Bolivia

EMIPA/Don Mario Mine

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Overview

Mine TypeOpen Pit
Commodities
  • Gold
  • Copper
  • Silver
Mining Method
  • Truck & Shovel / Loader
Production Start... Lock
Mine Life... Lock
ShapshotIn the first quarter of fiscal 2020 the Orvana made a decision to temporarily suspend mining and milling operations at Don Mario. Since then, Don Mario continues in care and maintenance, transitioning to the Oxides Stockpile Project, consisting of a plant expansion to treat ore stockpiled from previous years of mining activity.

The Oxides Stockpile Project, consisting of a plant expansion to treat ore stockpiled in the Don Mario Operation from previous years of mining activity, is projected to operate for 35 months, starting after a 13-month construction period that the Company expects to start in July 2024, subject to the completion of sufficient financing.

The Orvana Minerals is also evaluating the potential reprocessing of tailings accumulated in the Don Mario Tailings Storage Facility (TRP).

Processing the oxides stockpile, plus the tailings reprocessing could add 6-7-year of mine life to Don Mario, allowing for exploration opportunities.

Owners

SourceSource
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 Orvana Minerals owns and operates Don Mario Operation.

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.

Reserves

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Mining Methods

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Comminution

Crushers and Mills

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Processing

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Production

Don Mario is in care and maintenance since the first quarter of fiscal 2020.
CommodityProductUnits202020192018201720162015
Gold Metal in doré oz  ....  Subscribe32,93245,12538,746
Copper Metal in concentrate k lbs 3,1108,38710,47816,473
Silver Metal in doré oz 135,872
Gold Metal in concentrate oz 21,10219,084
Silver Metal in concentrate oz 381,523431,295

Operational metrics

Metrics202020192018201720162015
Daily milling rate  ....  Subscribe2,185 dmt2,188 dmt2,088 dmt2,436 dmt2,532 dmt
Ore tonnes mined  ....  Subscribe745,846 dmt856,018 dmt718,692 dmt679,512 dmt938,492 dmt
Tonnes milled  ....  Subscribe739,635 dmt719,328 dmt668,376 dmt806,187 dmt837,722 dmt
Daily processing capacity  ....  Subscribe2,600 dmt

Production Costs

CommodityUnits2020201920182017
Cash costs Copper USD
Cash costs Silver USD
Cash costs Gold USD
Cash costs (sold) Gold USD  ....  Subscribe 1,256 / oz **   890 / oz **   663 / oz **  
All-in sustaining costs (AISC) Copper USD
All-in sustaining costs (AISC) Silver USD
All-in sustaining costs (AISC) Gold USD
All-in sustaining costs (sold) Gold USD  ....  Subscribe 1,361 / oz **   1,087 / oz **   871 / oz **  
All-in costs Copper USD
All-in costs Silver USD
All-in costs Gold USD
All-in costs Gold USD  ....  Subscribe 1,429 / oz **   1,287 / oz **   1,050 / oz **  
** Net of By-Product.

Financials

Units202220212020201920182017
Capital expenditures M USD  ....  Subscribe  ....  Subscribe  ....  Subscribe 2.9   12.7   12.2  
Sustaining costs M USD 1.2   7.1   5.2  
Revenue M USD  ....  Subscribe 45.3   65.6   66.4  
Pre-tax Income M USD  ....  Subscribe -3.9   6.1   11.9  

Heavy Mobile Equipment

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Personnel

Mine Management

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 2024
....................... Subscription required ....................... Subscription required Subscription required Jan 14, 2024

EmployeesContractorsTotal WorkforceYear
...... Subscription required ...... Subscription required ...... Subscription required 2022
...... 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

Aerial view:

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