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Honduras
San Andres Mine

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 Location:
18 km W from Santa Rosa de Copán, Honduras

  Address:
Barrio El Calvario, 4 Ave. 3-4 Calle La Union
Santa Rosa De Copán
Honduras
99999
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Personnel
  • Filings & News

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Overview

StageProduction
Mine TypeOpen Pit
Commodities
  • Gold
Mining Method
  • Truck & Shovel / Loader
Processing
  • Heap leach
  • Carbon in column (CIC)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life9 years (as of Jan 1, 2020)
Latest NewsAura Minerals Provides Further Update Regarding Operations in Honduras     April 28, 2020


Owners

Source: p. 28
CompanyInterestOwnership
Aura Minerals Inc. 100 % Indirect
The Mine’s surface and mineral rights are owned by Minerales de Occidente, S.A. de C.V. (“Minosa”), a wholly-owned indirect subsidiary of Aura existing under the laws of Honduras.

Deposit Type

  • Epithermal
  • Vein / narrow vein


Summary:

The San Andrés deposit is classified as an epithermal gold deposit associated with extension structures within tectonic rift settings. These deposits commonly contain gold and silver mineralization, which is associated with banded quartz veins. At the Mine, however, silver does not occur in significant economic quantities. Gold occurs in quartz veins predominantly comprised of colloform banded quartz (generally chalcedony with lesser amounts of fine comb quartz, adularia, dark carbonate, and sulphide material). The gold mineralization is deposited as a result of the cooling and interaction of hydrothermal fluids with groundwater and the host rocks. The hydrothermal fluids may have migrated some distance from the source; however, there is no clear evidence at the Mine that the fluids or portions of the fluids have been derived from magmatic intrusions.

The rocks hosting the San Andrés deposit have been oxidized near surface as a result of weathering. The zone of oxidation varies in depth from 10 m to more than 100 m. The zone of oxidation is generally thicker in the East Ledge deposit compared to the Twin Hills deposit.

In the oxide zone, the pyrite has been altered to an iron oxide such as hematite, goethite, or jarosite. The oxide zone generally overlies a zone of partial oxidation, called the mixed zone, which consists of both oxidized and sulphide material. The mixed zone may not occur continuously, but where it is present, it reaches thicknesses of over 50 m. below the zone of oxidation; the gold is commonly associated with sulphide minerals such as pyrite. The sulphide, or “fresh”, zone lies below the mixed zone.

The gold contained in the oxide zone is amenable to extraction by heap leaching using a weak cyanide solution. The gold recovery is reduced in the mixed zone as a result of the presence of sulphide minerals and the gold cannot currently be recovered economically from the sulphide zone by heap leaching.

High clay content in the ore, resulting from alteration, is detrimental to the heap leaching process because of reduced through-put rates in the crushing plant and reduced permeability in the heap leach operation. This poor leaching situation is resolved by agglomerating the crushed ore by adding cement to increase the permeability of the heap prior to leaching.

Based on metallurgical studies, the gold is primarily contained in electrum as fine-grained particles. The particle size of the electrum grains varied from 1 micron (“µ”) x 1 µ up to 10 µ x 133 µ. One native gold grain was noted. The silver generally occurs at about the same grade as gold and the correlation between silver and gold is low at 0.24. Silver is not considered important because of the lower price for silver compared to gold and the lower metal recovery of silver.


Mining Methods

  • Truck & Shovel / Loader


Summary:

Mining at San Andrés is by conventional open pit methods. Historical production rates for the years 2009 to 2013 averaged approximately 13,000 t of ore and 10,000 t of waste produced daily with generally continuous mining 24 hours a day for 360 days per year.

The San Andrés Mine is anticipating a material expansion in ore throughput from approximately 5Mtpa to 7Mtpa. This expansion was justified by the improved incremental economics with modest capital investment.

Mine production utilizes conventional drill and blasting methods with excavation on 6m high benches. Blasted material is then loaded via shovels and excavators onto haul trucks and is hauled to one of two jaw crushers utilizing a contract haul fleet.


