Search results for "kaivostoiminta"

Microbial diversity along a gradient in peatlands treating mining-affected waters.

2018

Peatlands are used for the purification of mining-affected waters in Northern Finland. In Northern climate, microorganisms in treatment peatlands (TPs) are affected by long and cold winters, but studies about those microorganisms are scarce. Thus, the bacterial, archaeal and fungal communities along gradients of mine water influence in two TPs were investigated. The TPs receive waters rich in contaminants, including arsenic (As), sulfate (SO42-) and nitrate (NO3-). Microbial diversity was high in both TPs, and microbial community composition differed between the studied TPs. Bacterial communities were dominated by Proteobacteria, Actinobacteria, Chloroflexi and Acidobacteria, archaeal commu…

Catastrophic effects of sand mining on macroinvertebrates in a large shallow lake with implications for management

2019

Sand mining is a human activity that is increasing in inland waters and has profound effects on entire aquatic ecosystems. However, current knowledge of the effects of sand mining on freshwater lake ecosystems remains limited, especially for biotic communities. Here, we investigated the responses of macroinvertebrates to indiscriminate sand mining in a large shallow lake of China. Our results indicated that sand mining significantly increased the content of suspended particulate matter, total nitrogen, total phosphorus and chlorophyll a in the water column both in the sand mining area and the area adjacent to the dredging activities. While there was significantly lower total nitrogen and th…

A social and environmental impact assessment of the Crucitas gold mining project in Costa Rica

2014

In 2008 Costa Rica was facing a critical time in its history. A five year mining moratorium had just ended and mining companies were interested in exploring untapped resources in the country. The country was facing important decisions with which development path to take. The Crucitas Mining Project (CMP) was an issue that the whole country had an opinion on; in fact the Constitutional Court of Costa Rica (SALA IV) was debating what to do with the CMP. The purpose of this study was to assist decision makers by providing a well-rounded assessment of the impacts the CMP would have. The goal of this study was to evaluate whether it would be better for Costa Rica to let the mining operation cont…

Sosiaalisen toimiluvan ehdot ja rajat : Uudenmaan, Pohjois-Karjalan, Kainuun ja Lapin maakuntien asukkaiden näkemykset kaivannaistoiminnan hyväksyttä…

2014

Esipuhe 1. Johdanto 8 2. Sosiaalinen hyväksyttävyys ja sosiaalinen toimilupa 23 3. Aineisto, menetelmät ja analyysi 39 4. Kaivannaistoiminnan hyväksyttävyys 65 5. Kaivannaistoiminnan hyväksyttävyys omassa asuinkunnassa taustamuuttujittain tarkasteltuna 79 6. Kaivannaishyväksynnän yhteys kaivostietämykseen, kaivosalan tuntemiseen, ympäristöasenteisiin ja kaivosnäkemyksiin 98 7. Luottamus lainsäädäntöön ja viranomaisiin sekä eri toimijoihin kaivostoiminnan asiantuntijoina 115 8. Maakunnittaiset erot luottamisessa eri toimijoihin asiantuntijoina 132 9. Luottamus ympäristölainsäädäntöön sekä viranomaisiin ja kaivannaistoiminnan hyväksyttävyys 140 10. Päätöksenteko ja kaivostoiminta 144 11. Res…

Lumbriculus variegatus (Annelida) biological responses and sediment sequential extractions indicate ecotoxicity of lake sediments contaminated by bio…

2018

Abstract We assessed potential ecotoxicity of lake sediments affected by biomining effluents in northeastern Finland. Growth, reproduction and behavior of the sediment-dwelling oligochaete Lumbriculus variegatus (Muller 1774) were used as ecotoxicity endpoints. Standardized chronic bioassays were used for growth and reproduction, and acute and chronic tests with Multispecies Freshwater Biomonitor (MFB) for behavior assessments. Sequential extractions were used to characterize metal bioavailability and exposure conditions in the sediments, which indicated mining-induced contamination gradients of S, Cu, Ni and U and also bioavailability gradients of S and Ni. Among the ecotoxicity endpoints,…

Toxicity of Mining-Contaminated Lake Sediments to Lumbriculus variegatus

2021

AbstractBoreal lakes with soft water and low buffering capacity are susceptible to excess ion loading resulting from metal mining. The impact of two Finish mining sites in downstream lakes was assessed with a chronic sediment toxicity test using a laboratory-reared freshwater Lumbriculus variegatus (Oligochaeta). The test organisms were exposed to mining-contaminated natural lake sediments and hypolimnion water (HLW) or artificial freshwater (AFW) as overlying water in two independent experimental setups. In both test setups, growth and reproduction of L. variegatus were lower in sediments from the lakes receiving high amount of mining effluents from the mines nearby. In the biomining site,…

Condition and Sperm Characteristics of Perch Perca fluviatilis inhabiting Boreal Lakes Receiving Metal Mining Effluents.

2020

AbstractOne of the world’s largest, but low-grade, sulfide nickel deposits in northeastern Finland has been exploited by a bioheapleaching technology since 2008. Bioheapleaching is a relatively new, cost-effective technology, but humid climate, e.g., in boreal temperate environments, causes challenges to the management of the water balance in the ore heaps with wide catchment area, and the mining effluents have caused substantial metal and salting contamination of the receiving waterbodies. In our study, the impacts of metal-extracting bioheapleaching mine effluents on muscle and liver element concentrations, body condition, liver and testes mass, and sperm count and motility of male perch …

Effects of bioheapleaching technology utilizing metal mine emissions on fish in boreal freshwaters

2018

Emissions from metal mining activities are known to deteriorate the quality of aquatic habitats and impair the condition and reproductive potential of fish. Metal extraction by biomining methods has been considered to cause fewer emissions, but for example in Finland, the impacts of a bioheapleaching technology utilizing metal mine on the local freshwaters have been substantial. In this thesis, the impacts of the bioheapleaching mine emissions on three native fish species, brown trout (Salmo trutta) European perch (Perca fluviatilis) and whitefish (Coregonus lavaretus pallasi), were investigated. Manganese and sulphate concentrations have been elevated in the mining impacted waters, and in …

Kokkolan ja Kaustisen seutukuntien kaivostoimintaselvitys

2005

Kannattava ja eettinen kultakaivostoiminta Sierra Leonessa

2012

Tällä tutkimuksella on haluttu selvittää länsimaalaisten ja sierraleonelaisten toimijoiden käsitysten pohjalta, kuinka eettistä Sierra Leonessa harjoitettu, omistajilleen lisäarvoa tuottava, ja kannattava kultakaivostoiminta on suhteessa liiketoiminnan eri sidosryhmiin. Liiketoiminnan kannattavuutta tarkastellaan kannattavuusteorioiden avulla, sekä kannattavuuslaskelmien perusteella. Kultakaivostoiminta on omistajilleen riskisijoittamista, johon liittyy suuret liiketoiminnalliset riskit, mutta myös suuret tuotto-odotukset. Kultakaivostoiminnan vaikutuksia eri sidosryhmiin tarkastellaan sidosryhmäteorian perusteella valittujen tärkeimpien sidosryhmien näkökulmasta. Vaikutusten …