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Bolivia
Don Mario Mine

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 Location:
127 km NE from San José de Chiquitos, Bolivia

  Regional Office:
Calle Tucuman (6 Este) N° 7 Zona: Equipetrol
Santa Cruz De La Sierra
Bolivia
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
  • Production
  • Reserves
  • Costs & Financials
  • Fleet
  • Personnel
  • Filings & News

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Overview

StatusCare and Maintenance
Mine TypeOpen Pit
Commodities
  • Gold
  • Copper
  • Silver
Mining Method
  • Truck & Shovel / Loader
Processing
  • Centrifugal concentrator
  • Flotation
  • Carbon in leach (CIL)
  • Cyanide (reagent)
Mine Life3 years (as of Jan 1, 2021)
During fiscal 2020, Don Mario produced 2,317 ounces of gold compared with 32,932 ounces of gold during fiscal 2019. Gold production decreased by 93% primarily due to Don Mario mine being put temporarily under care and maintenance since the second quarter of fiscal 2020.
Latest NewsOrvana Reports First Quarter Results; Provides El Valle and Carlés Exploration Update     February 10, 2020


Owners & OPERATOR

Source: p. 11
CompanyInterestOwnership
Orvana Minerals Corp. 100 % Indirect
Empresa Minera Paititi S.A. (operator) 100 % Direct
Through its wholly-owned subsidiary, Empresa Minera Paititi S.A. (“EMIPA”), the Company owns and operates the Don Mario Mine located in south-eastern Bolivia.

Deposit Type

  • Vein / narrow vein
  • IOCG


Summary:

The Don Mario property is underlain by Lower to Middle Proterozoic metamorphic rocks of the Cristal Sequence that comprise a portion of the Bolivian Shield’s Adventura Complex. The Cristal Sequence is composed of medium to high grade metasedimentary units such as biotite schist, mica schist, quartzite, biotite–plagioclase gneiss and calcsilicates gneiss, as well as lesser amounts of pegmatite and amphibolite dikes. The Cristal Schist belt subunit hosts the Don Mario mine’s Upper and Lower Mineralized Zones as well as the nearby CF, Don Mario North, and Don Mario South gold prospects (Wright et al., 2009).

Mining and exploration programs to date on the property have shown the Don Mario deposit to consist of the gold-enriched LMZ and the copper-enriched UMZ. The LMZ is characterized by a well-developed northwest striking and steeply northeast dipping structural/lithologic corridor that constrains gold-coppersilver mineralization as well as distinctive alteration assemblages. Alteration associated with gold-coppersilver mineralization commonly takes the form of iron carbonate, white mica, biotite, quartz, albite, andalusite, staurolite, garnet, cordierite, gedrite and anthophylllite-cummingtonite. Spatial disposition of the LMZ and UMZ deposits may be of structural derivation, with the calc- silicate dominated and synclinally folded UMZ host sequence representing a shearing- associated “flower structure” above the sheared LMZ.

Past workers have characterized mineralization at the Don Mario deposit as being structurally focused or shear zone related. However, as outlined by Wright et al. (2009), alternative views on deposit genesis include skarn association, banded iron formation-hosted structural association, and deformed, syngenetic massive sulphide association,. In contrast to these, the deposit was more recently classified by Arce Burgoa (2009) as being a deformed example of the Iron Ore copper Gold (IOCG) association.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The current mining methods used at Don Mario UMZ are conventional open pit mining. Ore and waste are loaded into 20 to 25 tonne nominal capacity trucks using a 10 tonne nominal capacity front end loader. The ore is hauled directly to the process plant ore stockpile area and waste is hauled directly to the waste dump facility. Any oxide or low grade material is hauled to various surface stockpiles located near the plant and mine.


