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Chile
Minera Florida Mine

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 Location:
30 km NW from Rancagua, Chile

  Regional Office:
Camino El Asiento s/n, Alhué
Melipilla
Chile
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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
  • Zinc
Mining Method
  • Cut & Fill
  • Open stoping
Processing
  • Flotation
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life6 years (as of Jan 1, 2020)
Latest NewsYamana Gold Provides Exploration Update: Reports Exploration Success in New Areas at Minera Florida With the Potential to Significantly Expand Mineral Resource Base and Increase Mine Life...     September 8, 2020


Owners

Source: p. 85
CompanyInterestOwnership
Yamana Gold Inc. 100 % Indirect

Deposit Type

  • Vein / narrow vein


Summary:

The area of the Minera Florida Mine is underlain by upper cretaceous volcanic and intrusive rocks. The volcanic rocks comprise porphyritic andesite, brecciated andesite, lithic and crystal tuff, and brecciated tuff. The bulk of these rocks are also affected by a sequence of hydrothermal alteration. The intrusive rocks comprise mainly granodiorites and monzodiorites.

Gold mineralization in the Minera Florida Mine area occurs as native gold and electrum associated with sulphide minerals, such as pyrite, chalcopyrite, sphalerite and galena, as well as magnetite. Mineralization is commonly associated with hydrothermal alteration including quartz, adularia, epidote, chlorite, and actinolite. Quartz occurs in four types; as grey siliceous zones, green quartz, translucent quartz, and white quartz. Some veins exhibit metal zoning, with a zinc-rich silver-rich zone in the upper part of the vein, a goldrich zone in the central part, and a zinc-rich zone in the lower part of the vein.

In general, mineralized structures include an inner quartz vein (core) consisting of material exhibiting quartz flooding or massive quartz, surrounded by stockwork of quartz veinlets and/or hydrothermal breccia, both of which are mineralized. Gold mineralization in the Minera Florida Mine area has been identified in four types of rocks, in places adjacent to each other, as follows: (1) silicified crystal tuff; (2) lithic to crystal tuff; (3) brecciated tuff; and (4) porphyritic andesite.

There are at least nineteen mineralized veins discovered and partially developed in the Minera Florida Mine area. These veins range from 0.8 metres to 30 metres in thickness, and the average grade ranges from 1.5 grams per tonne of gold to 12 grams per tonne of gold, 6 grams per tonne of silver to 100 grams per tonne of silver, and 0.1% Zn to 1.81% Zn. Many of the mineralized veins at the Minera Florida Mine area do not have a surface expression, but are associated with structures identified by underground diamond drilling.


Mining Methods

  • Cut & Fill
  • Open stoping


Summary:

The underground workings are developed by adits driven from surface. An internal ramp system provides access to the stopes. Sublevel are driven in the veins and mining sequence advances from the top down, with pillars left at regular intervals. Underground mining operations are mechanized, utilizing: articulated haul trucks; electronic hydraulic development and production jumbos; load- haul dumpers; and a number of ground support and service equipment. Ore is hauled using 25-tonne trucks from the mine to a transfer point and 40-tonne trucks haul the ore from the transfer point to the process plant. Waste is transported by 25-tonne trucks.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 112 kW 1
Cone crusher 224 kW 2
Ball mill 3.7m x 4.3m 2

Summary:

The crushing plant is operated on a two 12-hour shifts per day, seven day per week schedule. The trucks deliver the ore (<635 mm) to a dump hopper. The undersize is crushed to -100 mm by a 112 kW primary jaw crusher and then placed either in one of three 80-tonne storage bins or alternatively on a stockpile. The ore is then further crushed by a 224 kW HP300 standard secondary cone crusher and a 224 kW HP300 short head tertiary crusher. The final crushed product is 100% passing 10 mm and is delivered to one of two 600-tonne storage silos ahead of the grinding circuit. Additional storage is provided by stockpiling adjacent to the silos.

The crushed ore is fed to one of two 3.7 m x 4.3 m Dominion Engineering ball mills where it is ground to a 65% passing 75 µm in closed circuit with a cyclone cluster.


Processing

  • Flotation
  • Concentrate leach
  • Agitated tank (VAT) leaching
  • Carbon in pulp (CIP)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The crushed ore is fed to two 3.7 m x 4.3 m ball mills where it is ground to a 65% passing 75 µm in closed circuit with a cyclone cluster. The cyclone overflow is then delivered to the flotation circuit that consists of eight 20 m3 flotation cells arranged in a rougher, scavenger, cleaner, and recleaner configuration. The bulk sulphide concentrate produced contains 22% Zn, approximately 105 g/t Au, and some silver (silver content varies with the head grade). The flotation plant recovers approximately 87% of the gold, 83% of the silver, and 80% of the zinc. The flotation plant tailings are pumped to the tailings facility.

The flotation bulk concentrate is thickened to 50% solids and leached with NaCN (sodium cyanide) solution in a series of ten 50 m3 leach tanks providing 72 hours of residence time. The products of the leaching circuit are a pregnant solution containing approximately 30 g/m3 Au and a thickened pulp containing the zinc sulphides. The leaching circuit recovers ........

