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Bolivia
Don Mario Mine

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

  Regional Office:
Edificio Centro Empresarial Equipetrol, Piso 3, oficina 301
Santa Cruz de la Sierra
Bolivia
WebsiteWeb
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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
  • Filter press plant
  • Acid leach
  • Electrolysis
  • Crush & Screen plant
  • Smelting
  • Carbon re-activation kiln
  • Sulfuric acid (reagent)
  • Flotation
  • Counter current decantation (CCD)
  • Agitated tank (VAT) leaching
  • Acid tank leaching
  • Carbon in column (CIC)
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
Mine Life3 years (as of Jan 1, 2022)
The Don Mario Mine Complex temporarily suspended operations at the end of the first quarter of fiscal 2020. A care and maintenance (“C&M”) program was implemented at the end of first quarter of fiscal 2020 (late December 2019) and continues today (Q1 2022).

Update on the Don Mario Property includes:
• Oxide Stockpile Project - OSP:
- Oxides Stockpile Project quality assurance (metallurgical) testing is currently in progress. Decision on the project is expected in fiscal 2022
- Subject to favourable completion of technical, economic and funding analysis, OSP is expected to require twelve months of development to start commercial production.
• Tailings Reprocessing Project – TRP:
- Pre-feasibility study planned by H1 FY2023.
Latest NewsOrvana Announces Filing of Amended Technical Report     March 15, 2022


Owners

Source: p. 13
CompanyInterestOwnership
Orvana Minerals Corp. 100 % Indirect
Empresa Minera Paititi S.A. (operator) 100 % Direct
The Don Mario Property is owned and managed by Empresa Minera Paititi S.A. (EMIPA). Empresa Minera Paititi S.A. (EMIPA) is a wholly owned subsidiary of Orvana.

Deposit Type

  • IOCG
  • Vein / narrow vein
  • Tailings


Summary:

DEPOSIT TYPES
The deposit was more recently classified by Arce-Burgoa and Goldfarb (2009), as being a deformed example of the Iron Ore Copper Gold (IOCG) association.

The two main deposits types present on the Don Mario Property are exemplified by the copper-dominated UMZ deposit that shows direct association with a large calc-silicate zone, and the gold-dominated LMZ deposit that occurs beneath the UMZ and shows direct association with shear-focused silicification, calcsilicate, potassic, and iron oxide alteration. The Las Tojas and Cerro Felix deposits are similar in style and association with the LMZ, but no substantive additional examples of the UMZ style have been identified on the Property to date.

Tailings Storage Facility (TSF)
Tailings are not a “deposit type” in the conventional sense but in this case, for the purposes of considering Don Mario’s TSF content a Mineral Resource, they are described as an accumulation of loose material with grain size finer than sand, mainly composed by silt size material and less than 20% of clays. The tailings material humidity can vary from 20.8% to 51.4% (Sanchez et al., 2018).

The executed laboratory tests evidence that the tailings can be grouped into fine tailings and coarse tailings, classified respectively as silty sands and silts with low plasticity with the following characteristics:
- The coarse tailings, classified as silty sands, have a field density of 1.468 g/cm3 to 1.712 g/cm3,
a specific gravity of 2.81 to 2.93 and hydraulic conductivity of 2.81 E-04 cm/s to 4.03 E-05 cm/s.
- The fine tailings, classified as silt with low plasticity, have a field density of 1.157 g/cm3 to
1.649 g/cm3, a specific gravity of 2.45 to 2.91 and hydraulic conductivity of 2.28 E-04 cm/s to
1.10 E-06 cm/s.

Oxide Stockpiles
The oxide stockpiles provide for a rather unique and unconventional deposit type. Because the mineralized material that was used to build the stockpiles was well defined as to tonnes and grade, each of the stockpiles is in itself a “mineral deposit”. These oxide stockpiles form a rather unique deposit type because mines seldom stockpile mineralized material that has such high-grade mineralization. Consequently, these stockpiles cannot be evaluated using the traditional exploration techniques and tools utilized for in-situ mineral deposit.

Mineralization
Four principal mineral deposits on the Don Mario property have contributed to commercial mining operations to date. The most significant of these are the UMZ and LMZ. The CF deposit is located 500 meters northwest along strike from the LMZ and UMZ and supported a limited amount of open pit mining from 2009 to 2011. All occur within the Cristal Schist Belt and the Don Mario Shear Zone. Orvana also mined LMZ style mineralization from the Las Tojas (LT) deposit during the 2009 to 2011 period. This deposit i located about 12 km northwest of Don Mario mine and is associated with an un-named shear zone within the Eastern Schist Belt that is separate from, but parallels, the Cristal Schist Belt. Summary points relating to the main gold-copper-silver deposits of the Don Mario property are highlighted below:

Don Mario Shear Zone (Cristal Schist Belt):
- LMZ gold deposit: mined out predominantly by underground methods in 2009.
- UMZ copper-gold-silver deposit: overlies the LMZ.
- CF gold deposit: 0.5 km north of LMZ and UMZ; saw limited open pit production from 2009 to 2011; CF was a low copper grade and high gold grade deposit amenable for the CIL plant.

