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Peru
Caylloma Mine

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 Location:
66 km SE from Espinar, Peru

  Address:
Av. Jorge Chavez 154, piso 5, Miraflores
Lima
Peru
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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
  • Silver
  • Gold
  • Lead
  • Zinc
Mining Method
  • Cut & Fill
  • Mechanized Cut & Fill
  • Hydraulic backfill
Processing
  • Flotation
Mine Life3 years (as of Jan 1, 2021)
Latest NewsFortuna reports updated Mineral Reserves and Mineral Resources     March 17, 2022


Owners

Source: p. 14,15,52
CompanyInterestOwnership
Fortuna Silver Mines Inc. 100 % Indirect
Since June 2005, the Caylloma Property has been 100 percent owned by Minera Bateas S.A.C., a Peruvian subsidiary of Fortuna Silver Mines Inc.

Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

The Caylloma polymetallic and silver-gold rich veins are characteristic of a typical low sulfidation epithermal deposit according to the classification of Corbett (2002) having formed in a relatively low temperature, shallow crustal environment. The epithermal veins in the Caylloma District are characterized by minerals such as pyrite, sphalerite, galena, chalcopyrite, marcasite, native gold, stibnite, argentopyrite, and various silver sulfosalts (tetrahedrite, polybasite, pyrargyrite, stephanite, stromeyerite, jalpite, miargyrite and bournonite). These are accompanied by gangue minerals such as quartz, rhodonite, rhodochrosite, johannsenite (Mn-pyroxene) and calcite.

Veins in the Caylloma District show structural patterns and controls typical of other vein systems hosted by Tertiary volcanic rocks in the western Peruvian Andean range. The Caylloma District vein system was developed as a set of dilatational structures as a consequence of tension generated during the main compressional event of the Andes. Veins are persistent along strike and dip. Locally, veins are displaced by post-mineral faulting along a north-northwest bearing. Horizontal displacement along these faults is minor and ranges from centimeters up to a few meters. No significant vertical displacement is observed on the structures. The vein system is not affected by any folding.

Three types of hydrothermal alteration have been identified at the Caylloma Mine: (1) quartz- adularia; (2) quartz-illite; and (3) propylitic. The quartz-adularia (+pyrite +/-illite) alteration is restricted to the margins of the veins, with the thickness of the altered zone being generally proportional to the thickness of the vein. The width varies from a few centimeters to a few meters. Quartz replaces the volcanic matrix in the rocks, and quartz plus adularia occur as small veinlets or colloform bands. Pyrite is disseminated in the veinlets and in iron-manganese minerals in the wall rock. Illite is a product of alteration of the plagioclase and matrix of the volcanic host rocks. Quartz-adularia is absent in the upper parts of the vein systems. The alteration assemblage in the upper portions of the vein systems consists of a narrow selvage of quartz-illite near the vein. Quartz-illite grades into quartz-adularia at depth. Propylitic alteration is widespread throughout the property and may be regional in nature and unrelated to mineralizing events. The propylitic alteration is a fine aggregate of chlorite, epidote, calcite and pyrite.

There are two distinct types of mineralization at the Caylloma Mine, one with predominately elevated silver values (San Cristobal, La Plata, Bateas, San Carlos, Apostoles, San Pedro, and El Toro veins), and the other being polymetallic with elevated silver, lead, zinc, copper, and gold values (Animas, Nancy and Santa Catalina veins).

A supergene oxide horizon has been identified which contains the following secondary minerals: psilomelane, pyrolusite, goethite, hematite, chalcocite, covelite and realgar (Corona and Antimonio veins). The oxide zone is thin, with no evidence of secondary silver enrichment.

Veins are tabular in nature, with open spaces filled by episodic deposition of metallic sulfides and gangue minerals. According to Echavarria et al., (2006) most of the minerals, both silver and base metals, are related to the deposition of manganese mineralization occurring in bands, comprised of quartz, rhodonite, rhodochrosite and sulfides.

Vein systems at the Caylloma Mine have a general northeast-southwest bearing and predominant southeast dip. Host rocks are pyroclastic breccias, effusive andesitic lavas and volcaniclastics of the Tacaza volcanic group.

There are two different types of mineralization at Caylloma; the first is comprised of silver- rich veins with low concentrations of base metals. The second type of vein is polymetallic in nature with elevated silver, lead, zinc, copper, and gold grades.

Mineralization in these vein systems occurs in steeply dipping ore shoots ranging up to several hundred meters long with vertical extents of over 400 m. Veins range in thickness from a few centimeters to 20 m, averaging approximately 1.5 m for silver veins and 2.5 m for polymetallic veins.

