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Brazil
Pau-a-Pique Mine (EPP Complex)

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 Location:
321 W from Cuiabá, Brazil

  Regional Office:
Faz Ernesto Soares de Carvalho - s/n
Pontes e Lacerda
Brazil
78250-000
Phone  ...  Subscription required
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeUnderground
Commodities
  • Gold
Mining Method
  • Avoca
Processing
  • Gravity separation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2020


Owners & OPERATOR

Source: p. 25
CompanyInterestOwnership
Aura Minerals Inc. 100 % Indirect
Mineracao Apoena Limitada (operator) 100 % Direct

Deposit Type

  • Vein / narrow vein
  • Orogenic


Summary:

The Pau-a-Pique Deposit occurs in close association with the contact of the meta-tonalite basement and the overlying Aguapeí Group metasediments. The tonalite is metamorphosed with a foliated structure, but preserving the original igneous texture. The rocks are metamorphosed and deformed under lower green-schist facies conditions. Muscovite schist is developed in the contact between the metatonalites and metasediments and is an important host of mineralization. The muscovite schist has S-C structures and abundant shear bounded sigmoidal veins. The schist has a strong stretching lineation oriented at N20–50W that controls the form of the deposit and sub-surface mineralization.

The Pau-a-Pique Deposit is developed within brecciated-sheared host rocks which are strongly foliated and moderately metamorphosed and can be described as structurally controlled orogenic gold lode deposit.

The Pau-a-Pique gold mineralization is associated with the intensity of the hydrothermal alteration, and is proportional to the occurrence of pyrite, sulphide alteration, quartz veins and sericitization. Pyrite generally occurs in fresh rock, and at the exposed zones in the old pit there is a predominance of oxidized pyrites, products of surface weathering.

In the deeper levels (PQ-12), the most common hydrothermal alteration with gold enrichment is strong albite-anorthosic quartz veining associated with chloritization and pyrite. While in shallow levels (PQ-01, 02), the most pervasive alteration is silicification, represented by a strong injection of quartz veins and weaker gold enrichment. The albitic alteration probably represents deeper and hot sources of the hydrothermal feeder.

The envelope of the mineralized zone is approximately 550 m long, maximum of 15 m wide and 400 m deep in the largest extension (NW down plunge). The occurrence is confined to the contact between Aguapeí metasediments and the tonalite, which is the main prospective guide to the deposit, in addition to the NW plunge that can be seen in the longitudinal section.

In the NW down-plunge zone, gold enrichment associated with albitic-anorthosic metasomatism, pyrite, chlorite and magnetite is abundant. Alteration is wide and extensive and developed in contact with tonalite and conglomerate and within the sheared and deformed tonalite. The presence of sulphide and magnetite in sheared host rocks is favorable for gold enrichment with higher grade. Strong metasomatism which is developed mainly in contact and within hangingwall tonalite shows higher temperature mineral assemblage which represent a hyrothermal feeder for ascending metasomatic fluids.


Mining Methods

  • Avoca


Summary:

Mining at Pau-a-Pique will be conducted by a modified Avoca choke blast stoping method with ore transported to the ROM pad on surface by 30 tonne haulage trucks operating through the main ramp. Ore will be subsequently hauled on a 47 km surface road to the Ernesto processing plant. Primary access to the underground mine is via a single portal located next to the main mining office.

Approximately 0.32 Mt of ore at an average grade of 3.24 g/t Au will be mined over a 17 month period at an average of 850 tpd when the Project achieves full production. Once the deposit has been depleted most of the equipment and operators will be transferred to the Ernesto operation.

The stoping method applied to the Area 7 and Area 8, NW, and P3 and P4 ore bodies will be via Hanging Wall (“HW”) access ore drives with levels spaced at 15 m and 21 m vertical intervals, for the upper and lower areas of the deposit, respectively. The upper and lower areas will be separated by a sill pillar. Unconsolidated waste rock will be used to backfill the stopes.

The majority of underground mining activities will utilize Aura’s employees, with external contractors or suppliers to undertake the supply of explosives, piping and services, ground support consumables, truck haulage underground and on surface and other specialized tasks (i.e. site security, doré bar transportation, etc.). Aura has 100% ownership of all major fixed plant components utilized at the mine.


Crushing and Grinding


Processing

  • Gravity separation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in leach (CIL)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • 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 2.82.58
Subscription required - Subscription is required.

Production:

CommodityUnits20182017
Gold oz  ......  Subscription required9,855
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 51,981 t Gold 2.12 g/t 3,544 oz
Probable 192,952 t Gold 1.72 g/t 10,649 oz
Proven & Probable 244,934 t Gold 1.8 g/t 14,193 oz
Measured 105,260 t Gold 3.81 g/t 12,910 oz
Indicated 528,600 t Gold 3.17 g/t 53,820 oz
Measured & Indicated 633,860 t Gold 3.27 g/t 66,730 oz
Inferred 85,900 t Gold 2.93 g/t 8,100 oz

Commodity Production Costs:

CommodityUnits20182017
Cash costs Gold USD  ......  Subscription required 1,317 / oz
Subscription required - Subscription is required.


Proposed Heavy Mobile Equipment as of July 31, 2016:
HME TypeModelSizeQuantity
Drill (long hole) 2
....................... Subscription required 1
....................... Subscription required ....................... Subscription required 3
....................... Subscription required 1
....................... Subscription required ....................... Subscription required 2
....................... Subscription required ....................... Subscription required 3
Subscription required - Subscription is required.

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Feb 25, 2020
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... 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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