Unnamed Shear Zone (Eastern Schist Belt):
- LT gold deposit – mined out in 2011 & 2019.
- Oscar gold prospect northwest of LT has not been thoroughly tested by drilling and trenching to date.
- In addition to the known deposits, several geophysical and geochemically defined targets for exploration drilling have been identified along the 40 km length of this schist belt.

The UMZ forms a prominent, oval shaped, treeless hill that is oriented at approximately 315º, parallel to the regional shear fabric trend of the Cristal Schist Belt. The mineralized zone plunges northwest at approximately 15º. The UMZ has been divided into 9 main rock types, the most prevalent of which are calc-silicates such as diopside tremolite rock and massive tremolite rock plus dolomite/ophicalcite and talc schist.

The main UMZ calc silicate bearing zone is approximately 500 m long and forms the Cerro Don Mario, which is a ridge approximately 120 m high. This rock package has a maximum horizontal width of approximately 150 m and ranges from 5 m to 100 m thick. Part of the magnesio-silicate alteration and UMZ mineralization is weathered and is divided into four mineralization zones based on mineralogy:

- The Porous zone is characterized by vuggy cavities left by the dissolution of calcite and locally abundant masses of white and orange brown amorphous zinc carbonates and hydroxides, including smithsonite.

- The Oxide zone is characterized by abundant malachite with lesser chrysocolla, azurite, native copper, cuprite, pitch-imonite, and silver sulfosalts.

- The Transition zone features traces of pyrite, bornite, sphalerite, and galena withweathered limonite and chalcocite coatings, as well as minor copper oxides.

-The Sulphide zone consists of dark green tremolite with bornite, chalcopyrite, and sphalerite. Gold and silver grades are associated with chalcopyrite and bornite mineralization.

The LMZ mineralization is strata bound within a distinct package of metamorphic strata that consists of four mineralized subdivisions, that are readily distinguishable from hanging wall and footwall units.

The most important distinguishing feature of the LMZ units from the hanging wall and footwall schists is the complete absence of muscovite. The contacts are well defined over 1 m to 3 m widths with a drop in muscovite from 20% of the rock to only trace amounts. While the LMZ is characterized by the presence of Au, Ag, Cu, Pb, Zn Bi, W, and Mo, there is very little or no enrichment of these elements in the wall rocks.

Overall, unit, LMZ -quartz-amphibole-garnet-magnetite-cordierite ± biotite rock, is the main host of the mineralization, and has been termed. magic rock. by the project geologists. Assay results indicate that this unit hosts most of the economically significant mineralization below the 300 m level. Unit exhibits mineralogical and textural variability within individual drill holes and along strike. Gedrite-cordierite layers range in thickness from less than 0.10 m to more than 3.0 metres with the most common thickness ranging from 0.10 m to 0.80 metres. Due to metamorphism, recrystallization, accompanying potassic alteration, and later shearing of the quartz amphibole section, the protolith is indeterminate.

Unit LMZ quartz-garnet-amphibole-biotite is distinguished from unit LMZ quartz biotite ± sillimanite rock mainly on the basis of containing less than 5% almandine garnet, and the absence of sillimanite, which can comprise up to 20% of the latter unit. Sillimanite is regarded to have been a major component of the rock prior to potassic alteration.

The UMZ and LMZ are separated by sections of dark greenish-black, fine grained, well foliated chlorite schist ranging in thickness from less than one metre to greater than 10 metres. Similar schists are intercalated with LMZ lithologies with cross-cutting relationships, and all are grouped into Unit chlorite-serpentine-talc ± amphibole schist.


Mining Methods

  • Truck & Shovel / Loader


Summary:

The Don Mario Property currently does not have any in-situ Mineral Resources or Mineral Reserves. The only Mineral Resources or Mineral Reserves currently on the Property are hosted in five of the six oxide stockpiles and in the tailings contained within the TSF.

Tailings Reprocessing Project (TRP)
No mining plan is presented for the TRP because it is not sufficiently advanced for the development of a mining plan.

Oxide Stockpiles
The planned mining method for the oxide stockpiles consists of loading conventional end dump trucks with either a wheel loader or an excavator on a mucking schedule from various oxide stockpiles, in order to achieve the desired plant feed blend after haulage from stockpile locations to the crusher area. The goal is to obtain an average blending of Au, Cu an Ag grades with oxide gangue minerals that will ensure optimal metal recoveries.

Loading and transportation activities are planned for daily 12 hour shifts. The Company targets delivering a monthly average of 59,000 tonnes to the blended stockpile. The blended ore will come all thee various OSPs and be blended to achieve the proper mix of grade and oxidized gangue minerals to maximize recoveries. The Company expects full production to take a four month ramp up period.


Crushing and Grinding
Flow Sheet: Source
Crusher / Mill TypeModelSizePowerQuantity
Jaw crusher 1

Summary:

Ore Crushing & Grinding
Oxide stockpiles containing run of mine (ROM) material will be fed to the jaw crusher and then fed to the grinding circuit where the circuit will discharge material at a P-90 of minus 150 mesh.


