• 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
Brazil
Jacobina Mine (Jacobina Expansion Project)

This page is not tailored to
devices with screen width under 750 px.
 Location:
8 km S from Jacobina, Brazil

  Address:
Fazenda Itapicuru, s/n
Jacobina
Brazil
44700-000
Phone  ...  Subscription required
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 Brazil
A list of country's mines and projects.
Full profiles of select mines and projects.
  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • 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 stoping
Processing
  • Gravity separation
  • ACACIA reactor
  • Centrifugal concentrator
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life20 years (as of Jan 1, 2020)
During the fourth quarter, Jacobina received the expansion permit, allowing throughput to increase to 10,000 tpd. The mine is now expected to achieve the Phase 2 throughput objective of 8,500 tpd by the second quarter of 2022.
Latest NewsYamana Gold Reports Significant Progress on Phase 2 Expansion at Jacobina and Strong Exploration Results for the Operation; Costs to Complete Phase 2 Significantly Reduced...     July 29, 2021


Owners

Source: p. 13
CompanyInterestOwnership
Yamana Gold Inc. 100 % Indirect
Yamana Gold Inc. (Yamana) holds a 100% interest in the property through its subsidiary, Jacobina Mineração e Comércio S. A. (JMC).

Deposit Type

  • Conglomerate hosted
  • Paleoplacer


Summary:

The mineralization at Jacobina consists of conglomerate-hosted gold deposits generally interpreted to represent paleoplacer gold deposits, with some post-depositional modification by structural and hydrothermal events.

The Jacobina gold district is defined by a 40-km long belt that extends from Campo Limpo, in the south, to Santa Cruz do Coqueiro, in the north. The vast majority of significant gold mineralization occurs within the matrix of the conglomerates; these include the Canavieiras, Morro do Vento, João Belo, Serra Branca deposits as well as other minor occurrences.

The gold mineralization found at Jacobina occurs as two styles of mineralization (Texeira et al, 2001):
• Conglomerate-hosted placer gold mineralization (the most important mineralization type in the Jacobina district)
• Post-depositional gold-bearing stockwork, shear zones, and associated extensional quartz veins. These styles of mineralization are relatively minor and do not contribute to the established resources at Jacobina.

CONGLOMERATE-HOSTED PLACER GOLD MINERALIZATION
Conglomerate-hosted deposits contain very fine grains of native gold, typically 20 to 50 µm in size, hosted in the matrix of the conglomerate. Gold may also be associated with rounded pyritic aggregates believed to be of sedimentary origin. There are no other significant elements present, with detailed studies of the reef chemistry showing only very minor enrichment in iron, titanium and uranium in some reefs associated with rounded grans of uraninite, ilmenite and rutile. Mineralization is typically hosted by well sorted, clast-supported conglomerate and may comprise micro-fractured, gold-bearing, recrystallized, silicified, and pyritic conglomerate units of the Serra do Córrego Formation, with a greenish fuchsite matrix and common hematite coatings along shear planes, joints, and fracture surfaces. Gold mineralization does not display a correlation with the pyrite or fuchsite content of the rock, although well-mineralized reefs are typically enriched in hematite and may contain red colored, oxidized pebbles.

POST-DEPOSITIONAL GOLD-BEARING STOCKWORK, SHEAR ZONES AND EXTENSIONAL QUARTZ VEINS
This group encompasses gold-bearing extensional quartz veins and veinlets related to semiconcordant shear zones hosted by quartzites, andalusite-graphite-quartz schists, and local conglomerates of the Rio do Ouro Formation (e.g., Goela da Ema, Biquinha, Cercadinho and Guardanapo gold workings). This style of gold mineralization is a very minor volumetric component at Jacobina and does not contribute significantly to the mineral resource. The main hydrothermal alterations associated with this style of mineralization are silicification, sericitization, chloritization, and pyritization (locally with chalcopyrite), and local tourmalinization.

The ultramafic and mafic rocks also host mineralization as narrow shear zones up to 4 m- thick in north-south oriented ultramafic sills and dikes, close to their footwall and hangingwall contacts with the hosting quartzite and conglomerate units of the Serra do Córrego, Rio do Ouro, and Serra da Paciência Formations. The mineralized shear zones are characterized by the development of gold-bearing quartz veins and/or stockwork. The main hydrothermal alteration types are silicification, fuchsitization, pyritization, and sericitization, with local tourmalinization. A number of examples of this group are known at the mine sites and surrounding areas (Canavieiras, Itapicurú, Serra do Córrego, Morro do Vento, and João Belo), and at Serra da Paciência (Mina Velha, Várzea Comprida, Ciquenta e Um, Cabeça de Nego and Milagres gold workings), in the north. This style of mineralization does not contribute significantly to the mineral resource at Jacobina.