Silver veins
The silver vein systems outcrop in the central and northern portions of the Caylloma District, with the best exposures of mineralization between the Santiago River, Chuchilladas and Trinidad streams. The mineralization is composed primarily of colloform banded rhodochrosite, rhodonite, and milky quartz, with silver sulfosalts present in certain veins. Vein systems extend to the eastern flank of the Huarajo Stream. Exposures in this area consist of quartz-calcite with low concentrations of manganese oxides. Silver veins can be sub-divided into two groups, 1) those that have sufficient geological information to support Mineral Resource estimates and 2) those that have been identified as exploration targets.

1) Bateas/Bateas Piso/Bateas Techo, La Plata/Cimoide La Plata, San Cristobal, San Pedro, San Carlos, Paralela/Ramal Paralela, Carolina, and Don Luis II.
2) Eureka, El Toro, San Pedro Oeste, Apostoles, Santa Rosa, La Peruana, Vilafro Sur, Cerro Vilafro, Cailloma 6, Condorcoto, Llocococha, Pampuyo-Pumanuta, Giro, Antacollo.

Polymetallic veins
A series of polymetallic veins has been identified in the southern and central portions of the Caylloma Mine. These vein systems tend to be greater in strike length and thickness when compared to the silver vein systems. The main metallic minerals associated with the polymetallic veins are galena, sphalerite, pyrite, chalcopyrite, and in some zones pyrargyrite. The polymetallic veins can also be sub-divided into two groups, 1) those that have sufficient geological information to support Mineral Resource estimates and 2) those that have been identified as exploration targets.

1) Animas, Animas NE, Cimoide ASNE, Ramal Techo ASNE, Santa Catalina, Soledad, Silvia, Pilar, Patricia, Nancy, and Rosita veins.
2) El Diablo and Antimonio veins.


Mining Methods

  • Cut & Fill
  • Mechanized Cut & Fill
  • Hydraulic backfill


Summary:

The mining method applied in the exploitation of the main vein (Animas) is overhand cut-and-fill using either mechanized, semi-mechanized or conventional extraction methods. All mining is undertaken by contractors in a southwest to northeast direction following the strike of the vein. Production capacity at the mine is 1,500 tpd. The following describes the cut-and-fill mechanized, semi-mechanized, and conventional extraction methods.

Mechanized cut-and-fill
Mechanized mining uses a jumbo drill rig and scoop tram for loading. The ore haulage is performed by trucks. Rock support is applied through rock bolts and shotcrete. The average mining width ranges between 3.5 m and 17 m. Mechanized mining is regarded as only being suitable for the Animas, Animas NE and their associated splays, as well as the Nancy vein based on the geological structure and geotechnical studies. Mechanized cut-and-fill comprises 93 % of mining planned in the LOM.

The mechanized mining sequence includes: drilling (with a jumbo drill rig), blasting, support, loading (with a scoop tram) and haulage.

Semi-mechanized cut-and-fill
Semi-mechanized mining is performed using handheld drilling equipment (jacklegs) and scoops for loading. Ore haulage is performed by truck. Rock support is supplied using rock bolts installed using manual drilling and installation techniques. Semi-mechanized mining is applied to narrow veins with average widths between 0.8 m and 2.0 m.

The semi-mechanized mining sequence involves: drilling (with jacklegs), blasting, support, loading and haulage. Depending on vein width, once the ore has been extracted the walls have to be drilled and blasted in order to allow the minimum working width, especially for the loading equipment.

Conventional cut-and-fill
Conventional mining is performed using handheld drilling equipment (jacklegs) and scrapers for loading. The ore haulage is done with trucks and the support is applied with rock bolts in manual form. This system is applied in narrow veins with average widths between 0.5 m and 0.8 m. This mining method is only applicable to the Bateas, La Plata, Cimoide La Plata and San Cristobal veins that are scheduled for mining in the final years of the LOM.

The mining production period extends from 2019 to 2023, almost five years. At full production the planned mining rate is 1,500 tpd (535,500 tonnes per annum). Planned LOM production is 2.63 Mt at an average silver grade of 77 g/t, gold grade of 0.18 g/t, lead grade of 2.11 %, and zinc grade of 3.69 %.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher ....................... Subscription required 24" x 36" 1
Jaw crusher 1
Cone crusher ....................... Subscription required 1
Cone crusher ....................... Subscription required 1
Ball mill ....................... Subscription required 1.8m x 1.8m 1
Ball mill ....................... Subscription required 2.4m x 0.9m 1
Ball mill ....................... Subscription required 2.4m x 3m 1
Ball mill ....................... Subscription required 2.1m x 2.1m 1
Ball mill 1.8m x 2.4m 1

Summary:

