| Summary: | Abstract. Originally, in 2008 Areva found Rompas deposit from Ylitornio and later in 2010 Mawson Oy began geological and Quaternary geological exploration in the Rompas-Rajapalot area and surroundings. As a part of Peräpohja schist belt, the area has mineral exploration potential and has interested by exploration companies in 21st century to present. In summer 2010, Mawson Gold Ltd. gathered 83 hand-dug heavy mineral(HM) samples consisting of upper till from Ylitornio and Tervola. Twenty of those samples were included in this master’s thesis. The till samples were sieved under 2 mm fraction and preconcentrated using Knelson MD-3 HM-separator at the University of Oulu in 2014. In 2020, the HM fraction of the samples were micropanned and the final concentrates were studied by using a stereomicroscope at the University of Oulu. Focus was in identification of gold grains and possible indicator minerals from samples. Results of the study left much room for speculations, since gold were found from only 9 samples and only in small quantities. Even in the samples gathered from top of the known deposit in the Rompas-Rajapalot area, quantities were so low that no clear anomaly was detected. In addition, the approximate morphology of the Au grains studied with stereomicroscope showed both angular and well rounded grains. This low quantity of Au is not correlate with earlier observations, especially in the Rompas-Rajapalot area where the grab-samples from weathered bedrock have shown signicant amounts of gold. The reason could be heterogeneous sample materials, variable sample sizes and long transport distance of upper till or secondary movement caused by action during the Ancylus Lake phase.Kullan esiintyminen moreenissa Rompas-Rajapalojen alueella, Ylitorniolla. Tiivistelmä. Vuonna 2010 Mawson Gold Ltd. aloitti malminetsinnälliset kallio- ja maaperätutkimukset Rompas-Rajapalojen alueella Ylitorniolla tarkoituksenaan tutkia ja kartoittaa Arevan 2008 löytämää Au-U-esiintymää. Kesällä 2010 kerättiin yhteensä 83 moreenin ...
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