Recoveries & Grades:

CommodityParameter201920182017201620152014
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required88.682.481.180.8
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required3.052.342.322.23
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required59.55458.758.7
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required23.614.51929.9

Production:

CommodityUnits201920182017201620152014
Gold oz  ......  Subscription required81,63590,366104,312112,580100,076
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Ore tonnes mined  ......  Subscription required  ......  Subscription required801,250 t862,132 t858,666 t841,485 t
Tonnes processed  ......  Subscription required  ......  Subscription required1,033,295 t1,662,161 t1,857,010 t1,729,861 t
Subscription required - Subscription is required.

Reserves at December 31, 2018:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven In-Situ (UG) 690 kt Gold 3.61 g/t 80 koz
Proven In-Situ (UG) 690 kt Silver 28.1 g/t 623 koz
Proven In-Situ (UG) 690 kt Zinc 1.53 % 23 M lbs
Probable In-Situ (UG) 2,512 kt Gold 3.54 g/t 286 koz
Probable Tailings 1,248 kt Gold 0.94 g/t 38 koz
Probable Total 3,760 kt Gold 2.68 g/t 324 koz
Probable In-Situ (UG) 2,512 kt Silver 21.9 g/t 1,770 koz
Probable Tailings 1,248 kt Silver 14.6 g/t 584 koz
Probable Total 3,760 kt Silver 19.5 g/t 2,353 koz
Probable In-Situ (UG) 2,512 kt Zinc 1.13 % 62 M lbs
Probable Tailings 1,248 kt Zinc 0.58 % 16 M lbs
Probable Total 3,760 kt Zinc 0.94 % 78 M lbs
Proven & Probable In-Situ (UG) 3,202 kt Gold 3.56 g/t 366 koz
Proven & Probable Tailings 1,248 kt Gold 0.94 g/t 38 koz
Proven & Probable Total 4,449 kt Gold 2.82 g/t 404 koz
Proven & Probable In-Situ (UG) 3,202 kt Silver 23.2 g/t 2,393 koz
Proven & Probable Tailings 1,248 kt Silver 14.6 g/t 584 koz
Proven & Probable Total 4,449 kt Silver 20.8 g/t 2,976 koz
Proven & Probable In-Situ (UG) 3,202 kt Zinc 1.21 % 85 M lbs
Proven & Probable Tailings 1,248 kt Zinc 0.58 % 16 M lbs
Proven & Probable Total 4,449 kt Zinc 1.04 % 102 M lbs
Measured Total 1,207 kt Gold 5.87 g/t 228 koz
Measured Total 1,207 kt Silver 41 g/t 1,592 koz
Measured Total 1,207 kt Zinc 2.22 % 62 M lbs
Indicated Total 3,829 kt Gold 4.79 g/t 590 koz
Indicated Total 3,829 kt Silver 29.2 g/t 3,594 koz
Indicated Total 3,829 kt Zinc 1.63 % 138 M lbs
Measured & Indicated Total 5,036 kt Gold 5.05 g/t 817 koz
Measured & Indicated Total 5,036 kt Silver 32 g/t 5,186 koz
Measured & Indicated Total 5,036 kt Zinc 1.77 % 197 M lbs
Inferred Total 6,445 kt Gold 5.01 g/t 1,038 koz
Inferred Total 6,445 kt Silver 29.4 g/t 6,093 koz
Inferred Total 6,445 kt Zinc 1.32 % 187 M lbs

Commodity Production Costs:

CommodityUnits201920182017201620152014
Cash costs (sold) Gold Equivalent USD  ......  Subscription required 917 / oz
Cash costs Gold USD 916 / oz 812 / oz 735 / oz 717 / oz 678 / oz
Cash costs Silver USD 11 / oz 9.9 / oz 9.46 / oz 6.08 / oz
All-in sustaining costs (sold) Gold Equivalent USD  ......  Subscription required 1,327 / oz
All-in sustaining costs (AISC) Gold USD 1,099 / oz 1,090 / oz 955 / oz 883 / oz
All-in sustaining costs (AISC) Silver USD 14.9 / oz 12.7 / oz 11.8 / oz
Subscription required - Subscription is required.

Financials:

Units201920182017201620152014
Sustaining costs M USD  ......  Subscription required14.5  24.6   23.2   19.2  
Capital expenditures M USD  ......  Subscription required60.7  52.6   45.3   39.4   58.2  
Revenue M USD  ......  Subscription required102.6  123.1   135.5   138.5  
Operating Income M USD  ......  Subscription required-162.3  3.1   22.6   -283.5  
Subscription required - Subscription is required


Heavy Mobile Equipment as of June 1, 2017:
HME TypeQuantity
Jumbo 16
Load-Haul-Dump (LHD) 8
Truck (haul) 14

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2021
....................... Subscription required ....................... Subscription required Subscription required Mar 15, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2021
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Annual Report 2018
Corporate Presentation 2018
Corporate Presentation 2018
Press Release 2018
Corporate Presentation 2017
Financial Review 2017
Management Discussion & Analysis 2017
Annual Report 2016
Annual Report 2015
Technical Report 2010
Subscription required - Subscription is required.

News:

NewsDate
Yamana Gold Provides Exploration Update: Reports Exploration Success in New Areas at Minera Florida With the Potential to Significantly Expand Mineral Resource Base and Increase Mine Life... September 8, 2020

Aerial view:

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