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Nicaragua
Pavon Expansion Project (Pavon)

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 Location:
65 km NE from Matagalpa, Nicaragua

  Project Contacts:
Residencial Las Colinas, Kinder Montessori 1 C. al E, 1 C. al N, 80 mts al E, #273
Managua
Nicaragua
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WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StagePermitting
Mine TypeOpen Pit
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Smelting
  • Carbon re-activation kiln
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life4 years (as of Jan 1, 2021)
Calibre is advancing development and permitting at Pavon Central with the objective of commencing mining by 2023.
Latest NewsCalibre Mining Receives Environmental Permit for Development and Operation of the High-Grade Pavon Central Open-Pit Mine Expected to Drive Production Increase in 2023     June 16, 2022


Owners

Source: p. 15
CompanyInterestOwnership
Calibre Mining Corp. 100 % Indirect
The property is currently held 100% by Calibre, through its Desarrollo Minero de Nicaragua, S. A. (DESMINIC) subsidiary.

Deposit Type

  • Vein / narrow vein
  • Breccia pipe / Stockwork


Summary:

All the major veins identified on the Pavón concessions are hosted by intermediate to felsic rocks within the Matagalpa Group sequence. Rhyolite tuffs and flows overlying the sequence appear to be syn- to post-mineral and have been mapped regionally as part of the Lower Coyol Group.

Potentially economic gold-silver mineralization at Pavón is hosted within quartz veins, and stockwork veinlets, and quartz vein breccia with textures and alteration assemblages typical of formation in a low sulphidation epithermal environment. Many of the veins display multiple stages of quartz deposition and both tectonic to hydrothermal brecciation. Brecciated veins are more common than massive fissure veins in the Pavón area.

Quartz vein textures vary both within individual veins, and between veins across the concession. Common quartz textures include granular (locally gray with fine-grained disseminated pyrite), massive, and banded clear, gray, and blue chalcedonic. Coarsely crystalline or massive quartz, cockscomb, and cockade textures are less common suggesting most of the multi-phase quartz was deposited at lower epithermal temperatures (Hawksworth, 2005).

Adularia is an important vein component of the Pavón Norte, Pavón Central, and Pavón Sur deposits. It occurs as millimetre-wide growth rims with banded massive, granular, or chalcedonic quartz, and locally as radiating crystals extending up to 1.0 cm into the quartz bands. Examination of drill logs shows a general correlation of gold with total quartz volume percent and adularia percent. Sulphides within the quartz veins are rare. Pyrite occurs within grey silica/quartz that forms the late stage hydrothermal breccia matrix which is generally the last vein event within the major structures. Trace amounts of base metal sulphide have been observed within select holes.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The proposed mine development includes two open pits (Norte and Central), separated by approximately three kilometres. Mine production will consist of up to 3.6 Mtpa and 6.6 Mtpa (ore and waste) for Pavón Norte and Central respectively.

Overall slope angles are determined by the geotechnical slope parameters. The theoretical slope angles are then reduced as required to accommodate haulage ramps and berms. These adjusted slope parameters are incorporated within the optimization package to reflect the final wall slope configuration and minimize the variance between the optimized shapes and actual design.

The final pit limits were established from the base case LG pit optimization. Design pits are complete with haul roads and adhere to the recommended geotechnical parameters. There is an adequate buffer zone around the pits for inclusion of surface haul roads, slope stability structures, rehabilitation, and future pit expansion. The buffer zone surrounding the pit limits was determined using an “upside economic scenario” derived from a US$2,000/oz Au pit shell. The Pavón Norte and Central pit limit does not significantly increase assuming a gold price of US$2,000/oz Au, as the size of the pit is limited by the modelled recovery and waste stripping requirements.

For the Norte pit, a bench geometry of 4.5 m wide and 5 m high was selected based on equipment sizing. Double benching was assumed (i.e. an overall bench height of 10 m in 2 x 5 m benches). For the Central Pit, a bench geometry of 5 m wide and 6 m high was selected. Double-benching was considered (i.e. an overall bench height of 12 m in 2 x 6 m benches).

The pushback sequence in Pavón Norte is dictated by two pushbacks that will allow mining with all the operational conditions for a maximum of 27 months. The average mining rate during this period is 10,000 tpd total material. The average mining rate is calculated based on the total production of pushback 1 and pushback 2 from January 1 to December 31, divided by 365 days.

