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Brazil
Xavantina (NX Gold) Mine

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 Location:
15 km NW from Nova Xavantina, Brazil

  Address:
Estrada do Garimpo do Araés, Km 18, s/n - Zona Rural
Nova Xavantina
Brazil
78690-000
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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
  • Silver
Mining Method
  • Underhand Cut & Fill
  • Room-and-pillar
  • Cemented backfill
  • Paste backfill
Production Start...
Mine Life2028
The Xavantina Operation is amongst the highest-grade gold mines in South America.


Owners

Source: p. 11
CompanyInterestOwnership
Ero Copper Corp. 97.6 % Indirect
NX Gold S.A. (operator) 100 % Direct
Ero Copper Corp. indirectly holds approximately 97.6% of the voting shares of NX Gold S.A. (“NX Gold”) through its wholly-owned subsidiary, Ero Gold Corp., incorporated under the BCABC. NX Gold holds a 100% interest in the NX Gold Mine.

Contractors

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Deposit Type

  • Vein / narrow vein
  • Metamorphic hosted


Summary:

The geology of the property can be characterized by strongly deformed volcano-sedimentary rocks altered to greenschist metamorphic grade. Gold mineralization is structurally controlled and hosted in sulphide-bearing, laminated shear veins that cross-cut the previously deformed and metamorphosed volcanic and sedimentary rock. The laminated nature of the veins indicates multiple pulses of quartz intruding a shear zone.

The characteristics of the gold mineralization at Xavantina are similar to orogenic gold described by Groves et al. 1998. Those deposits represent the main source of gold in deformed Precambrian metavolcanic environments and are characterized by high gold grades that range from 5 grams per tonne to over 10 grams per tonne and are hosted in quartz-carbonate veins associated with shear zones. Well-known examples of important gold deposits of this type include the Yilgarn Craton in Australia (Golden Mile and Norseman mines) and the Superior Province in Canada (McIntyre-Hollinger and Kerr-Addison mines).

The rock units present within the Xavantina Operations belong to the Nova Xavantina Volcano-Sedimentary Sequence as defined by Pinho (1990), part of the upper regional Cuiabá Group.

In subsequent geological classification surrounding the mining area, the Nova Xavantina Volcano-Sedimentary Sequence was renamed the Araés Volcano-Sedimentary Sequence and was further subdivided into three lithological associations (Martinelli et al. 1997; ........


Mining Methods

  • Underhand Cut & Fill
  • Room-and-pillar
  • Cemented backfill
  • Paste backfill


Summary:

The mining methods currently used at the Santo Antônio, and envisioned for the Matinha vein beginning in the second half of 2023, are a combination of inclined room and pillar and cut and fill using paste fill as backfill. Prior to commencing operations within the Santo Antônio vein, the mine employed a combination of inclined room and pillar and cut and fill, with backfill requirements generated from waste development. Mining method selection has been based upon desired selectivity, geometry of the orebodies (both planned and previously mined), geotechnical characteristics of the quartz vein as well as the footwall and hanging wall.

For the purposes of the current Mineral Reserve and life-of-mine production plan, the Santo Antônio vein has been divided into two main panels on -65 (upper) and -170 (lower) based upon the relative geomechanical strength characteristics of these zones. In the upper panel, cut and fill utilizing paste backfill will be employed, while inclined room in pillar, the current mining method, will be employed in the lower panel down to level -350. The deeper portion of Santo Antônio and Matinha veins will be mined using ascending cut and fill. Cemented paste will be employed in the lower panel to enhance pillar recovery following primary panel extraction. The mine is currently operating within the Santo Antônio vein using the selected mining methods.

The cut and fill method relies upon removing the ore in horizontal slices, advanci ........


Crushing and Grinding
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Processing

Flow Sheet: Subscription required

Summary:

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^ Guidance / Forecast.

Production:

CommodityUnits2023202220212020201920182017
Gold oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required39,80825,287
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré. ^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202320222021202020192018
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required162,642 t158,275 t117,857 t
Annual milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required300,000 t
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required162,642 t154,271 t119,469 t
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at October 31, 2022:
Mineral Reserve cut-off grades and parameters applied to the Mineral Reserve estimate: 4.17 gpt applied to mining stopes, in both room and pillar and cut and fill mining areas, incorporating mining and development, processing, general and administrative and indirect costs; 0.80 gpt applied to gallery development incorporating development and processing costs; and, 3.23 gpt applied to mining marginal material adjacent to planned mining stopes incorporating mining, development and processing costs.

Mineral Resources were constrained using a minimum stope dimension of 2.0 meters by 2.0 meters by 1.50 meters and a cut-off of 1.20 gpt based on gold price of US$1,900 per ounce of gold and total underground mining and processing costs of US$72.0 per tonne of ore mined and processed.

CategoryTonnage CommodityGradeContained Metal
Proven 301 kt Gold 10.89 g/t 105.4 koz
Probable 1,012 kt Gold 7.88 g/t 256.2 koz
Proven & Probable 1,313 kt Gold 8.57 g/t 361.6 koz
Measured 246.4 kt Gold 13.35 g/t 105.8 koz
Indicated 1,019 kt Gold 10.09 g/t 330.6 koz
Measured & Indicated 1,265 kt Gold 10.73 g/t 436.4 koz
Inferred 441.1 kt Gold 8.48 g/t 120.2 koz

Commodity Production Costs:

CommodityUnits2023202220212020201920182017
Credits (by-product) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
All-in sustaining costs (AISC) Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
C1 cash costs Gold USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 520 / oz†   790 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2023202220212020201920182017
Capital expenditures (planned) M USD  ......  Subscription required
Growth Capital M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 48.4   32.8  
Gross profit M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 16.1   5.1  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 10.1   0.03  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 6   -0.8  
Subscription required - Subscription is required


Water Supply
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Heavy Mobile Equipment as of October 31, 2022:
HME TypeModelSizeQuantityLeased or
Contractor
Backhoe ....................... Subscription required ....................... Subscription required
Drill jumbo (single boom) ....................... Subscription required ....................... Subscription required
Drill jumbo (two boom) ....................... Subscription required ....................... Subscription required
Grader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Loader ....................... Subscription required ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required
Load-Haul-Dump (LHD) 3 cu. m Leased
Load-Haul-Dump (LHD) ....................... Subscription required ....................... Subscription required
Shotcreter ....................... Subscription required ....................... Subscription required
Telescopic Handler ....................... Subscription required ....................... Subscription required
Trans Mixer ....................... Subscription required ....................... Subscription required
Truck (dump) ....................... Subscription required 20 t ....................... Subscription required Leased
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jul 19, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 19, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 19, 2023
....................... Subscription required ....................... Subscription required Subscription required Jul 19, 2023
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2022
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required 2019
Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2023
Annual Information Form 2022
Annual Report 2022
Press Release 2022
Technical Report 2022
................................... 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
Financial Review 2018
Management Discussion & Analysis 2018
Technical Report 2018
Subscription required - Subscription is required.

Subscription required - Subscription is required.

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