Core Viewpoint - The transformation of the former mining area in Tangshan, Nanjing, into a city park demonstrates a successful integration of ecological restoration and economic development, showcasing a model for sustainable urban planning [2][5]. Group 1: Ecological Restoration Efforts - The ecological restoration project began in 2017, focusing on stabilizing the cliff structures without extensive alteration of the mountain [3]. - Approximately 40,000 cubic meters of slope cutting was completed to ensure the stability of the mountain's main structure [3]. - A total of 150,000 cubic meters of waste soil was removed, and 120,000 cubic meters of earth was excavated and filled, raising the average height of the pit area by 1.5 meters to improve soil conditions [3][4]. Group 2: Water Management and Biodiversity - The project includes the construction of various water management facilities such as lakes, ecological ditches, rain gardens, artificial wetlands, and ecological retention pools to create a closed-loop system for water purification [4]. - Grass stacks made from crushed stones and leaves, filled with local plant seeds, were created to enhance biodiversity and provide habitats for wildlife [4]. Group 3: Urban Park Development - The park is designed as an open, shared space for citizens, featuring educational, recreational, and commercial activities, including restaurants, cafes, and a no-power amusement park [5][6]. - The park has attracted over 6 million visitors since its opening in 2019, generating an estimated revenue of 16 million yuan in 2024 from various consumer projects [6]. Group 4: Cultural and Educational Aspects - The park serves as a geological education base, allowing visitors, especially children, to learn about geological processes and the history of mining in the area [7]. - The design incorporates elements that reflect the industrial history of the region, enhancing the cultural significance of the park [7].