Crushing and Grinding
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1
SAG mill 5.5m x 2.7m 1
Ball mill 3.6m x 6m 1

Summary:

Crushing
Ore extracted from the UMZ pit is stockpiled and classified according to mineralogy, gold, copper, and/or deleterious element grades. When possible, a suitable ore blend is prepared to feed the mill. A front end loader collects the ore from the plant stockpile and delivers it to the crusher feed bin equipped with a 500 mm aperture slotted grizzly screen. The crusher feed bin has an apron feeder that feeds the primary single toggle jaw crusher and any apron feeder spillage is collected on a conveyor belt below. The jaw crusher set to 153 mm. The spillage and the crushed ore which is less than 90 mm in size are transferred to the next conveyor belt equipped with load cell type belt weightometer and this belt discharges into the 800 ton fine ore mill feed bin. A level indicator and controller in the mill feed bin controls the apron feeder feed rate to the jaw crusher to maintain the set level in the bin.

Grinding
Dry crushed ore at P80 < 90 mm is fed to the SAG mill (5.5 m internal diameter by 2.7 m effective grinding length) by means of a conveyor belt equipped with a load cell type belt weightometer. The load signal controls the feed rate from the mill feed bin discharge conveyor onto the conveyor belt feeding the SAG mill. The pulp density in the mill is controlled by adding process water to the SAG mill inlet. Oversize material is removed from the mill discharge pulp with the discharge end trommel screen. The oversize fraction is delivered back to the SAG mill inlet, while the undersize fraction flows to the common pump box for both the SAG mill discharge and the ball mill discharge. The combined mill discharge is pumped to a cluster of three 380 mm diameter Krebs hydrocyclones for classification (there is one on standby). The cyclone overflow reports to the flotation section and the cyclone underflow is split, with part reporting to the gravity concentration section (approximately 100 tph) and the balance reporting to the ball mill feed. The ball mill has a 3.6 m internal diameter by 6 m effective grinding length. The cyclone overflow at 40% solids has a size of P80 < 106 µm.


Processing

  • Centrifugal concentrator
  • Flotation
  • Carbon in leach (CIL)
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

Don Mario processing plant consists of the following sequence of macro unit operations:
• Crushing and Screening
• Grinding and Cycloning
• Gravity Concentration
• Flotation Concentration
• Tailings Storage Facility (TSF).

The CIL circuit was placed on care and maintenance in April 2011 when the Company commenced mining the metallurgically more complex UMZ.

In the first quarter of fiscal 2016, a metallurgical testing program was completed and the results showed that re-commissioning of the carbon-in-leach (“CIL”) circuit in use until 2011 to process the LMZ resource material would maximize the value of the then recently defined Don Mario resource estimates (the “CIL Project”). The Company began construction on the CIL Project in fiscal 2016 and successfully completed re-commissioning in the second quarter of fiscal 2017.

Gravity Concentration
Milling reduces the size of the ore to less than one mm and liberates metallic go ........

Recoveries & Grades:

CommodityParameter202020192018201720162015
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Gold Head Grade, g/t 1.071.512.162.361.441.32
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Copper Head Grade, % 0.720.950.951.2
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Head Grade, g/t 9.420.125.2
Subscription required - Subscription is required.

Production:

CommodityProductUnits202020192018201720162015
Gold Metal in doré oz  ......  Subscription required  ......  Subscription required  ......  Subscription required38,746
Copper Metal in concentrate k lbs  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
Silver Metal in doré oz  ......  Subscription required
Gold Metal in concentrate oz 21,10219,084
Silver Metal in concentrate oz  ......  Subscription required  ......  Subscription required
Subscription required - Subscription is required.

Operational Metrics:

Metrics202020192018201720162015
Ore tonnes mined  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required679,512 dmt938,492 dmt
Tonnes milled  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required806,187 dmt837,722 dmt
Daily milling rate  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required2,436 dmt2,532 dmt
Daily processing capacity  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required2,600 dmt
Subscription required - Subscription is required.

