San Rafael Tin Mine

San Rafael Tin Mine

San Rafael is the leading Tin producing mine which currently produces 12% of the world's Tin, it is located in Puno region in the eastern cordillera of the Andes at 4,500 meters above sea level.

San Rafael is an underground mine. The application of the mining exploitation method "Sub Level Stoping" with the variant Large Blast Hole (LBH) for this type of mine composed of hard wall and competent rock. Production for 2014 reached 24,223 tonnes of tin.

Tin accounts for 75% of company sales and by the end of 2016 or the start of 2017, Minsur plans to operate a tailings treatment program at San Rafael that would add an additional 6,000 to 7,000 tonnes of tin to its annual production.

Milestones

  • 2014

    Second Amendment of EIA studies

  • 2014

    Minsur issues 10-year maturity USD 450 million bond

  • 2012

    Bofedal 3 dam heightening up to elevation 4,475 in three stages

  • 2009

    Amendment of EIA studies

  • 2001

    EIA approved for Tailings Dam Bofetall III project

Scotia Capital Inc.
2014

Notes Underwritting

Scotia Capital Inc.

Peru-based miner Minsur issues a 6.25% USD 450 million senior notes due on February 2024 pursuant to Rule 144A and Regulation S under the Securities Act of 1933.

Proceeds are used to repay the company USD 200 million credit facility with the Bank of Nova Scotia and for capital expenditures, including expansion projects, equipment replacement and mine development and for general corporate purposes.

BofA Merrill Lynch, J.P. Morgan and Scotia Capital acted as initial purchasers in the offering.

Source: Minsur S.A
98.183Issue Price (%)6.25Rate of interest per annum (%)450Ammount issued (USD million)
Moody's
2014

Credit ratings

Moody's

Moody's Investors Service assigned a Baa3 senior unsecured rating to Minsur S.A proposed bond issuance of USD 450million. Moody's expects USD 200million of proceeds to be used for debt repayment while the remaining to be used for capital expenditures and general corporate purposes.

Moody's also assigned Senior Unsecured Issuer Rating Baa3 to the issue Minsur, this is supported by Minsur high margins and low leverage along with its position as the third largest tin producer worldwide. The company's low-cost and high-grade position are largely due to its ownership of the world-class San Rafael mine, the world's largest tin-producing mine.

Source: Moody's
SGS del Peru S.A.C.
2014

Air sampling

SGS del Peru S.A.C.

Monitoring of air quality for new build Quenamari Unit - San Rafael.

Determination of concentration of particulate matter (PM10 and PM2.5) and metallic elements of lead and arsenic. Additional monitoring of SO2, CO2, NO2 and O3 using automatic monitors.

Source: Peruvian Ministry of Energy and Mining
Gekko Systems
2013

InLine Pressure Jig (IPJ)

Gekko Systems

Installation of two InLine Pressure Jigs IPJ2400 to increase Overall Plant Recovery by 1%. The Jigs are installed within a gravity concentration with a feeding capacity of 60.5 dried metric tonnes per hour per Jig with a F80 feed size of 0.375 inches.

Both IPJ2400’s are operating with a stroke of 25mm and a pulsation frequency of 70cpm. The inlet water to each hutch is 50m3/hour and the internal wedge wire screen has an opening of 20mm. A ragging bed of 25mm ceramic balls with a specific density of 4.1g/cm covers about 95% of the area allowing flexibility of the formed bed which in turn allows large, heavy particles to report to the concentrate hutch. The down stroke velocity is set at 10 (on a scale of 1 to 10).

The installation of both IPJ2400’s with the ability to handle very coarse feed has resulted in the generation of less tin slimes in the Rod Mill and overall plant recovery has increased by +1% from 90.6 % to 91.6%.

Source: Gekko Systems
Sandvik Mining
2013

Cone Crusher

Sandvik Mining

Installation of a cone crusher in CH440 Sandvik Hydrocone on the secondary crushing circuit in order to reduce the primary crushing mineral product.

The material inlet to the secondary crusher is an F80 product of 4.5 inches obtaining a P80 product of 1.1 inches. Sandvik CH440 effective treatment processing is 170 dried metric tonnes per hour which maintains a power transmission unit with a three-phase electric motor 220KV, 1790 RPM, 60Hz .

Source: Peruvian Ministry of Energy and Mining
170Crushing Plant Capacity (tonnes/h) 25.4P80 crushed product size (mm)114.3F80 feed size (mm)
Sizetec, Inc.
2013

Vibrating screening equipment

Sizetec, Inc.

Installation of 2 vibrating screens with an area of 3'x9' in the preconcentration gravity circuit the same that classified tailings of Jigs Gekkos.Treatment capacity of Vibrating screening is 114 dry metric tons per hour.

The transmission system of each vibrating screening works with a tryphase electric vibrator of 3.3 HP, 1130 RPM, 460 VAC, 60 Hz .

Source: Peruvian Ministry of Energy and Mining
Amec Foster Wheeler
2013
US$ 160.7K

Environmental Impact Assessment (EIA)

Amec Foster Wheeler

Second amendment of Environmental Impact Assessment (AEIA) covering areas of environmental influence, environmental liabilities, archaeological survey, physical and biological aspects, socio-economic component, tailing deposit, effluent collection, environmental management plan, conceptual closure plan.

The AEIA complements the EIA of Tailing Dam Bofetall III project approved in June 2001 and the first amendment of EIA issued in 2009.

According to directorial resolution Nº100-2014-MEM/DGAAM given on February 27th 2014, Peruvian Ministry of Energy and Mines approved the Second Amendment of EIA Tailings Dam Bofetal III for the construction of the Larancota deposit.

Source: Peruvian Ministry of Energy and Mines

Geotechnical studies

Anddes Asociados

Geotechnical studies for tailings deposit Bofedal 2 in order to prepare geotechnical modelling of exploitation and reprocessing. Geotechnical study of thickening plant. Hydrological characterisation of the project area. Running exploratory drilling in the tailings deposits Bofedal Bofedal 2 and 2 1/2.

Works executed for Hatch Asociados.

Source: Anddes Asociados
AWS Consulting SAC
2001
US$ 160.7K

Environmental Impact Assessment (EIA)

AWS Consulting SAC

The Environmental Impact Assessment (EIA) covers areas such as environmental base line including physical, biological and social aspects, description of potential environmental impacts as well as environmental management plan are also included on the studies.

According to directorial resolution Nº174-2013-MEM/AAM given on May 31st 2013, Peruvian Ministry of Energy and Mines approved EIA of Manual Sanitary Landfill Solid Waste Accumulation New Quenamari "San Rafael" project.

Source: Peruvian Ministry of Energy and Mines

More contracts, contractors and photos are included in the PDF.

Snapshot

Capital Expenditure
US$ 1B
Project Status
Production
Production starting date
October 1977
Mine Type
Underground
Mineral reserves (Million Tonnes)
13.9
Metals mined
Tin, Copper
Copper Mineral Reserves
0.16%
Concentrator facilities (tpd)
2,830
Tin Annual Output (Tonnes)
24,223
Tin Mineral Reserves
5.27%
legal.unidad
ACUMULACION QUENAMARI - SAN RAFAEL

Top Contractors

AESA Construcciones S.A.
Knight Piésold
AMEC plc
Amec Foster Wheeler
Cesel Ingenieros

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