Processing

  • Filter press plant
  • Acid leach
  • Electrolysis
  • Crush & Screen plant
  • Smelting
  • Carbon re-activation kiln
  • Sulfuric acid (reagent)
  • Flotation
  • Counter current decantation (CCD)
  • Agitated tank (VAT) leaching
  • Acid tank leaching
  • Carbon in column (CIC)
  • Carbon in pulp (CIP)
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The Oxides Stockpiles Project quality assurance (metallurgical) testing was completed in the second half of November 2021. Subject to approval and financing, construction is planned for fiscal 2023, with a 3-year production life between 2024 and 2026.

A listing of the basic circuits, based on preliminary conclusions from metallurgical research to date, that will be installed in the revised and upgraded processing plant flowsheet in order to achieve expected recoveries are:
- Crushing/Milling/Screening.
- Talc Flotation (intermittent).
- Acid Leaching.
- Acid Pulp Filtering.
- Copper Solvent Extraction.
- Copper Electro-Winning.
- Lime Neutralization.
- Cyanide Leaching.
- Filtering and Silver Precipitation.
- Carbon in Column (CIC).
- Carbon in Pulp (CIP).
- Gold-Silver Strip Electro-Winning & Smelting.
- DETOX.
- Tailings Disposal.

The comminution circuit discharges to the Wemco flotation cel ........

Recoveries & Grades:

CommodityParameter202020192018201720162015
Gold Recovery Rate, %  ......  Subscription required  ......  Subscription required90.27456.353.8
Gold Head Grade, g/t  ......  Subscription required  ......  Subscription required2.162.361.441.32
Copper Recovery Rate, %  ......  Subscription required  ......  Subscription required53.760.662.274.4
Copper Head Grade, %  ......  Subscription required  ......  Subscription required0.720.950.951.2
Silver Recovery Rate, %  ......  Subscription required  ......  Subscription required65.873.463.3
Silver Head Grade, g/t  ......  Subscription required  ......  Subscription required9.420.125.2

Production:

CommodityProductUnits202020192018201720162015
Gold Metal in doré oz  ......  Subscription required  ......  Subscription required45,12538,746
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 required745,846 dmt856,018 dmt718,692 dmt679,512 dmt938,492 dmt
Tonnes milled  ......  Subscription required739,635 dmt719,328 dmt668,376 dmt806,187 dmt837,722 dmt
Daily milling rate  ......  Subscription required2,185 dmt2,188 dmt2,088 dmt2,436 dmt2,532 dmt
Daily processing capacity  ......  Subscription required2,600 dmt
Subscription required - Subscription is required.

Reserves at September 30, 2021:
Indicated and Inferred: Highlighted Base Case Au 0.3 g/t Cutoff considered for mine life.

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 49.3 g/t 3,221 koz
Measured Stockpiles 2,184 kt Gold 1.84 g/t 129 koz
Measured Stockpiles 2,184 kt Copper 1.89 % 41,283 t
Measured Stockpiles 2,184 kt Silver 49.3 g/t 3,461 koz
Indicated Tailings 3,677 kt Gold 0.48 g/t
Indicated Tailings 3,677 kt Copper 0.53 %
Indicated Tailings 3,677 kt Silver 4.79 g/t
Inferred Tailings 5,474 kt Gold 0.45 g/t
Inferred Tailings 5,474 kt Copper 0.4 %
Inferred Tailings 5,474 kt Silver 4 g/t

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† 890 / oz† 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† 1,087 / oz† 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† 1,287 / oz† 1,050 / oz† 1,378 / oz†
† Net of By-Product.
Subscription required - Subscription is required.

Financials:

Units202020192018201720162015
Capital expenditures M USD  ......  Subscription required  ......  Subscription required12.7   12.2   27.1   40.4  
Sustaining costs M USD  ......  Subscription required7.1   5.2  
Revenue M USD  ......  Subscription required  ......  Subscription required65.6   66.4   34.3   51.6  
Pre-tax Income M USD  ......  Subscription required  ......  Subscription required6.1   11.9   1.5   -0.9  
Subscription required - Subscription is required


Proposed Heavy Mobile Equipment as of February 28, 2022:
HME TypeModelSizeQuantity
Excavator ....................... Subscription required 1.76 cu. m ....................... Subscription required
....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required ....................... Subscription required
....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

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

Staff:

EmployeesContractorsTotal WorkforceYear
Subscription required Subscription required Subscription required 2021
Subscription required Subscription required Subscription required 2020
Subscription required Subscription required Subscription required 2019
Subscription required Subscription required Subscription required 2018

Corporate Filings & Presentations:

DocumentYear
Corporate Presentation 2022
Technical Report 2022
................................... 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
Annual Information Form 2018
Corporate Presentation 2018
Management Discussion & Analysis 2018
Press Release 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 Announces Filing of Amended Technical Report March 15, 2022
Orvana Reports First Quarter Results; Provides El Valle and Carlés Exploration Update February 10, 2020

Aerial view:

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