Crushing and Grinding


Processing

  • Heap leach
  • Carbon in column (CIC)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Source: Subscription required

Summary:

All of the ore is processed through a two stage crushing circuit and transported on conveyors before being stacked as the final product sized at 80% passing 2.5 inches. The crushing and conveying circuit is designed for a nominal capacity of 1,100 t/h, which is adequate for the expanded production rate if operating at approximately 74% overall utilisation rate. For the expansion, most of the capital investment is applied to improve the secondary screening and crushing plant in order to consistently achieve or exceed 74% utilisation factor.

After the ore has been crushed it is treated with 2.5 to 4.0 kg/t of cement and 1.5 to 3.5 kg/t of lime before reaching the agglomerators where the ore is retained and mixed while adding an intermediate process solution to achieve the optimum moisture of 18%. The process solution contains up to 400 ppm cyanide solution.

The ore is stacked on the leach pad in 8 m lifts on previously leached ore that has been ripped and prepared ........

Recoveries & Grades:

CommodityParameter201920182017201620152014
Gold Head Grade, g/t 0.480.420.390.450.480.48
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Production:

CommodityUnits201920182017201620152014
Gold oz  ......  Subscription required  ......  Subscription required82,26978,32783,52188,813
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics201920182017201620152014
Total tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required11,913,532 t10,528,156 t9,531,610 t
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required6,531,161 t6,202,143 t6,151,236 t
Waste  ......  Subscription required  ......  Subscription required  ......  Subscription required5,382,371 t4,326,013 t3,380,374 t
Stripping / waste ratio  ......  Subscription required  ......  Subscription required  ......  Subscription required0.82 0.7 0.55
Tonnes processed  ......  Subscription required  ......  Subscription required  ......  Subscription required6,459,139 t6,149,421 t6,167,074 t
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required18,600 t
Subscription required - Subscription is required.

Reserves at December 31, 2019:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven & Probable Oxide 46,474 kt Gold 0.48 g/t 711 koz
Proven & Probable Mixed 13,796 kt Gold 0.63 g/t 279 koz
Proven & Probable Total 59,670 kt Gold 0.52 g/t 991 koz
Measured & Indicated Oxide 56,998 kt Gold 0.48 g/t 878 koz
Measured & Indicated Mixed 24,629 kt Gold 0.58 g/t 460 koz
Measured & Indicated Total 81,627 kt Gold 0.51 g/t 1,338 koz
Inferred Oxide 2,608 kt Gold 0.9 g/t 76 koz
Inferred Mixed 5,144 kt Gold 0.72 g/t 120 koz
Inferred Total 7,752 kt Gold 0.78 g/t 196 koz

Commodity Production Costs:

CommodityUnits201920182017201620152014
Cash costs Gold USD  ......  Subscription required  ......  Subscription required 849 / oz 821 / oz 779 / oz 744 / oz
Subscription required - Subscription is required.

Financials:

Units201920182017201620152014
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 11.7   6.43  
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 93.1   101.58  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Sales margin M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 15.1  
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Heavy Mobile Equipment:

Mine Management:

Job TitleNameEmailProfileRef. Date
....................... Subscription required ....................... Subscription required ....................... Subscription required Subscription required Sep 21, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 21, 2020
....................... Subscription required ....................... Subscription required Subscription required Sep 21, 2020
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required 2019
Subscription required 2018
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 2019
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Annual Information Form 2017
Financial Review 2017
Management Discussion & Analysis 2017
Annual Information Form 2016
Corporate Presentation 2016
Management Discussion & Analysis 2016
Annual Information Form 2015
Management Discussion & Analysis 2015
Technical Report 2014
Subscription required - Subscription is required.

News:

NewsDate
Aura Minerals Provides Further Update Regarding Operations in Honduras April 28, 2020
Aura Minerals Provides Update Regarding Operations in Honduras April 20, 2020
Aura Resumes Limited Operations at San Andres Gold Mine February 11, 2019
Aura Minerals Announces Suspension of Operations at San Andres December 10, 2018
Aura Minerals Announces Resumption of Operations at San Andres Mine October 30, 2018
Aura Minerals Announces Suspension of Operations in San Andres, Honduras October 22, 2018

Aerial view:

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