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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
  • Centrifugal concentrator
  • Filter press plant
  • Carbon re-activation kiln
  • Flotation
  • Inline Leach Reactor (ILR)
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life2021
The Palito and São Chico operations comprise a single cash generating units (“CGU’’), being the Palito Complex.

The release of the audited annual financial results for the year ended 31 December 2020 has been delayed. The delay is due to local audit issues in Brazil which the Company is working with its auditors to resolve. The Board currently expects that the audited results for 2020 will be issued during August 2021.
Latest NewsSerabi Gold plc: Audited Results for the year ended 31 December 2021     June 10, 2022


Owners

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

  • Intrusion related
  • Skarn
  • Mesothermal
  • Vein / narrow vein


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
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher ....................... Subscription required 620mm x 400mm 60 kW 1
Cone crusher 30 kW 3
Ball mill ....................... Subscription required 2.3m x 3.1m 340 kW 1
Ball mill ....................... Subscription required 2.1m x 3.4m 275 kW 2

Summary:

Crushing
Stockpiled run-of-mine (ROM) ore is fed to the crushing circuit at an average rate of 23 t/h using a front-end wheel loader. The ore is fed to a jaw crusher using a vibratory grizzly where it is crushed to a nominal size of 60 mm. A conveyor transports the primary crushed ore to a double-deck vibrating screen with a top deck screen size of 30 mm and a bottom deck screen size of 15 mm. The +30 mm material reports to the secondary crusher and the -30 mm+15 mm material reports to two tertiary crushers operating in parallel. The secondary and tertiary crushers are operated in closed circuit with the double-deck screen and are set to produce a product of less than 15 mm. The final minus 15 mm product is transported via a stacker conveyor to crushed ore stockpiles.

Due to the high variability of the Palito and São Chico ROM ore, material from each front and stope in both the mines is crushed separately on a batch basis and stockpiled individually. The crushed ore product from each batch is sampled as it falls onto the product conveyor. After analysis of each sample, the separate stockpiles are blended using a front-end wheel loader in such a way as to produce a consistent mill feed blend. The ore is blended as it is loaded into trucks, which are then weighed and transported to mill feed stockpiles.

Grinding
Palito and São Chico ores are transported and loaded into separate 200 t fine ore bins at the process plant. Both Palito and São Chico ore are weighed as they are conveyed to the grinding circuit and sampled every 30 minutes with automatic cross-cut samplers. Palito ore is fed to two ball mills (2.3 m diameter x 3.1 m long and 2.1 m diameter x 3.4 m long) operating in parallel and in closed circuit with 250 mm diameter cyclones to produce a final ground product size of 80% passing (P80) 120 µm which is then conditioned and fed to the copper flotation circuit. São Chico ore is fed to one ball mill (2.1 m diameter x 3.4 m long) operated in closed circuit with a Falcon SB-750B centrifugal concentrator and a 250 mm diameter cyclone to produce a final grind size of P80 120 µm which is advanced directly to the CIP cyanidation circuit along with the Palito copper flotation tailing.


Processing

  • Gravity separation
  • Smelting
  • Centrifugal concentrator
  • Filter press plant
  • Carbon re-activation kiln
  • Flotation
  • Inline Leach Reactor (ILR)
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • 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 carbonin- pulp (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 directly feeding this material 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 g ........

Recoveries & Grades:

CommodityParameter2019201820172016
Gold Recovery Rate, %  ......  Subscription required92.692.691.3
Gold Head Grade, g/t  ......  Subscription required7.057.118.11

Production:

CommodityProductUnits2022202120202019201820172016
Gold Metal in conc./ doré koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required373739
Copper Concentrate kt  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20202019201820172016
Ore tonnes mined  ......  Subscription required176.24 kt162.72 kt168.88 kt158.86 kt
Daily processing capacity  ......  Subscription required500 t
Tonnes milled  ......  Subscription required177,335 t168,253 t172,565 t158,966 t
Subscription required - Subscription is required.

Reserves at August 30, 2020:

CategoryTonnage CommodityGradeContained Metal
Proven & Probable kt Gold 7.5 g/t 72 koz
Measured & Indicated kt Gold 265 koz
Inferred kt Gold 218 koz

Commodity Production Costs:

CommodityUnits2019201820172016
Total cash costs Gold USD  ......  Subscription required† 821 / oz† 799 / oz† 700 / oz†
All-in sustaining costs (AISC) Gold USD  ......  Subscription required† 1,093 / oz† 1,071 / oz† 965 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

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

Financials:

Units2019201820172016
Capital expenditures M USD  ......  Subscription required4.4   4.4   2.4  
Revenue M USD  ......  Subscription required43.3   48.4   52.6  
Gross profit M USD  ......  Subscription required2.9   5   11.3  


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

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 10, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Jul 27, 2021
....................... Subscription required ....................... Subscription required Subscription required Jun 2, 2022
Subscription required - Subscription is required.

Staff:

EmployeesYear
Subscription required 2020
Subscription required 2019
Subscription required 2018
Subscription required 2017
Subscription required 2016

Corporate Filings & Presentations:

DocumentYear
Press Release 2022
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Report 2018
Technical Report 2018
Annual Report 2017
Subscription required - Subscription is required.

News:

NewsDate
Serabi Gold plc: Audited Results for the year ended 31 December 2021 June 10, 2022
Exploration Success Continues at Piaui Prospect March 18, 2022
Serabi Gold Reports Mineral Reserves and Resources for Palito Complex as at 31 December 2021 March 7, 2022
Serabi meets gold production guidance for 2021 January 24, 2022
Serabi Gold plc: Multiple high grade intercepts into the undeveloped Gabi Vein at Sao Chico offer significant resource growth potential December 21, 2021
Serabi Gold plc: Audited Results for the year ended 31 December 2020 September 27, 2021
Serabi Gold Plc.: Exploration drilling extends the newly developed Mogno and Ipe lodes May 11, 2021
Serabi Gold plc: Updated Mineral Reserves and Resources for Palito Complex as at December 2020 March 29, 2021
Serabi Gold Plc.: Accident at Palito Mine March 10, 2021
Serabi Gold Plc.: Issue of Equity March 1, 2021
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:

Subscription required - Subscription is required.

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