrow vein


Summary:

Gold mineralisation is associated with, and occurs within, graphite-chlorite-sericite fault zones. These shear zones are commonly associated with pervasive silica, carbonate and sulphide hydrothermal alteration and occur in tightly-folded Lower Birimian schists, phyllites meta-greywackes, and tuffs, along the eastern limb of the Kumasi anticlinorium.

Two main ore types are mined, namely quartz vein and sulphide ore. The quartz vein type consists mainly of quartz with free gold in association with lesser amounts of various metal sulphides containing iron, zinc, lead and copper. This ore type is generally nonrefractory. Sulphide ore is characterised by the inclusion of gold in the crystal structure of arsenopyrite minerals. Higher gold grades tend to be associated with finer grain arsenopyrite crystals. Sulphide ore is generally refractory.

The mine is located within the Obuasi concession area in south-western Ghana along the north easterly-striking Ashanti volcanic belt. The deposit is one of the most significant Proterozoic gold belts discovered to date. The Ashanti belt predominantly comprises sedimentary and mafic volcanic rocks, and is the most prominent of the five Birimian Supergroup gold belts found in Ghana. The belt is a 300km wrench fault system that propagated from Dixcove in the south-west to beyond Konongo in the north-east.

The Birimian was deformed, metamorphosed and intruded by syn- and post-tectonic granitoids during the Ebur ........


Mining Methods

  • Sub-level caving
  • Longhole open stoping
  • Transverse open stoping
  • Longitudinal retreat
  • Longitudinal stoping


Summary:

Obuasi Gold Mine is located in the municipality of Obuasi, in the Ashanti region of Ghana, about 240km northwest of the capital Accra and 60km south of Kumasi.

Obuasi is an underground operation with the main accesses into the mine consisting of shafts and a single access decline with interlevel development of between 15 and 30m. The Obuasi Deeps Decline, which is situated at the southern end of the mine, is designed to extend to a depth of about 1500m. The Obuasi Underground operation employs mostly Long Hole Open Stoping (LHOS) mining method for ore extraction. LHOS is a highly selective and productive method of mining that can be employed for orebodies of varying thickness and dips. The three main distinct variations of the LHOS used at Obuasi are Longitudinal Retreat Stoping (LRS), Longitudinal Open Stoping (LOS) and Transverse Open Stoping (TOS). The Blind Upper Stoping is a form of LRS or TOS used for partial sill pillar recovery. Underhand drift and fill (UHDF) which is used at Côte d’Or with extensive historical cut and fill mining is planned to be converted into LHOS.

At Obuasi, underground operations were suspended in May 2021 following a geotechnical event and fatality. A detailed review into the incident and its causes was followed by a thorough external review of future mining fronts covering the mine design, schedule and ground management plan. Underground mining activities remained suspended until mid-October 2021 when stoping activities r ........


Crushing and Grinding
Source: Subscription required

- subscription is required.


Processing

Source: Subscription required

Summary:

- subscription is required.


Production:

CommodityUnits2022202120202016
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required3
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202016
Tonnes processed  ......  Subscription required  ......  Subscription required
Annual processing capacity  ......  Subscription required  ......  Subscription required2.4 Mt
Subscription required - Subscription is required.

Reserves at December 31, 2021:
Reserves cut-off grades vary from 3.82 to 5.01 g/t Au depending on ore hosting block.

CategoryTonnage CommodityGradeContained Metal
Proven & Probable 30.8 Mt Gold 8.34 g/t 8.26 M oz
Total Resource 109.32 Mt Gold 7.63 g/t 26.8 M oz

Commodity Production Costs:

CommodityUnits202220212020
Total cash costs Gold USD  ......  Subscription required  ......  Subscription required
All-in sustaining costs (AISC) Gold USD  ......  Subscription required&nbs  ......  Subscription required  ......  Subscription required
All-in sustaining costs (sold) Gold USD
^ Guidance / Forecast.
Subscription required - Subscription is required.

Financials:

Units2021202020192016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 6  
Subscription required - Subscription is required



Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 26, 2022
....................... Subscription required ....................... Subscription required Subscription required May 26, 2022
....................... Subscription required ....................... Subscription required Subscription required May 26, 2022
....................... Subscription required ....................... Subscription required Subscription required May 26, 2022
....................... Subscription required ....................... Subscription required Subscription required May 26, 2022
....................... Subscription required ....................... Subscription required Subscription required May 26, 2022
....................... Subscription required ....................... Subscription required Subscription required May 26, 2022
....................... Subscription required ....................... Subscription required Subscription required May 26, 2022
....................... Subscription required ....................... Subscription required Subscription required May 26, 2022
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required Subscription required Subscription required 2017
Subscription required Subscription required Subscription required 2016
Subscription required Subscription required 2015
Subscription required Subscription required Subscription required 2014

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Fact Sheet 2018
Year-end Mineral Reserves 2018
Integrated Report 2017
Year-end Mineral Reserves 2017
Annual Report 2016
Corporate Presentation 2016
Year-end Mineral Reserves 2016
Annual Report 2015
Year-end Mineral Reserves 2015
Other 2014
Subscription required - Subscription is required.

Subscription required - Subscription is required.

Terms of Use Privacy Policy © 2017-2023 MDO Data Online Inc.