Crushing and milling circuits
The crushing process is fed from the 10,000 t capacity stock pile used for ore storage and blending. The process commences with feed to the coarse hopper, which has a 450 t active capacity with 30 cm separation grates. The mineral is extracted from the coarse hopper through the apron feeder that feeds the vibrating grizzly with variable separation that, in turn, feeds the Kurimoto jaw crusher, resulting in a product size varying between 76 mm and 90 mm. The mineral is transported on two conveyor belts to the two-deck vibrating 6 by 14-foot (1.82 x 4.27 m) screen. The screen’s undersize is fed to the stockpile via conveyer belts with the oversize going to a Sandvik CH-420 secondary crusher, the product of which goes to the two-deck vibrating 5 by 14 foot (1.52 x 4.27 m) screen, the undersize of this screen feeds the stockpile. The oversize is fed through a conveyor belt to the Sandvik CH-430 tertiary crusher, the discharge of which returns to the initial conveyer belt, closing the circuit.

Additionally, there is a standby primary crushing circuit that starts at a 100 t capacity coarse hopper. From the hopper, the mineral is fed to a Kueken 24 by 36-inch (0.6 x 0.9 m) jaw crusher through a Ross chain feeder. The discharge from this crusher is transported via conveyors 19 and 20 to conveyor 2-A. There are three permanent magnets and one electromagnet on the conveyors to prevent the entry of tramp iron.

The grinding circuit has two stages. The primary stage operates in an open circuit, consisting of two ball mills (Comesa 2.4 m by 3.0 m and a Denver 2.1 m by 2.1 m). The secondary stage operates in closed circuit and consists of three ball mills, a Magensa 1.8 m by 1.8 m, a Hardinge 2.4 m by 0.9 m and a Liberty 1.8 m by 2.4 m. The final product of the grinding circuit is 60 % passing 75 µm.

The Comesa and Denver primary grinding mills are fed independently by conveyor belts. The Comesa primary mill operates with the Magensa and Libertad secondary mills. The Comesa mill discharge feeds a flash cell (SK 240) with concentrate from the flash cell being sent to the lead thickener. Tailings are fed to a 6 by 6-inch (15 x 15 cm) horizontal pump which in turn feeds the Derrick Stack Sizer. The undersize goes to the flotation circuit and the oversize feeds the three secondary ball mills.

The Denver primary ball mill operates with the Hardinge secondary ball mill. Discharge from this mill feeds a 6 by 4-inch (15 x 10 cm) horizontal pump, which in turn feeds the D-15 cyclone. The cyclone’s overflow goes to the flotation circuit and the underflow returns to the three secondary ball mills.


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

The Bateas processing plant is a typical flotation operation and consists of five stages: crushing; milling; flotation; thickening and filtering and tailings disposal. Each of the main stages is comprised of multiple sub-stages. A summary of each stage is as follows:

- Crushing: includes three stages, primary, secondary, and tertiary;

- Milling: includes two stages, primary and secondary;

- Flotation: consists of two operating flotation circuits (lead–silver, and zinc) and one copper flotation circuit on standby;

- Thickening and filtering are performed separately for the concentrates, which after filtering undergo a drying process before being placed in their respective storage bins to await transportation;

- Tailings disposal: Final tailings are classified through cyclones. The coarse fraction (underflow) is placed onto a concrete pad and transported to the mine to be used as hydraulic fill. The finer fraction (overflow) is pumpe ........

Recoveries & Grades:

CommodityParameter2021202020192018201720162015
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required84.184.38483
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required636690136
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required21.915.91630
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required  ......  Subscription required0.180.180.20.26
Lead Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required91.3919494
Lead Head Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required2.622.813.062.47
Zinc Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required90.2909091
Zinc Head Grade, %  ......  Subscription required  ......  Subscription required  ......  Subscription required4.284.214.253.84

Production:

CommodityProductUnits2022202120202019201820172016
Silver Metal in concentrate koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required9119431,256
Gold Metal in concentrate koz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Metal in concentrate M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Zinc Metal in concentrate M lbs  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Equivalent Payable metal oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Lead Concentrate kt
Zinc Concentrate kt
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics202220212020201920182017
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required531,307 t534,773 t529,704 t
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required1,488 t1,502 t1,484 t
Daily mining capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required1,430 t of ore1,430 t of ore
Daily milling capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required1,500 t1,500 t1,500 t
^ Guidance / Forecast.
Subscription required - Subscription is required.

Reserves at December 31, 2021:
Mineral Reserves for the Caylloma Mine are reported above NSR breakeven cut-off values based on underground mining methods including; mechanized (breasting) at US$82.79/t; mechanized (uppers) at US$77.33/t; semi-mechanized at US$90.19/t; and a conventional method at US$155.1/t; using assumed metal prices of US$21/oz Ag, US$1,600/oz Au, US$2,000/t Pb and US$2,500/t Zn.

