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Mexico
Bolanitos Mine

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 Location:
10 km NE from Guanajuato, Guanajuato, Mexico

  Regional Office:
Calle Cerro Gordo del Campestre No. 201, interior #208 Colonia Las Quintas
Leon Guanajuato
Guanajuato, Mexico
37125
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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
Mining Method
  • Cut & Fill
  • Longhole stoping
Processing
  • Flotation
Latest NewsEndeavour Silver Updates 2020 Mineral Reserve and Resource Estimates     February 3, 2021


Owners

 
CompanyInterestOwnership
Endeavour Silver Corp. 100 % Indirect
Minera Bolañitos SA. de CV. 100 % Direct

Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

Mineralized veins at Bolañitos consist of the classic banded and brecciated epithermal variety. Silver occurs primarily in dark sulfide-rich bands within the veins, with little mineralization within the wall rocks. The major metallic minerals reported include pyrite, argentite, electrum and ruby silver, as well as some galena and sphalerite, generally deeper in the veins. Mineralization is generally associated with phyllic (sericite) and silicification alteration which forms haloes around the mineralizing structures. The vein textures are attributed to the brittle fracturing-healing cycle of the fault-hosted veins during and/or after faulting.

Economic concentrations of precious metals are present in “shoots” distributed vertically and laterally between non-mineralized segments of the veins. Overall, the style of mineralization is pinch-and-swell with some flexures resulting in closures and others generating wide sigmoidal breccia zones.

Primary economic mineralization at Bolañitos is gold and silver. Bolañitos is postulated to be a low sulphidation system with pyrite but no arsenopyrite.

The silver-rich veins of Bolañitos contain quartz, adularia, pyrite, acanthite, naumannite and native gold. Native silver is widespread in small amounts. Much of the native silver is assumed to be supergene. Silver sulfosalts (pyrargyrite and polybasite) are commonly found at depth.


Mining Methods

  • Cut & Fill
  • Longhole stoping


Summary:

Conventional drill and blast methods are used to extract the ore at Bolañitos, and access to the mining areas is provided by ramps and audits. Mine development headings are drilled by jumbo and by jackleg. Traditionally a conventional bottom-up cut and fill mining method was employed with waste rock brought in using diesel or electric loaders. The rock used to backfill the stopes is either dropped down a bore hole from surface or is generated from the waste development underground. Over the past several years a transition to a modified long hole method has taken place wherever the width and dip of the vein is applicable to this method.

Once sill development is completed and the limits of the ore have been defined, stope production can begin. For conventional cut and fill stoping, ore is mined upward in horizontal slices using jackleg drills. Cut and fill mining is a method of short hole mining with hole lengths usually less than 2m. For long hole mining the holes are typically 10-12m in length but vary from 6 to 16m depending on the stope. Under certain circumstances concrete is used as fill to create a solid floor. This enables mining from the stope below up to the concrete pillar and recovering most, if not all of the ore pillar that would otherwise be left behind. This process is usually reserved for high- grade floor pillars.

For cut and fill the production cycle starts by drilling upper holes using a jackleg. Geologists mark up the vein, and the stope is drilled and blasted accordingly. Drillholes on the vein are blasted first. After the ore has been mucked, the holes drilled in waste are then blasted to achieve the dimensions required for the scoop to work in the next production lift.

By comparison, longhole open-stoping, holes are drilled upwards and/or downwards from the sill level. Longhole methods are typically 6 to 16m in length and are more productive than cut and fill methods. Longhole stoping is also cheaper than conventional cut and fill stoping. As with cut and fill methods, longhole stopes are filled with waste rock from development headings or from surface waste.

Some of the ore produced with the longhole drill machines is generated by drilling old pillars. Other stopes are blind by drilling uppers and blasting a slot at the far end of the stope to enable the ore to break in the subsequent larger stope blasts. Uppers are drilled to a 10-15m height on vein projections in rows across the width of the vein. The rows closest to the slot are blasted first. The stope is mucked clean, or at least sufficiently to allow the next blast. The ore is extracted using remote-controlled scoops.


Crushing and Grinding


Processing

  • Flotation

Flow Sheet: Subscription required

Summary:

The plant processing rate is 1,600 t/d after it was expanded from 1,200 t/d in 2012 adding a 6’x16’ vibration screen, four additional flotation cells 500 ft3 each, six 1st cleaner cells 100 ft3 each, six 2nd cleaner cells 50 ft3 each, conveyor belts and a flocculent mixing system.

Run-of-mine ore is hauled by 20 tonne dumper trucks and discharge on a grizzly with opening 11”. Oversize rock (>11’) is broken by a backhoe hydraulic hammer. The undersize material falls in a feed bin and further crushed in a primary jaw crusher of size 24”x36”. After the primary crusher the ore is held in two coarse ore bins each with a 450 t capacity.

From the coarse ore bins the ore is conveyed to a 6’x16’ vibratory screen with openings 3/8”, the undersize product is conveyed to the fine ore bins. The oversize material is fed to a 4.25’ standard head Symons secondary cone crusher where the ore size is crushed down to 2”. The secondary crusher product is screened by a 5’x10’ ........

Recoveries & Grades:

CommodityParameter20192018201720162015201420132012
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Head Grade, g/t 73868081118148149148
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 1.691.792.242.311.992.362.632.19
Subscription required - Subscription is required.

