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Brazil
Palito Complex Mine

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 Location:
92 km NW from Novo Progresso, Brazil

  Address:
Rodovia Transgarimpeira, km 22
Bairro Jardim do Ouro
Brazil
68181-000
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
  • Copper
Mining Method
  • Shrinkage stoping
  • Longhole stoping
Processing
  • Gravity separation
  • Smelting
  • Flotation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2021
The Palito Complex comprises the Palito deposit and adjacent process plant together with the São Chico deposit located 25 kilometres to the south west.
Latest NewsSerabi reports improving gold production for the fourth quarter of 2020.     January 14, 2021


Owners & OPERATOR

Source: p. 11
CompanyInterestOwnership
Serabi Gold Plc. 100 % Indirect
Serabi Mineração S.A. (operator) 100 % Direct
The Palito Mining Complex is formed by 48,846 ha of tenements, including 1,150 ha of mining concession. In addition, there are 6,369 ha in mineral exploration license application and 1,416 ha in mining concession application resulting in a total area for this property of 56,631 ha. The mining concession and exploration licenses are issued to Serabi Mineração S.A., which is the wholly owned Brazilian subsidiary of Serabi Gold plc.

Deposit Type

  • Vein / narrow vein
  • Saprolite
  • Intrusion related


Summary:

The Palito and São Chico gold deposits are located within the northern portion of the Tapajós-Parima Orogenic Belt (TPOB), a constituent of the Ventauri-Tapajós province of the Guaporé Shield. Formed between 2.5 and 1.8 Ga, the TPOB is a northwest oriented magmatic arc bound to the north by the Amazonian Basin and to the south by the Cachimbo Graben. Within the TPOB, the Tapajós Gold Province hosts numerous primary gold deposits over an area of approximately 300 kilometers (km) by 350 km.

Mineralization at the Palito and São Chico deposits is hosted in granite and granodiorite of the Paráuari suite. Mineralization at the Palito Mine is hosted within three granitoids and is intimately associated with northwest-southeast vertical to sub-vertical mesothermal quartz-chalcopyrite-pyrite veins and pyrite disseminations filling the brittle-ductile fault sets. At Palito, the nature of sulfide mineralization varies along the strike and plunge extents of the deposit. Pyrite and chalcopyrite dominate in the granites, whereas pyrrhotite and pyrite with lesser chalcopyrite are found in the granodiorite. Within the granodiorites, the pyrrhotite-pyrite sulfides tend to be lower grade due to lower chalcopyrite content.

The Main Vein at São Chico strikes in a broadly west-northwest direction, dips steeply to the south, and ranges from approximately 1.0 to 3.9 meters (m) in apparent width. Mineralization extends approximately 140 m down dip and approximately 100 m along strike, and is open down dip and plunging to the west; to the east, mineralization is open for a minimum of 80 m along strike. The fault zone is variably mineralized, with both sinuous and regular quartz veining, pyrite, sphalerite, galena, chalcopyrite and electrum.

Gold deposits in the Tapajós Gold Province can be broadly classified into three main types:
- Mesozonal deposits;
- Epizonal intrusion centered or intrusion related deposits; and
- Alluvial, colluvial and supergene enriched saprolitic deposits.

The mineralogy and textures of the deposits at the Palito Mining Complex is consistent with a model for an intrusion related mesothermal gold-copper mineralization. This relatively new classification of gold deposits is associated with granitic rocks and are best developed above and surrounding small, granitic intrusions. Mineralization styles can manifest as stockworks, breccia, skarns and lode style veins, and have a clear metal association zonation.


Mining Methods

  • Shrinkage stoping
  • Longhole stoping


Summary:

Palito Mine
Mining of the narrow, near-vertical gold veins at the Palito Mine is undertaken using the shrinkage stoping method.

Shrinkage stoping blocks are defined on the lower level by horizontal development mining along the vein, and a vertical raise is then driven to the top of the stoping block and ladders are installed so that men and materials can access the stope on each subsequent lift as mining advances upward.

Shrinkage stope mining progresses vertically beginning with the drilling of sub-vertical holes using hand-held pneumatic drills (stopers). The drill holes are loaded with explosives and the blasted ore is left in the stope except to the extent it is necessary to draw down the rock to leave an adequate distance between the working floor and the back. The ore left in the stope supports the walls and no installed ground support is typically required. Serabi extracts the broken ore via a series of crosscuts that are driven in waste from a footwall access. After a stope is mined to its full height, load-haul-dump (LHD) units are used to muck the remaining ore from the stope. The LHD units load haul trucks, which then transport the broken ore to the surface.