Mineral Resources are reported at an NSR cut-off grade of US$65/t for veins classified as wide (Animas, Animas NE, Nancy, San Cristobal veins) and US$135/t for veins classified as narrow (all other veins) based on the same parameters used for Mineral Reserves.

CategoryTonnage CommodityGradeContained Metal
Proven 234 kt Silver 101 g/t 0.8 M oz
Proven 234 kt Gold 0.3 g/t 2 koz
Proven 234 kt Lead 2.38 %
Proven 234 kt Zinc 2.96 %
Probable 2,933 kt Silver 83 g/t 7.8 M oz
Probable 2,933 kt Gold 0.19 g/t 18 koz
Probable 2,933 kt Lead 2.55 %
Probable 2,933 kt Zinc 3.76 %
Proven & Probable 3,167 kt Silver 84 g/t 8.6 M oz
Proven & Probable 3,167 kt Gold 0.2 g/t 20 koz
Proven & Probable 3,167 kt Lead 2.53 %
Proven & Probable 3,167 kt Zinc 3.7 %
Measured 724 kt Silver 97 g/t 2.3 M oz
Measured 724 kt Gold 0.34 g/t 8 koz
Measured 724 kt Lead 1.79 %
Measured 724 kt Zinc 3.24 %
Indicated 1,994 kt Silver 82 g/t 5.3 M oz
Indicated 1,994 kt Gold 0.24 g/t 15 koz
Indicated 1,994 kt Lead 1.61 %
Indicated 1,994 kt Zinc 3.09 %
Measured & Indicated 2,718 kt Silver 86 g/t 7.5 M oz
Measured & Indicated 2,718 kt Gold 0.26 g/t 23 koz
Measured & Indicated 2,718 kt Lead 1.65 %
Measured & Indicated 2,718 kt Zinc 3.13 %
Inferred 3,809 kt Silver 116 g/t 14.2 M oz
Inferred 3,809 kt Gold 0.59 g/t 73 koz
Inferred 3,809 kt Lead 2.03 %
Inferred 3,809 kt Zinc 3.5 %

Commodity Production Costs:

CommodityUnits2021202020192018201720162015
Total cash costs (sold) Silver Equivalent USD  ......  Subscription required
Total cash costs Silver Equivalent USD  ......  Subscription required  ......  Subscription required 7.64 / oz 7.73 / oz
Total cash costs Silver USD -35.38 / oz† -34.56 / oz† -6.78 / oz† 6.6 / oz†
All-in sustaining costs (sold) Silver Equivalent USD  ......  Subscription required
All-in sustaining costs (AISC) Silver Equivalent USD  ......  Subscription required  ......  Subscription required 11.7 / oz 11.2 / oz
All-in sustaining costs (AISC) Silver USD -13.04 / oz† 4.34 / oz† 13.6 / oz†
All-in costs Silver Equivalent USD  ......  Subscription required  ......  Subscription required  ......  Subscription required 11.7 / oz 11.2 / oz
All-in costs Silver USD -13.04 / oz† 6.74 / oz† 15 / oz†
^ Guidance / Forecast.
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units20212020201920182017201620152014
UG mining costs ($/t milled) USD 34.73841.341.440.435.3
Processing costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Total operating costs ($/t milled) USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Financials:

Units2022202120202019201820172016
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required14.7   9.6   7.6  
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required16.4   11.7   11.7  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required89.1   88.1   67.1  
Operating Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required22.9   62.4   16.5  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required29.2   57.8   17.2  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required18.5   40.6   12.8  
EBITDA M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required37   39   25.2  
Subscription required - Subscription is required


Proposed Heavy Mobile Equipment as of March 8, 2019:
HME TypeModelSizeQuantity
Bolter ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
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Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 27, 2022
....................... Subscription required ....................... Subscription required Subscription required Mar 27, 2022
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Press Release 2022
................................... Subscription required 2021
................................... 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
................................... Subscription required 2019
................................... Subscription required 2019
Management Discussion & Analysis 2018
Press Release 2018
Press Release 2018
Corporate Presentation 2017
Financial Review 2017
Management Discussion & Analysis 2017
Technical Report 2017
Form 40-F 2016
Management Discussion & Analysis 2016
Management Discussion & Analysis 2014
Subscription required - Subscription is required.

News:

NewsDate
Fortuna reports updated Mineral Reserves and Mineral Resources March 17, 2022
Fortuna Updates Mineral Reserves and Mineral Resources March 26, 2021
Fortuna announces resumption of production at the Caylloma Mine, Peru July 28, 2020
Fortuna reports death of contractor employee at the Caylloma Mine, Peru July 6, 2020
Fortuna provides an update on its operations at the Caylloma Mine in Peru April 27, 2020
Fortuna Updates Mineral Reserves and Mineral Resources March 26, 2020

Aerial view:

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