Abstract Mining operations disturb the natural hydrological cycle at a local scale by creating new pathways for water flow and conveying large amounts of water, both for use in ore beneficiation and through the dewatering of mining workings. Sulfide minerals exposed to water and oxygen are oxidized through chemical and microbial-enhanced reactions, significantly altering the quality of water (acid mine drainage). Stable isotopes may reveal important information concerning water origin and transfer, as well as chemical processes and solute fluxes within the aqueous environment. Several case studies illustrate the use of stable isotope techniques for clarifying aspects related to water circulation in mining areas within Romania and Finland. Hydrogen and oxygen stable isotopes coupled with total dissolved solids have been used to characterize mine water and for assessing water sources, flow paths and mixing processes at some Romanian mining sites. At Talvivaara mine in Finland, water isotopes and chemical composition were used to determine the extent of waste water contamination in groundwater systems after a leakage at gypsum ponds.

Abstract The Geological Survey of Finland (GTK) has over 130 years of history in mapping and studying mineral resources and their sustainable use. This has resulted in a globally top-ranking geodatabase and profound knowledge of Finnish geology and mineral resources, and has had a crucial impact on the continuously developing mining and exploration business in Finland. The basic mandate of the GTK has remained the same, but the strategic focus and mode of operation have changed considerably to meet new demands. Today, the GTK plays a vital role in providing geoscientific expertise and specialist services for a wide range of stakeholders and commercial clients in government, the business sector, academia and the wider community, in Finland and internationally. The GTK is actively building new ways to co-operate with universities, research organizations and companies to support future development and to expand its own expertise. This is further supported by the proactive use of cutting-edge technologies, such as the geomaterials research infrastructure, which allows studies from the nanoscale up to kilotons for diverse applications of mineral materials. The GTK plans to further strengthen its role as a key player in the minerals sector innovation ecosystems with a focus on primary minerals, the circular economy, digital solutions and water issues, which are expected to be essential factors for sustainable development through the 2020s and beyond. The GTK's main challenge is to ensure the continuous enhancement and renewal of expertise, to adapt and respond to future opportunities.

Abstract Rapakivi granites were in use during the Middle Ages in Finland. Their most spectacular use, however, was for structures built in St Petersburg between 1760 and 1917. Remarkable examples are the majestic and slender Alexander Column and the 112 columns of St Isaac's Cathedral. All Rapakivi granite was extracted from the Wiborg Rapakivi granite batholith in several quarries around the municipality of Virolahti in SE Finland (old Russia). Today, the 1640 Ma-old Wiborg batholith is the most important area for natural stone production in Finland and in the Leningrad region, Russian Federation. The main quarried stone varieties of Rapakivi granite (Baltic Brown, Baltic Green, Carmen Red, Karelia Red, Eagle Red and Balmoral Red) are regularly produced in large quantities in Finland for the global stone market due to the stone's unique qualities. Examples of applications in Rapakivi granite from Finland can be found in the USA, China, South Africa, the UK, Italy, Austria, Ireland, Spain and Germany as well as in Scandinavia and Russia. There are also quarries near Vyborg, the Russian Federation: Vozrozhdenie and Ala-Noskua.

Abstract Soapstone occurs in Finland within Precambrian greenstone belts in the eastern parts of the country. Nunnanlahti and other deposits near Lake Pielinen are the best known and most important of these occurrences. This soft stone is highly workable. Soapstone was one of the most popular ornamental rocks used in architecture of the Jugend (Art Nouveau) style in St Petersburg, Russia, Helsinki, Finland, and in other northern European cities at the end of the nineteenth and into the early twentieth centuries.