The life of mine production schedule includes reduced production during the Nicaragua rainy season from late May/early June to November with a reduced throughput of 750 tpd ore during this period. The remaining dry months have a throughout of 1,200 tpd ore


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 2
Pebble crusher 1
SAG mill 20' x 9' 1680 kW 1
Ball mill 13' x 20' 1680 kW 2

Summary:

Single-stage crushing with two jaw crushers capable of processing approximately 400 tonnes per hour (tph) and 200 tph, one utilized for ROM material and the other for spent heap material, followed by a crushed material stockpile.

Two-stage grinding to 70% passing (P70) 75 µm utilizing a conventional SABC (semi-autogenous grinding (SAG) followed by ball milling and pebble crushing) circuit. The grinding circuit consists of one SAG mill followed by two ball mills operating in parallel and an integrated pebble crushing circuit; the SAG and ball mills are 20 ft x 9 ft and 13 ft x 20 ft, respectively, each with a 1,680 kW motor.


Processing

  • Smelting
  • Carbon re-activation kiln
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

Ore from the Pavón deposit will be blended with other feed sources at the La Libertad processing plant.

The La Libertad processing plant can treat approximately 2.25 Mtpa, and current gold recoveries are approximately 94% to 95% for a blend of spent and run of mine (ROM) mill feed from the adjacent La Libertad mines.

The processing plant consists of the following unit operations:

• Single-stage crushing with two jaw crushers, followed by a crushed material stockpile.

• Two-stage grinding to 70% passing (P70) 75 µm utilizing a conventional SABC (semi-autogenous grinding (SAG) followed by ball milling and pebble crushing) circuit.

• Pre-leach thickening to 45% solids, followed by leaching in 11 leach tanks (4 x 1,500 m3and 7 x 570 m3) with oxygen addition for a total of 32 hours residence time. Carbon adsorption is carried out in six 550 m3 Carbon in Pulp (CIP) tanks.

• Tailings disposal by pumping to the lined La Esper ........

Recoveries & Grades:

CommodityParameterAvg. LOM
Gold Recovery Rate, % 94
Gold Head Grade, g/t 4.86

Projected Production:

CommodityUnitsAvg. AnnualLOM
Gold oz 47,000188,213
All production numbers are expressed as metal in doré.

Operational Metrics:

Metrics
Stripping / waste ratio  ......  Subscription required
Waste tonnes, LOM  ......  Subscription required
Ore tonnes mined, LOM  ......  Subscription required
Tonnes milled, LOM  ......  Subscription required
Annual ore mining rate  ......  Subscription required
* According to 2020 study.
Subscription required - Subscription is required.

Reserves at December 31, 2020:
Mineral reserves are reported at a cut-off grade of 1.26 g/t Au
Open Pit Mineral Resources are reported at cut-off grades of 1.17 g/t Au.

CategoryTonnage CommodityGradeContained Metal
Probable 1,281 kt Gold 4.86 g/t 200 koz
Probable 1,281 kt Silver 7.02 g/t 290 koz
Indicated 1,392 kt Gold 5.16 g/t 231 koz
Indicated 1,392 kt Silver 7.72 g/t 346 koz
Inferred 577 kt Gold 3.39 g/t 63 koz
Inferred 577 kt Silver 4.9 g/t 91 koz

Commodity Production Costs:

CommodityUnitsAverage
Total cash costs (sold) Gold USD  ......  Subscription required *†
All-in sustaining costs (sold) Gold USD  ......  Subscription required *†
Assumed price Gold USD  ......  Subscription required *
* According to 2020 study / presentation.
† Net of By-Product.
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Operating Costs:

Units2020
OP mining costs ($/t mined) USD 2.36 *
Processing costs ($/t milled) USD  ......  Subscription required
G&A ($/t milled) USD  ......  Subscription required
* According to 2020 study.
Subscription required - Subscription is required.

2020 Study Costs and Valuation Metrics :

MetricsUnitsLOM Total
Sustaining CapEx $M USD  ......  Subscription required
Total CapEx $M USD  ......  Subscription required
After-tax NPV @ 5% $M USD  ......  Subscription required
After-tax NPV @ 10% $M USD  ......  Subscription required
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Dec 31, 2020
....................... Subscription required ....................... Subscription required Subscription required Aug 28, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
Subscription required - Subscription is required.

News:

NewsDate
Calibre Mining Receives Environmental Permit for Development and Operation of the High-Grade Pavon Central Open-Pit Mine Expected to Drive Production Increase in 2023 June 16, 2022

Aerial view:

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