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Brazil
Lavrinha Mine (EPP Complex)

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 Location:
342 W from Cuiabá, Brazil

  Regional Office:
Faz Ernesto Soares de Carvalho - s/n
Pontes e Lacerda
Brazil
78250-000
Phone  ...  Subscription required
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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
Processing
  • Smelting
  • Gravity separation
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Cyanide (reagent)
Mine Life2.5 years (as of Jan 1, 2018)
On January 1, 2017, the Company declared commercial production at Lavrinha.


Owners & OPERATOR

Source: p. 47
CompanyInterestOwnership
Dinex Engenharia Mineral Ltda. (operator)
Aura Minerals Inc. 100 % Indirect
Aura has contracted the Brazilian company Dinex to mine the Lavrinha open pit Deposit. The major equipment in the fleet is specified as Volvo excavators, CAT dozers, Scania trucks and Sandvik drills. The contract term is 24 months, and is to be done by contract phase, with Phase I at 450kt/month to the end of April, 2017, and Phase II at 750kt/month to the end of mine life.

Deposit Type

  • Vein / narrow vein


Summary:

The Lavrinha Deposit which is closely linked to the Ernesto Deposit has been interpreted as gold-rich quartz veins and veinlets with coarse grained pyrite occurring along shallow-dipping structure. The main difference with Ernesto is the position of the mineralization in the metasedimentary sequence. Gold mineralization is located along quartz boudins in highly sericitized rock and plunges to the north.

The Ernesto-Lavrinha Deposits consists of gold- rich quartz veins and veinlets occurring along a relatively thick, shallow-dipping structure at the base of the metasedimentary sequence and within altered sulphidic horizons in overlying meta- arenite units. The basal structure is interpreted to be a low-angle detachment fault that has been folded and faulted together with the overlying stratigraphy. Gold mineralization is located along asymmetrical anticlines and synclines that plunge gently to the north and are cut by NW and NE- trending narrow faults. The gold mineralization occurs in three zones: Lower Trap, Middle Trap and Upper Trap.

The Upper Trap, which is widely developed in the Lavrinha Deposit, occurs in metapelitic rocks (hematite sericite schist) in dilation zones of the intensely deformed synclinal troughs. The Upper and Intermediate traps share similar alteration and mineralization suites.

The Ernesto-Lavrinha Deposits are described as detachment-style gold deposits, where typically gold mineralization is associated with low-angle to flat detachment faults, generally with a normal (extensional) sense of movement which consistently places younger units over older units.


Mining Methods


Summary:

Approximately 1.11 Mt of ore at an average grade of 1.69 g/t Au and 14.0 Mt of waste rock will be mined from the Lavrinha open pit over a 2.5 year period. The overall strip ratio for Lavrinha is 12.6:1 with mining conducted 365 days per year by a contractor. The contract is full service and includes providing all mining equipment, drilling, blasting, loading, hauling and maintenance. Total material movement rates for the LOM range from 15,000 to 25,000 tpd.

Conventional truck and hydraulic shovels will be utilized. Four excavators, supported by three front-end loaders, will load a fleet of ten 38- tonne trucks and five 25-tonne trucks. Ore will be transported to the primary crusher and run-of-mine (“ROM”) pad, and waste material will be hauled to a nearby waste rock storage facility.


Crushing and Grinding


Processing

  • Smelting
  • Gravity separation
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Ernesto gold processing plant is located next to the Ernesto Deposit and is designed to treat up to 1 Mtpy feed. The flowsheet is based on a low-risk proven technological configuration for processing gold bearing ore.

A primary crusher located at the front-end of the process plant. Run-of-mine (“ROM”) feed will be blended and fed through the plant’s primary screen. The screen oversize is crushed and the combined crushed feed is ground in a single-stage, closed-circuit semi-autogenous grinding (“SAG”) mill.

Approximately 25% of the SAG mill cyclone underflow feeds a gravity-gold recovery circuit. The grinding circuit product is thickened and then pumped to a leach tank that is followed by six carbon-in-leach (“CIL”) tanks in series. CIL tailings are treated in a cyanide reduction tank where cyanide is chemically decomposed. Final tailings are pumped to a tailings storage facility.

Loaded carbon, recovered from the first CIL tank, reports to the desor ........

Recoveries & Grades:

CommodityParameter20182017
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 1.131.15
Subscription required - Subscription is required.

Production:

CommodityUnits20182017
Gold oz  ......  Subscription required35,305
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20182017
Total tonnes mined  ......  Subscription required  ......  Subscription required
Ore tonnes mined  ......  Subscription required  ......  Subscription required
Waste  ......  Subscription required  ......  Subscription required
Stripping / waste ratio  ......  Subscription required  ......  Subscription required
Tonnes processed  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 55,490 t Gold 1.69 g/t 3,000 oz
Probable 974,880 t Gold 1.04 g/t 32,600 oz
Proven & Probable 1,030,370 t Gold 1.07 g/t 35,600 oz
Measured 40,620 t Gold 2.36 g/t 3,080 oz
Indicated 748,580 t Gold 1.43 g/t 34,420 oz
Measured & Indicated 789,200 t Gold 1.48 g/t 37,500 oz
Inferred 1,550 t Gold 1.16 g/t 60 oz

Commodity Production Costs:

CommodityUnits20182017
Cash costs Gold USD  ......  Subscription required 778 / oz
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of July 31, 2016:
HME TypeModelSizeQuantity
Backhoe ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 3
....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required 1
....................... Subscription required ....................... Subscription required 1
....................... Subscription required 3
....................... Subscription required 4
....................... Subscription required ....................... Subscription required 5
....................... Subscription required ....................... Subscription required 10
Subscription required - Subscription is required.

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Feb 1, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Annual Information Form 2017
Management Discussion & Analysis 2017
Feasibility Study Report 2016
Subscription required - Subscription is required.

Aerial view:

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