1650 the quantities and proportions of useful materials in waste, the quantity of materials in stocks, the availability of material deposit sites. The presence of other waste materials also must be known and determined whether a certain waste material resource can be economically extracted. The same applies to the processing of mass flows of materials and waste materials from urban areas. For the transition from the current state of recycling to the next phase of Urban Mining model, a new knowledge base needs to be developed to convert materials into a better form and use it in a more efficient way. In particular, it is necessary to obtain information on the various possibilities of using the products during its lifetime and the possibility of using its components and materials after the expiry date of the products. The Urban Mining model refers not only to the use of secondary materials from the waste streams, but also to a more effective integrated approach, which also includes the use of energy [5]. The implementation of the Urban Mining model in the vicinity of sources of secondary raw materials can be an important competitive advantage in the operation of mining companies in urban areas. Waste collection and recycling logistics requires a lot of energy consumption, as well as the recycling and recovery processes themselve. Therefore, in the case of the introduction of the Urban Mining model, short transport distances and the use of energy-efficient processes must be ensured. Model is most effective when recycling facilities are located in urban areas. The use of waste energy from various recycling processes can be used in various urban areas for various purposes, for example, for heating or cooling, electricity generation (waste-toenergy), etc, as you can see in Figure 2. Figure 2 - The concept of implementing Urban Mining for urban waste streams [6]. For the implementation of a comprehensive Urban Mining model, we also need to better understand the development and functioning of urban system "city". In particular, it is important to know and take into account the different stages of urban urban development. Most cities are developing and growing, some are in a state of hibernation, and some are in the phase of shrinking. In cities with growth, the import of solid materials, especially building materials, is significantly higher than the export of waste materials from cities. Today, this is especially true for fast growing Asian cities, where the input/output ratio for solid materials is greater than 10:1. For such sites, the processing of waste materials generated in urban areas can not significantly contribute to the satisfaction of demands. For example, recycling of construction waste is important for environmental protection, but it can not completely eliminate the needs to extraction of primary non-renewable raw materials. Knowledge of data on mass waste streams and material stocks in urban areas plays a very important role in introduction of the Urban Mining model. Today, researchers are still not aware of whether it is the
RkJQdWJsaXNoZXIy MTM0Mzk2