Production:

CommodityProductUnits202020192018201720162015
Silver Metal in doré oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required934,2381,052,6171,449,773
Gold Metal in doré oz  ......  Subscription required ^  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Payable metal oz  ......  Subscription required  ......  Subscription required896,8691,010,5121,389,920
Gold Payable metal oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
^ Guidance / Forecast.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required507,704 t
Daily ore mining rate  ......  Subscription required  ......  Subscription required  ......  Subscription required1,391 t
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required507,704 t455,226 t567,873 t
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required1,600 t1,600 t
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryTonnage CommodityGradeContained Metal
Proven 39,000 t Silver 68 g/t 86,000 oz
Proven 39,000 t Gold 2.56 g/t 3,300 oz
Proven 39,000 t Silver Equivalent 350,000 oz
Probable 327,000 t Silver 43 g/t 455,000 oz
Probable 327,000 t Gold 2.44 g/t 25,700 oz
Probable 327,000 t Silver Equivalent 2,511,000 oz
Measured 33,000 t Silver 124 g/t 131,000 oz
Measured 33,000 t Gold 1.89 g/t 2,000 oz
Measured 33,000 t Silver Equivalent 291,000 oz
Indicated 502,000 t Silver 160 g/t 2,588,000 oz
Indicated 502,000 t Gold 1.95 g/t 31,400 oz
Indicated 502,000 t Silver Equivalent 5,100,000 oz
Inferred 832,000 t Silver 113 g/t 3,031,000 oz
Inferred 832,000 t Gold 2.31 g/t 61,700 oz
Inferred 832,000 t Silver Equivalent 7,967,000 oz

Commodity Production Costs:

CommodityUnits2019201820172016201520142013
Cash costs Silver USD  ......  Subscription required  ......  Subscription required 10.3 / oz 8.68 / oz 10.3 / oz 10.1 / oz 9.48 / oz
Cash costs Gold USD  ......  Subscription required  ......  Subscription required 767 / oz 646 / oz 746 / oz 686 / oz 564.43 / oz
Cash costs Silver USD  ......  Subscription required†  ......  Subscription required† -4 / oz† -8.37 / oz† 4.31 / oz† 1.94 / oz† -2.87 / oz†
Total cash costs Silver USD  ......  Subscription required†  ......  Subscription required† -1.8 / oz† -4.49 / oz† 11.3 / oz† 14.1 / oz† 1.3 / oz†
All-in sustaining costs (AISC) Silver USD  ......  Subscription required†  ......  Subscription required† 1.62 / oz† -4.77 / oz† 11.8 / oz† 8.7 / oz† 7.39 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Operating Costs:

Units2019201820172016201520142013
Direct operating costs ($/t milled) USD 77.964.267.757.17287.479.5

Financials:

Units20202019201820172016201520142013
Capital expenditures (planned) M USD  ......  Subscription required
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 7.25   9.3   21.4  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 49.2   86.5  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -21.62  
After-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -18.33   13.2  
Subscription required - Subscription is required


Heavy Mobile Equipment as of March 27, 2018:
HME TypeModelSizeQuantity
Jumbo ....................... Subscription required 1
Jumbo ....................... Subscription required 2
Scoop Tram ....................... Subscription required 3.5 cu. yd 1
Scoop Tram ....................... Subscription required 6 cu. yd 1
Scoop Tram ....................... Subscription required 2 cu. yd 3
Scoop Tram ....................... Subscription required 3.5 cu. yd 4
Scoop Tram ....................... Subscription required 2 cu. yd 1
Scoop Tram ....................... Subscription required 3.5 cu. yd 1
Scoop Tram ....................... Subscription required 2 cu. yd 1
Scoop Tram ....................... Subscription required 1.25 cu. yd 1
Scoop Tram ....................... Subscription required 1.5 cu. yd 1
Scoop Tram ....................... Subscription required 2 cu. yd 3
Truck (dump) 7 cu. m 10
Truck (underground) 2 cu. yd 2
Truck (underground) ....................... Subscription required 10 t 4
Truck (underground) ....................... Subscription required 15 t 2
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required May 6, 2020
....................... Subscription required ....................... Subscription required May 6, 2020
....................... Subscription required ....................... Subscription required May 6, 2020
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018
Subscription required Subscription required Subscription required 2017
Subscription required Subscription required Subscription required 2016
Subscription required Subscription required Subscription required 2015

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Annual Report 2017
Corporate Presentation 2017
Financial Review 2017
Management Discussion & Analysis 2017
Press Release 2017
Year-end Mineral Reserves 2017
Financial Review 2016
Management Discussion & Analysis 2016
Form 40-F 2015
Management Discussion & Analysis 2015
Technical Report 2015
Management Discussion & Analysis 2013
Subscription required - Subscription is required.

News:

NewsDate
Endeavour Silver Updates 2020 Mineral Reserve and Resource Estimates February 3, 2021
Endeavour Silver Reports Highest Quarterly Production in Two Years; Produces 1,117,289 oz Silver and 12,586 oz Gold... January 7, 2021
Endeavour Silver Restarts Mining Operations in Mexico May 28, 2020
Endeavour Silver: Mexican Government Declares COVID-19 National Health Emergency, Only Essential Services to Remain Open, Endeavour Silver Suspending its Mexican Mining Operations Until April 30, 2020 April 2, 2020
Endeavour Silver Reports High Grade Silver-Gold Drill Intersections from 2019 Exploration Program at the Bolanitos Mine, Guanajuato, Mexico May 22, 2019
Endeavour Silver Updates Mineral Reserve and Mineral Resource Estimates for its Operating Mines and Development Projects and Reports Initial Mineral Resource Estimate for New Parral Properties February 7, 2018
Endeavour Silver Provides 2018 Production and Cost Guidance Targeting 20% Increase in Production January 26, 2018

Aerial view:

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