São Chico Mine
The São Chico Mine is high grade, narrow vein longhole stoping operation. Mining of the steeply dipping vein is by longitudinal longhole stoping methods using sublevels that are spaced at a nominal 15 m. Because structural backfill is not available and because mining takes place on multiple adjacent levels, rib and sill pillars are used to separate the ore blocks and maintain geotechnical stability. The top and bottom of each stope block is mined with horizontal development using a drift cross-section of 3.5 m high by 3.5 m wide. Longholes are drilled between levels and blasthole rings are fired in the direction of a conventionally driven slot raise that is mined on one end of the stope. Ore is mucked from the longhole stopes using LHDs. The LHDs load haul trucks, which then transport the broken ore to the surface. Once the ore reaches the surface, it is transported by road (approximately 30 km) from the São Chico Mine to the processing plant at the Palito site.

Underground Mine Access
A 4.5 m high x 4.5 m wide ramp system (-12% gradient) provides access to the underground portions of the Palito and São Chico mines. The portal at the Palito Mine is located at elevation 235 meters above sea level (masl), and the deepest level is -50 masl. At São Chico, the portal is located at elevation 224 masl, and the deepest level is currently 10 masl.


Crushing and Grinding


Processing

  • Gravity separation
  • Smelting
  • Flotation
  • Agitated tank (VAT) leaching
  • Concentrate leach
  • Carbon in pulp (CIP)
  • Elution
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

Serabi operates a 500 t/d plant to process ore from both the Palito and São Chico mines. Palito ore is processed through a flowsheet that includes crushing, grinding, copper flotation and CIP cyanidation of gold and silver values from the copper flotation tailing. The São Chico ore is processed in a separate grinding circuit that includes gravity concentration and intensive cyanide leaching of the gravity concentrate. The São Chico gravity tailing is combined and processed with the Palito copper flotation tailing in the CIP cyanidation circuit. In addition to Palito and São Chico ore, old flotation tailing stockpiles, which contain about 2.6 to 3.6 g/t Au, are processed by direct feedi into the CIP circuit. Gold and silver values extracted in the CIP circuit are adsorbed onto activated carbon. The “loaded” carbon is then eluted to remove the adsorbed gold and silver values into an upgraded solution that flows through electrowinning cells to recover gold and silver as a cathodic precipi ........

Recoveries & Grades:

CommodityParameter2019201820172016
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 7.027.057.118.11
Subscription required - Subscription is required.

Production:

CommodityProductUnits20202019201820172016
Gold Metal in conc./ doré oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required37,00439,390
Copper Concentrate wmt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics2019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required158,864 t
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required158,966 t
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Reserves at June 30, 2017:

CategoryTonnage CommodityGradeContained Metal
Proven 402 kt Gold 107 koz
Proven 337 kt Copper 0.36 % 1,219 t
Probable 301 kt Gold 75 koz
Probable 276 kt Copper 0.39 % 1,076 t
Proven & Probable 703 kt Gold 181 koz
Proven & Probable 613 kt Copper 0.37 % 2,295 t
Measured 406 kt Gold 166 koz
Measured 346 kt Copper 0.61 % 2,110 t
Indicated 393 kt Gold 140 koz
Indicated 371 kt Copper 0.57 % 2,115 t
Measured & Indicated 799 kt Gold 307 koz
Measured & Indicated 717 kt Copper 0.59 % 4,225 t
Inferred 907 kt Gold 231 koz
Inferred 784 kt Copper 0.2 % 1,568 t

Commodity Production Costs:

CommodityUnits2019201820172016
Total cash costs Gold USD  ......  Subscription required†  ......  Subscription required† 799 / oz† 700 / oz†
All-in sustaining costs (AISC) Gold USD  ......  Subscription required†  ......  Subscription required† 1,071 / oz† 965 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2019201820172016
UG mining costs ($/t mined) USD 120125112110
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units2019201820172016
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required


Heavy Mobile Equipment as of January 25, 2018:
HME TypeModelSizeQuantity
Drill (long hole) ....................... Subscription required 1
Jumbo ....................... Subscription required 4
Load-Haul-Dump (LHD) ....................... Subscription required 3 t 7
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 23, 2020
....................... Subscription required ....................... Subscription required Subscription required May 23, 2020
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Subscription required - Subscription is required.

News:

NewsDate
Serabi reports improving gold production for the fourth quarter of 2020. January 14, 2021
Audited Results for the year ended 31 December 2019 April 9, 2020
Audited Results for the year ended 31 December 2019 April 9, 2020
Step out drilling at Sao Chico significantly extends resource beyond current mine limits March 3, 2020
Step out drilling at Sao Chico significantly extends resource beyond current mine limits January 6, 2020

Aerial view:

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