ALTERATION
The overprinting hydrothermal alteration event at the Jacobina deposit consists of pyrite, pyrrhotite, quartz, chrome-sericite (fuchsite), chrome-rutile and chrome-tourmaline. The chromium-rich nature of this alteration assemblage is attributed to leaching of the maficultramafic intrusive rock by circulating hydrothermal fluids.


Mining Methods

  • Sub-level stoping


Summary:

Jacobina utilizes the sublevel longhole stoping (SLS) method without backfill to achieve an average production rate of approximately 6,500 tpd from the ramp-accessed underground mines; these include João Belo, Canavieiras, Serra do Córrego, Morro do Cuscuz, and Morro do Vento.

The SLS method uses fan drilling. Production drill holes vary from 76 to 112.5 mm in diameter and are drilled using three types of fan drills; these include the Solo 5 7F, the Solo DL 420, and the Solo DL 421. For the most part, drill holes are no longer than 25 m, which helps control deviation. Backfill is not required for the SLS mining method as the stopes are supported by pillars left in place. However, development waste is increasingly being deposited in underground voids.

The Phase 2 expansion is planned for completion in mid-2022 and will increase throughput to 8,500 tpd, raising annual production to 230,000 ounces by 2023. Beyond Phase 2, the Company plans to implement a Phase 3 expansion which, for a modest cost, would increase throughput to 10,000 tpd and raise annual production to 270,000 ounces.

Ramp access to the mineralized zones allows for a high degree of flexibility.

Yamana is reviewing alternative mining methods and testing the suitability of the Jacobina tailings for paste fill or hydraulic fill applications. The results will be considered in a conceptual study that will evaluate the potential for constructing a fill plant at Jacobina. The use of cemented rock fill is also being evaluated. Alternative mining methods and the use of backfill is likely to increase mining extraction and has the potential to increase conversion of measured and indicated mineral resources to mineral reserves.

Stope stability is typically controlled through modification of the stope length as a way to manage the hydraulic radius of the hangingwall. For long-term planning, a hydraulic radius of approximately 13 is typically used, resulting in stope dilution estimates of 10% to 20%. Shortterm planning dilution estimates are supported by the actual results of the reconciliation process.

The selection of ground support for temporary and permanent excavations depends on the class of the rock mass (geomechanical domain) in which they are located. Bolts; bolts and steel screen; or a combination of bolts, steel screen, and shotcrete are used. The bolts are the primary support element. They can be fixed with resin or cement cartridges and their spatial distribution varies in spacing and quantity according to the quality of the rock mass. Steel screens are installed in regions or areas of very fractured rocks to hold the rock blocks that form between the risers. Shotcrete is used in areas of extremely fractured rock, subject to popping or immediate rupture; its thickness can vary between 60 mm and 90 mm.

Primary ventilation of the underground mines at Jacobina is provided through the use of the main exhaust fans, ventilation raises, and ramps. Air is provided to the working faces through
the use of auxiliary fan with flexible and rigid ventilation ducting.

Dewatering of underground operations is completed via a system of sumps on each level which pump up to a main sump at the collar of the portals. This water is subsequently pumped to a
treatment basin where the pH is adjusted to the required level using caustic soda. Dewatering is carried out with 13 hp Flygt submersible pumps and 50 hp and 100 hp Weir-type
pumps, with 100 to 125 mm discharge lines being the standard.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1
Cone crusher 2
Cone crusher ....................... Subscription required 1
Ball mill 1
Ball mill 15' x 30' 1

Summary:

CRUSHING CIRCUIT
The ROM material is trucked to the crushing facilities located adjacent to the processing plant. The broken ore is passed through a grizzly (80% passing (P80) < 180 mm) and fed to the jaw crusher with a capacity of 942 t/h. The coarsely crushed material is then passed through secondary and tertiary cone crushers with a capacity of approximately 556 t/h. The secondary crusher reduces the size of the feed to P80 < 40 mm, and the tertiary crusher further reduces the feed to P80 < 8 mm.

GRINDING CIRCUIT
The crushed ore feeds the grinding circuit where ball mill/cyclone combinations are used to grind and classify the ore to prepare the feed for the leach circuit. The product of the crushing circuit is fed to storage silos and then conveyed to the ball milling circuit where ore is ground to a P80 < 150 µm. Ball mill product is classified in cyclones, with the cyclone underflow being returned to the ball mills, and the overflow forming the feed to the leach circuit. A portion of the cyclone underflow is processed through Knelson concentrators with concentrate pumped to Acacia Reactors. It is estimated that 60% of the gold in the plant is recovered by the concentrator/reactor combination. Cyclone overflow from the grinding circuit is pumped through trash screens to the pre-leach thickener followed by the leach tanks.


