摘要：Flooding the remaining gaps of lignite open-pits and the formation of so-called open-pit lakes tends to become an increasingly common practice in Romania (in the Oltenia Mining Basin, where the lignite deposit contained in Dacian and Romanian formations was and is extracted through open-pits). This type of ecological reconstruction of former exploitation areas has been applied worldwide for quite a time, and there are many references in this regard in the scientific literature. In this context, the present paper aims to present some preliminary results regarding the ecology of these lakes, being taken as case study the lake formed in the remaining gap of Urdari open-pit, within the Rovinari Mining Basin. However, given the multitude of similar conditions (bioclimate, geological framework, the formation of the remaining gaps, etc.) in which they form, we appreciate that the conclusions of this study can be extrapolated for other lakes in the area (eg. South Peșteana). We point out from the outset that this study presents data on the existing biotope and biocenoses (restricted to species identification), without going into details about populations, ecosystem production, energy and matter flows within it, these investigations being foreseen for a future development stage of the present study.
