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Uruguay
San Gregorio Mine

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 Location:
48 km NE from Tacuarembo, Uruguay

  Regional Office:
Echevarriarza 3535, Of. 1512
Montevideo
Uruguay
11300
Phone  ...  Subscription required
Fax+598-2577-0181
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 & Underground
Commodities
  • Gold
  • Silver
Mining Method
  • Truck & Shovel / Loader
  • Transverse stoping
  • Room-and-pillar
Processing
  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)
The reorganization process has been ongoing since June 2018. In August 2018, the Company’s wholly-owned Uruguayan subsidiary, Loryser SA (“Loryser”), placed its San Gregorio mining operations under care and maintenance. Under the Loryser reorganisation proceedings, the term for credit verification ended in September 2018. A court appointed intervenor validated all the creditors and filed a report on the assets and debts of Loryser in October 2018.
Latest NewsOrosur Mining Inc. – Uruguay Update     November 12, 2019


Owners

Source: p. 3
CompanyInterestOwnership
Orosur Mining Inc. 100 % Indirect
Minera San Gregorio S.A 100 % Direct

Deposit Type

  • Mesothermal
  • Orogenic
  • Vein / narrow vein


Summary:

The deposits discovered by Orosur to date in the San Gregorio project area are considered to be typical of mesothermal vein-style, or orogenic-style gold deposits.

The deposits located along the east-west to northwest trending SGFS are, from west to east, the Santa Teresa deposits, the Polvorín deposit, the Ombú deposit, the San Gregorio deposit and the Arenal deposit. Zapucay and Argentinita deposits lie along the extension of the one fold and thrust fault system to the east, with similar age of SGFS.

Gold mineralization at SGGP has occurred as infill of brittle fractures within favourable host rocks such as zones of silicification and mafic units. Brittle fracture has occurred within these zones in response to local extensional tectonics created by the intersection of different trending faults, faults with dikes and changes in the attitude of the fault itself. Intense brittle fracture, silicification and quartz veining are apparent in higher grade zones. At least 3 phases of fracturing and veining can be recognised from drill core.

The gold deposits are generally hosted within basement granulite and amphibolite facies within the upper plate of a large thrust fault that defines the contact with the younger granites to the north. Pyrite is the dominant sulphide, and gold grade is directly proportional to the pyrite content. The gold at all deposits is fine, and visible gold is rare. Other potentially deleterious elements are in low concentrations.

The northeast trend to the mineralization is apparent within the granites to the north of the main thrust, where the Sobresaliente and Castrillón deposits are located. These deposits are approximately 5 km and 7 km north of the San Gregorio mine site respectively.


Mining Methods

  • Truck & Shovel / Loader
  • Transverse stoping
  • Room-and-pillar


Summary:

Open pit mining is performed by conventional open pit methods, using drill and blast techniques to break the rock, and then load it by excavator on to 50 tonne trucks to be transported to appropriate destinations. Historically, mining and hauling from satellite pits around San Gregorio was performed by contractors with smaller mining equipment to match the equipment size, to the size of the pits. Over the past years, contractor mining of satellite pits and ore haulage became a significant cost item for the Corporation. So, during 2012, Orosur decided to acquire its own fleet of smaller mining loading and hauling equipment. Total capital expenditure to acquire this fleet was approximately US$4.5M and was funded by a leasing contract to be repaid in 36 months.

Underground mining at Arenal started in April 2013. Mining is performed according to conventional Inclined Room and Pillars (IRP), and Transverse Stopping methods. That includes development drifting, long-hole drilling, charging & blasting and finally ore mucking out.

The TS method consists of primary and secondary stopes. Primary stopes measure 50m long by 20m high by 20m wide. Secondary stopes have the same maximum dimensions, but include a 6m internal pillar. An 8m wide pillar is located between the primary and secondary stopes. The pillars allow backfill material to consist solely of waste rock, without requiring any cement. The primary stopes have a drill drift driven along both side of the stope. The secondary stopes reduce the amount of development by only developing one central drill drift for each stope. Mining commences in the central primary stope on the lowest mineralized level and continues in adjacent primary stopes. A 50m long stope will be immediately backfilled following mining. Backfill is dumped from the drill drift into the empty stope using a load-haul-dump (LHD) unit. Following completion of the primary stopes, mining of the adjacent secondary stopes commences. This pattern of extraction will continue vertically until the mineralized zone is depleted.

The IRP method is used along the footwall of the ore zone where the ore is on average less than 10m thick. The method uses a production drift, which is driven to the end of the ore zone. These production drifts are driven up to 8m wide with a shanty back on the hanging wall side of the drift to minimize overcut dilution. Once the production drift is complete on the level, the stopes (above the production drift) are then mined retreating toward the level access drift. The stopes, between the development levels, are 7.5m high by 15m long, followed by a 10m long pillar. The pillar ensures stability of the area without the need for backfill, which helps keep the operating costs low for this mining method.


