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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
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Fax+598-2577-0181
WebsiteWeb
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  • Overview
  • Owners
  • Geology
  • Mining
  • Processing
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  • Costs & Financials
  • Fleet
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  • 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
The reorganization process has been ongoing since June 2018. In August 2018, Orosur Mining Inc. 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. The Creditors Agreement was ratified by the Court in September 2019. Since then the Company has focused its activities on the implementation of the Creditors Agreement, and the sale of the assets of Loryser.
Loryser, continues to focus its activities on the implementation of the Creditors Agreement and the sale of its Uruguayan assets. Loryser is also continuing with the reclamation and remediation of the tailings dam which is nearing completion. Progress is being made on the sale of Loryser’s other assets including plant and equipment.


Owners

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

Contractors

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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 concentrat ........


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 stop ........


Crushing and Grinding
Flow Sheet: Source


Processing

Flow Sheet: Subscription required

Summary:

- subscription is required.


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:

Units201820172016
Capital expenditures M USD 9.1   9.3   3.5  
Revenue M USD 37.1   44.2   42.9  
Gross profit M USD -1.1   4   0.8  



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 Nov 1, 2022
....................... Subscription required ....................... Subscription required Subscription required Nov 1, 2022
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.

Subscription required - Subscription is required.

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