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Spain
OroValle/El Valle Operation

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 Location:
43 km SW from Aviles, Spain

  Address:
Planta El Valle Boinás, 33836, Begega, Belmonte de Miranda, Principado de Asturias
Spain
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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
  • Copper
Mining Method
  • Drift & Fill
  • Transverse stoping
  • Longitudinal stoping
  • Cemented backfill
  • Dry waste backfill
Production Start...
Mine Life5 years (as of Jan 1, 2021)
El Valle Boinás and Carlés gold-copper-silver mines along with the El Valle processing plant and El Valle tailings storage facility (TSF), collectively, the El Valle Operation.

The El Valle Operation recommenced commercial production in August 2011. The Orovalle Operation consists of underground mines at Boinás and Carlés and an open pit at Carlés. Currently the Boinás underground mine is the only producing asset. Both Carlés mines are currently on care and maintenance with underground production planned to recommence in the near future.
Latest NewsOrvana Reports FY2022 Results & FY2023 Guidance     December 19, 2022


Owners

Source: p. 10
CompanyInterestOwnership
Orvana Minerals Corp. 100 % Indirect
OroValle Minerals S.L. (operator) 100 % Direct
Through its wholly-owned subsidiary, Orovalle Minerals S.L. (“Orovalle”), Orvana Minerals Corp. owns and operates the El Valle and Carlés mines.

Contractors

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Deposit Type

  • Skarn
  • Breccia pipe / Stockwork


Summary:

Gold-copper skarns have developed mainly along the contact between intrusives and carbonate units. Two different types of skarn have been recognised at El Valle-Boinás. The first is a calcic skarn related to limestone units and the second is a magnesian skarn, called “black skarn”, that is related to dolomite units.

The gold-copper bearing skarns at Carlés are generally calcic skarns. Better grade goldcopper mineralisation is associated with high magnetite and bornite content that is localised in generally continuous, relatively thin (four metres thick) layers of retrograde skarn.

At the El Valle-Boinás deposit, reactivation of fracture zones (along northeast-southwest, eastwest, and northwestsoutheast orientations) produced widespread brecciation and favoured the emplacement of porphyritic dykes. A low temperature alteration and mineralisation event is spatially and genetically associated with the subvolcanic porphyry dykes, which overprint all previous lithologies. Depending on the host rock, there are different styles of hydrothermal alteration and mineralisation, such as: sericite-adularia-carbonates (+py-aspy) in granites and skarns; leaching, enrichment, and silicification in skarns (+ native copper and chalcocite); and silicification (+py) in dolomites.

Highest gold grades occur where the low temperature mineralisation overprints previously mineralised gold-copper skarn, forming jasperoid or semi-jasperoids with native copper and minor ........


Mining Methods

  • Drift & Fill
  • Transverse stoping
  • Longitudinal stoping
  • Cemented backfill
  • Dry waste backfill


Summary:

The Orovalle Operation consists of underground mines at Boinás and Carlés and an open pit at Carlés. Currently the Boinás underground mine is the only producing asset, with a nominal mining rate of 2,000 tpd. Both Carlés mines are currently on care and maintenance with underground production planned to recommence in the near future.

The current mining methods used at Boinás underground mine are overhand D&F and transverse and longitudinal longhole SLS. The D&F mining method is utilised in oxides and some transitional areas of the Boinás mine. Longitudinal SLS is used exclusively in the more competent skarns. The Carlés mine is planned to utilise both SLS methods underground, where the orebody dip is suitable, and D&F where the orebody dip is too shallow for SLS mining. Should the open pit at Carlés recommence production, then a conventional drill and blast, truck and shovel method will be used.

Access is typical for SLS methods, with an upper drill drift and lower mucking drift. Cable bolting is carried out to support the hanging wall and help reduce dilution. In Boinás there are primary and secondary stopes. Primary stopes are backfilled with cemented rock fill (CRF) and secondary stopes are backfilled with uncemented rock fill (URF). In Carlés all the stopes will be backfilled with URF. Waste suitable for CRF production will be hauled to surface where it is screened and mixed with 4% cement before being transported back underground in trucks for pla ........


Crushing and Grinding
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Processing

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Summary:

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Production:

CommodityProductUnits2022202120202019201820172016
Gold Metal in conc./ doré oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required58,25951,54644,682
Copper Metal in concentrate k lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in conc./ doré oz  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202120202019201820172016
Ore tonnes mined  ......  Subscription required  ......  Subscription required713,818 wmt647,852 wmt733,086 wmt479,077 wmt
Tonnes milled  ......  Subscription required  ......  Subscription required658,046 dmt623,137 dmt707,362 dmt452,003 dmt
Daily milling rate  ......  Subscription required  ......  Subscription required1,898 dmt1,830 dmt2,040 dmt1,235 dmt
Daily ore mining rate  ......  Subscription required  ......  Subscription required
Daily processing capacity  ......  Subscription required  ......  Subscription required2,000 dmt2,000 dmt2,000 dmt2,000 dmt
Subscription required - Subscription is required.