Crushing and Grinding
Flow Sheet: Source


Processing

  • Agitated tank (VAT) leaching
  • Carbon in leach (CIL)
  • Elution
  • Carbon adsorption-desorption-recovery (ADR)
  • Solvent Extraction & Electrowinning
  • Cyanide (reagent)

Flow Sheet: Subscription required

Summary:

The ore treatment plant is a conventional carbon-in-leach (CIL) plant built by Minproc in 1996 and commissioned in January 1997. The plant comprises of a single-stage crushing circuit using a 500 mm aperture grizzly and a jaw crusher fed using a front end loader (FEL). The nominal crushed ore size is 100% passing 150 mm.

The crushed ore is reclaimed from the main stockpile using two ore feeders underneath the main surge stockpile onto a main feed conveyor and then fed into a 20 x 10 ft (D x L) semi-autogenous grind (SAG) and a 13 x 20 ft (D x L) ball mill circuit in an SAG/ball/crush (SABC) configuration. The SAG mill is in closed circuit with a scats crusher to prevent the buildup of critical sized material in the SAG mill. The ball mill runs in closed circuit with a bank of 15-inch hydrocyclones with cyclone underflow returning to the ball mill and cyclone overflow reporting through to the CIL circuit. The final product size target is 80% passing 150 µm.

The CIL ........

Recoveries & Grades:

CommodityParameter2018201720162015
Gold Recovery Rate, % 9593.492.592.4
Gold Head Grade, g/t 1.011.211.191.48

Production:
During FY 2019, the Company produced 3,029 oz gold from San Gregorio until the mine was pout in care and maintenance.

CommodityUnits20192018201720162015
Gold oz  ......  Subscription required27,58635,37135,77353,485
Silver oz  ......  Subscription required  ......  Subscription required  ......  Subscription required  ......  Subscription required
All production numbers are expressed as metal in doré.
Subscription required - Subscription is required.

Operational Metrics:

Metrics20192018201720162015
Annual processing capacity 1.03 Mt1.03 Mt1.03 Mt
Total tonnes mined 3,276 kt4,088 kt3,209 kt4,948 kt
Ore tonnes mined 760 kt934 kt926 kt1,182 kt
Waste 2,517 kt3,154 kt2,283 kt3,766 kt
Stripping / waste ratio 3.31 3.38 2.47 3.18
Tonnes processed 875 kt979 kt1,013 kt1,212 kt

Reserves at May 31, 2018:

CategoryTonnage CommodityGradeContained Metal
Proven 533,021 t Gold 0.87 g/t 14,855 oz
Probable 1,577,717 t Gold 1.61 g/t 81,431 oz
Proven & Probable 2,110,738 t Gold 1.42 g/t 96,286 oz
Measured 1,925,792 t Gold 1.81 g/t 112,072 oz
Indicated 9,522,625 t Gold 1.29 g/t 396,203 oz
Measured & Indicated 11,448,417 t Gold 1.38 g/t 508,288 oz
Inferred 2,269,769 t Gold 1.2 g/t 87,219 oz

Commodity Production Costs:

CommodityUnits2018201720162015
Cash costs Gold USD 970 / oz† 829 / oz† 877 / oz† 912 / oz†
Total cash costs Gold USD 989 / oz† 882 / oz† 891 / oz† 965 / oz†
All-in sustaining costs (AISC) Gold USD 1,453 / oz† 1,228 / oz† 1,069 / oz† 1,185 / oz†
† Net of By-Product.

Financials:

Units2018201720162015
Capital expenditures M USD 9.1   9.3   3.5   6.8  
Revenue M USD 37.1   44.2   42.9   65.9  
Gross profit M USD -1.1   4   0.8   -3.8  


Heavy Mobile Equipment as of May 31, 2016:
HME TypeModelQuantity
Drill (long hole) ....................... Subscription required ....................... Subscription required
Excavator ....................... Subscription required ....................... Subscription required
Loader (FEL) ....................... Subscription required ....................... Subscription required
Loader (FEL) ....................... Subscription required ....................... Subscription required
Loader (FEL) ....................... Subscription required ....................... Subscription required
Loader (FEL) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Truck (haul) ....................... Subscription required ....................... Subscription required
Subscription required - Subscription is required.

Mine Management:

Job TitleNameProfileRef. Date
....................... Subscription required ....................... Subscription required Subscription required Oct 6, 2021
....................... Subscription required ....................... Subscription required Subscription required Oct 6, 2021
Subscription required - Subscription is required.


Corporate Filings & Presentations:

DocumentYear
................................... Subscription required 2019
................................... Subscription required 2019
Annual Information Form 2018
Management Discussion & Analysis 2018
Annual Information Form 2017
Management Discussion & Analysis 2017
Annual Information Form 2016
Management Discussion & Analysis 2016
Technical Report 2010
Subscription required - Subscription is required.

News:

NewsDate
Orosur Mining Inc. – Uruguay Update November 12, 2019

Aerial view:

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