acqueau workshop helsinki 2015_mining water session_hanna lampinen_agnico eagle
TRANSCRIPT
KITTILÄ
Hanna Lampinen
Acqueau workshop Helsinki 12th of
March 2015
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Kittilä (Finland) 2009–2036
Pinos Altos and Creston Mascota (Mexico) 2009–2025
LaRonde (Canada) 1988–2025
La India (Mexico) 2014–2020
Meadowbank (Canada) 2010–2017
Goldex (Canada) 2013–2017
Lapa (Canada) 2009–2016
Canadian Malartic (50 %) 2011–2028
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MINING LISENCE 1132 HA
55 km north of Kittilä
900 km north of Helsinki
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1986 First gold finding by the Geological Survey of Finland
2010 Stable production
1998 Exploration started by Swedish Riddarhyttan Recourses AB
2012 Open pit mining ended, solely underground mining
2002 Environmental permit for mining 2014 Completion of the new mine office building
2003 Mining license 2014 Completion of the mill expansion project
2005 Agnico-Eagle Mines Limited became a sole owner of Riddarhyttan
2006 Completion of the final feasibility study, decision to build the mine
2008 Ore production started in May, milling in September
2009 The first gold pour in January; the Grand Opening in June
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BACKGROUND FOR AEF PARTICIPATING IN THE PROJECT
- New environmental permit (granted 26th of June 2013, not legally valid yet) states, that the
sulphate concentration in effluent has to be under 2000 mg/l and further on under 1000 mg/l
from year 2017
- At the moment sulphate concentration in effluent is around 8 000 – 11 000 mg/l
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EARLIER STUDIES OF SULPHATE REMOVAL
- VTT studied different options for sulphate removal from effluent in summer 2014
- Technical suitability of these techniques were evaluated:
- Sulphate precipitation as gypsum
- Combined gypsum and ettringite precipitation
- Sulphate removal with biological sulphate reduction (SRB) technique
- Membrane technolologies
- From these the SRB technique was selected for MIWARE project
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MIWARE
- Evaluation of biological sulphate and metal removal- biological method for the treatment of effluent from the Kittilä mine will be tested and optimised in the laboratories and
other facilities of partners involved. The aim is to test the technique to treat the effluent for sulphate and metal removal
and to get the information needed for demonstration on site
- Removal of soluble impurities (sulphate, metals) by precipitation and coagulation
- Sulphate and metal removal (focusing on Sb and As) based on biological methods will be
tested at Agnico Eagle Finland Kittilä mine.
- Also electrocoagulation (EC) or chemical precipitation will be demonstrated at Kittilä
depending on the outcome of earlier work package.
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