Reserves at September 30, 2019:

CategoryOreTypeTonnage CommodityGradeContained Metal
Proven Stockpiles 2,032 kt Gold 1.85 g/t 120.9 koz
Proven Stockpiles 2,032 kt Copper 1.89 % 38,438 t
Proven Stockpiles 2,032 kt Silver 49.32 g/t 3,221 koz
Measured Stockpiles 2,139 kt Gold 1.85 g/t 127.3 koz
Measured In-Situ (OP) 661 kt Gold 1.55 g/t 33 koz
Measured Stockpiles 2,139 kt Copper 1.89 % 40,461 t
Measured In-Situ (OP) 661 kt Copper 0.11 % 705 t
Measured Stockpiles 2,139 kt Silver 49.32 g/t 3,391 koz
Measured In-Situ (OP) 661 kt Silver 2.05 g/t 44 koz
Indicated In-Situ (OP) 725 kt Gold 1.5 g/t 35 koz
Indicated In-Situ (OP) 725 kt Copper 0.11 % 876 t
Indicated In-Situ (OP) 725 kt Silver 2 g/t 47 koz
Measured & Indicated Stockpiles 2,139 kt Gold 1.85 g/t 127.3 koz
Measured & Indicated In-Situ (OP) 1,386 kt Gold 1.52 g/t 68 koz
Measured & Indicated Stockpiles 2,139 kt Copper 1.89 % 40,461 t
Measured & Indicated In-Situ (OP) 1,386 kt Copper 0.11 % 1,581 t
Measured & Indicated Stockpiles 2,139 kt Silver 49.32 g/t 3,391 koz
Measured & Indicated In-Situ (OP) 1,386 kt Silver 2.02 g/t 90 koz
Inferred In-Situ (OP) 241 kt Gold 1.27 g/t 10 koz
Inferred In-Situ (OP) 241 kt Copper 0.14 % 337 t
Inferred In-Situ (OP) 241 kt Silver 1.79 g/t 14 koz

Commodity Production Costs:

CommodityUnits202020192018201720162015
Cash costs Copper USD 1.93 / lb 2.22 / lb
Cash costs Silver USD 5.06 / oz 14.4 / oz
Cash costs Gold USD 1,023 / oz 948 / oz
Cash costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 663 / oz† 863 / oz†
All-in sustaining costs (AISC) Copper USD 2.25 / lb 2.45 / lb
All-in sustaining costs (AISC) Silver USD 17.5 / oz 15.9 / oz
All-in sustaining costs (AISC) Gold USD 1,204 / oz 1,053 / oz
All-in sustaining costs (sold) Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 871 / oz† 1,249 / oz†
All-in costs Copper USD 2.35 / lb 2.46 / lb
All-in costs Silver USD 18.3 / oz 15.9 / oz
All-in costs Gold USD 1,264 / oz 1,058 / oz
All-in costs Gold USD  ......  Subscription required†  ......  Subscription required†  ......  Subscription required† 1,050 / oz† 1,378 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units202020192018201720162015
Capital expenditures M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 40.4  
Sustaining costs M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required
Revenue M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required 51.6  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required -0.94  
Subscription required - Subscription is required


Heavy Mobile Equipment as of January 27, 2017:
HME TypeModelSizeQuantityLeased or
Contractor
Dozer ....................... Subscription required 1
Dozer ....................... Subscription required 1
Drill ....................... Subscription required 1
Drill ....................... Subscription required 1
Excavator ....................... Subscription required 1
Grader ....................... Subscription required 1
Loader (FEL) ....................... Subscription required 10 t 2
Loader (FEL) ....................... Subscription required 10 t 1
Rockbreaker ....................... Subscription required 1
Truck (haul) 25 t 10 Leased
Truck (haul) ....................... Subscription required 25 t 2
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Dec 25, 2020
Subscription required - Subscription is required.

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2020
................................... Subscription required 2019
................................... Subscription required 2019
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
................................... Subscription required 2018
Corporate Presentation 2017
Management Discussion & Analysis 2017
Press Release 2017
Technical Report 2017
Management Discussion & Analysis 2016
Subscription required - Subscription is required.

News:

NewsDate
Orvana Reports First Quarter Results; Provides El Valle and Carlés Exploration Update February 10, 2020

Aerial view:

Subscription required - Subscription is required.

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