Processing

  • Gravity separation
  • ACACIA reactor
  • Centrifugal concentrator
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Phase 1 optimization project, whose objective was to stabilize throughput at a sustainable 6,500 tpd, was completed in June of 2020. The Company is now advancing the Phase 2 expansion at Jacobina, for an increase in throughput to 8,500 tpd. In 2021, the Company initiated a simplified approach to the Phase 2 expansion to continue incremental debottlenecking and operational improvements, without requiring an expansion of the grinding circuit as originally contemplated.

During the fourth quarter of 2021, Jacobina received the expansion permit, allowing throughput to increase to 10,000 tpd. Receipt of the permit not only marks a significant milestone in the Phase 2 ramp up to 230,000 ounces of gold per year, but also facilitates the future Phase 3 expansion to increase production up to 270,000 ounces per year.

PLANT
The Jacobina mineral processing plant uses conventional gold processing methodologies to treat run-of-mine (ROM) material from the underground mi ........

Recoveries & Grades:

CommodityParameter2021202020192018201720162015
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required96.396.395.794.5
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required2.32.22.172.17

Production:

CommodityUnits2022202120202019201820172016
Gold koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required145136120
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required2,298,631 t2,093,413 t2,007,572 t1,803,064 t
Tonnes processed  ......  Subscription required  ......  Subscription required2,254,793 t2,035,214 t1,978,409 t1,802,914 t
Daily processing rate  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at December 31, 2021:
Underground reserves are reported at variable cut-off grades by zone ranging from 0.92 g/t gold to 1.01 g/t gold.

Underground resources are reported at variable cut-off grades by zone ranging from 0.69 g/t gold to 0.76 g/t gold.

CategoryTonnage CommodityGradeContained Metal
Proven 28,910 kt Gold 2.17 g/t 2,015 koz
Probable 13,101 kt Gold 2.19 g/t 923 koz
Proven & Probable 42,011 kt Gold 2.18 g/t 2,938 koz
Measured 30,281 kt Gold 2.4 g/t 2,339 koz
Indicated 19,372 kt Gold 2.36 g/t 1,468 koz
Measured & Indicated 49,652 kt Gold 2.38 g/t 3,807 koz
Inferred 25,018 kt Gold 2.37 g/t 1,904 koz

Commodity Production Costs:

CommodityUnits2021202020192018201720162015
Cash costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 675 / oz
Cash costs Gold USD 649 / oz 701 / oz 692 / oz 788 / oz
All-in sustaining costs (sold) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 891 / oz
All-in sustaining costs (AISC) Gold USD 802 / oz 867 / oz 988 / oz 1,071 / oz
^ Guidance / Forecast.
Subscription required - Subscription is required.

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required21   21.7   35  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required47.5   45.1   46.1  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required179.4   170.8   145.5  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required192.3   27.4   18.8  
Subscription required - Subscription is required


Heavy Mobile Equipment as of December 31, 2019:
HME TypeQuantityLeased or
Contractor
Backhoe ....................... Subscription required Leased
Drill ....................... Subscription required Leased
Grader ....................... Subscription required Leased
Jumbo ....................... Subscription required Leased
Loader (FEL) ....................... Subscription required Leased
Load-Haul-Dump (LHD) ....................... Subscription required Leased
Scissor Lift ....................... Subscription required Leased
Shotcreter ....................... Subscription required Leased
Truck (haul) ....................... Subscription required Leased
Truck (water) ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Apr 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Apr 1, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... 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 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Annual Report 2018
Press Release 2018
Financial Review 2017
Management Discussion & Analysis 2017
Annual Report 2016
Annual Report 2015
Technical Report 2014
Subscription required - Subscription is required.

News:

NewsDate
Yamana Gold Reports Significant Progress on Phase 2 Expansion at Jacobina and Strong Exploration Results for the Operation; Costs to Complete Phase 2 Significantly Reduced... July 29, 2021
Yamana Gold Confirms Filing of Technical Report for Jacobina June 1, 2020
Yamana Gold Provides an Update on Its Phase 2 Jacobina Expansion Including a 31% Increase in Production ... May 6, 2020
Yamana Gold Increases Reserve Grade, Significantly Increases Reserves and Announces Further Positive Exploration Results at Jacobina Mine September 5, 2019

Aerial view:

Subscription required - Subscription is required.

Terms of Use Privacy Policy © 2017-2022 MDO Data Online Inc.