Reserves at September 30, 2021:
Mineral Resources are estimated at gold equivalent ("AuEq”) cut-off grades of 2.48 g/t for Boinás
oxides, 2.11 g/t for Boinás skarns and 1.96 g/t for Carlés. AuEq cut-off grades of 2.48 g/t was used for La Brueva.

Mineral Reserves are estimated using AuEq break-even cut-off grades by zone, consisting of 3.35 g/t AuEq for Boinás oxides (D&F), 2.90 g/t AuEq for Boinás skarns (SLS), and 2.09 g/t AuEq for Carlés skarn (SLS).

CategoryTonnage CommodityGradeContained Metal
Proven 1,327 kt Gold 2.71 g/t 116 koz
Proven 1,327 kt Silver 9.02 g/t 385 koz
Proven 1,327 kt Copper 0.43 % 12,574 k lbs
Probable 1,997 kt Gold 3.25 g/t 209 koz
Probable 1,997 kt Silver 4.2 g/t 270 koz
Probable 1,997 kt Copper 0.28 % 12,324 k lbs
Proven & Probable 3,324 kt Gold 3.04 g/t 324 koz
Proven & Probable 3,324 kt Silver 6.13 g/t 655 koz
Proven & Probable 3,324 kt Copper 0.34 % 24,898 k lbs
Measured 4,767 kt Gold 3.12 g/t 478 koz
Measured 4,767 kt Silver 13.66 g/t 2,094 koz
Measured 4,767 kt Copper 0.59 % 62,249 k lbs
Indicated 5,572 kt Gold 4.05 g/t 728 koz
Indicated 5,572 kt Silver 7.14 g/t 1,279 koz
Indicated 5,572 kt Copper 0.37 % 45,337 k lbs
Measured & Indicated 10,340 kt Gold 3.62 g/t 1,205 koz
Measured & Indicated 10,340 kt Silver 10.15 g/t 3,373 koz
Measured & Indicated 10,340 kt Copper 0.47 % 107,586 k lbs
Inferred 3,684 kt Gold 3.74 g/t 466 koz
Inferred 3,684 kt Silver 7.04 g/t 852 koz
Inferred 3,684 kt Copper 0.32 % 25,838 k lbs

Commodity Production Costs:

CommodityUnits2022202120202019201820172016
Cash costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,129 / oz†   1,293 / oz†   1,172 / oz†  
All-in sustaining costs (sold) Gold USD  ......  Subscription required ^†  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,331 / oz†   1,574 / oz†   1,468 / oz†  
All-in costs Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,331 / oz†   1,574 / oz†   1,468 / oz†  
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 6.5   9.7   9.5  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 80.2   71.6   59.5  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required -9.4   -20.9   -9.8  
Subscription required - Subscription is required


Pipelines
TypeMaterialDiameterLengthDescription


Heavy Mobile Equipment as of November 30, 2020:
HME TypeModelSizeQuantity
Bolter ....................... Subscription required 63 kW ....................... Subscription required
Bolter ....................... Subscription required 62 kW ....................... Subscription required
Concrete sprayer ....................... Subscription required 10 t ....................... Subscription required
Drill (long hole) ....................... Subscription required 70 kW ....................... Subscription required
Drill (long hole) ....................... Subscription required 150 kW ....................... Subscription required
Hammer crusher ....................... Subscription required 39 kW ....................... Subscription required
Hammer crusher ....................... Subscription required 54 kW ....................... Subscription required
Jumbo ....................... Subscription required 125 kW ....................... Subscription required
Jumbo ....................... Subscription required 79 kW ....................... Subscription required
Jumbo ....................... Subscription required 135 kW ....................... Subscription required
Jumbo ....................... Subscription required 90 kW ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required 14 t ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required 10 t ....................... Subscription required
Load-Haul-Dump (LHD) ....................... Subscription required 10 t ....................... Subscription required
Truck (dump) ....................... Subscription required 20 t ....................... Subscription required
Truck (dump) ....................... Subscription required 25 t ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Nov 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 3, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 3, 2022
Subscription required - Subscription is required.

Staff:

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

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Corporate Presentation 2018
Management Discussion & Analysis 2018
Press Release 2018
Corporate Presentation 2017
Management Discussion & Analysis 2017
Press Release 2017
Management Discussion & Analysis 2016
Technical Report 2014
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News:

NewsDate
Orvana Reports FY2022 Results & FY2023 Guidance December 19, 2022

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