The present disclosure provides a comprehensive utilization method and test equipment for surface water, a goaf and geothermal energy in a coal mining subsidence area. The method comprises the following steps: determining a geothermal water collection area, arranging heat energy exchange equipment in a main roadway, and arranging a geothermal water extraction system, wherein the geothermal water extraction system comprises geothermal wells, extraction pipelines and tail water reinjection pipelines, the extraction pipelines are connected with the heat energy exchange equipment, and the tail water reinjection pipelines are connected with a water outlet of the heat energy exchange equipment; arranging a water channel on the surface, and arranging a drainage system on a subsidence trough to guide surface water to flow underground; and controlling directional and ordered flow of surface water through the coal mining subsidence area formed by ground mining to achieve sustainable mining of underground water.

An ecological reconstructed sponge structure of a strip mine dump includes a three-layered sponge ecological structure arranged on a groundmass layer of the dump. From bottom to top, the three-layer sponge ecological structure comprises a water-resisting layer, a water-containing layer and a topsoil ecological layer. A thickness of the water-resisting layer is 100˜200 cm, a permeability coefficient of the water-resisting layer is 0.35˜0.7 m/d, and a degree of compaction is 1200˜1400 KPa. A thickness of the water-containing layer is 150˜250 cm, a permeability coefficient of the water-containing layer is 10˜20 m/d, and a degree of compaction is 800˜900 KPa. A thickness of the topsoil ecological layer is 40˜60 cm. Soil layer thicknesses and water content may be monitored through a ground penetrating radar.

An ecological reconstructed sponge structure of a strip mine dump includes a three-layered sponge ecological structure arranged on a groundmass layer of the dump. From bottom to top, the three-layer sponge ecological structure comprises a water-resisting layer, a water-containing layer and a topsoil ecological layer. A thickness of the water-resisting layer is 100˜200 cm, a permeability coefficient of the water-resisting layer is 0.35˜0.7 m/d, and a degree of compaction is 1200˜1400 KPa. A thickness of the water-containing layer is 150˜250 cm, a permeability coefficient of the water-containing layer is 10˜20 m/d, and a degree of compaction is 800˜900 KPa. A thickness of the topsoil ecological layer is 40˜60 cm. Soil layer thicknesses and water content may be monitored through a ground penetrating radar.

Metal bioremediation and metal mining strategies can include compositions and methods.

Metal bioremediation and metal mining strategies can include compositions and methods.

A process and associated system for the improved reclamation of disturbed lands (e.g., mined lands) is disclosed. In particular, the system including a dewatering cyclone, a screw classifier, and a dewatering apparatus (e.g. a dewatering belt) arranged in series to enable rapid and cost effective dewatering of slurries containing dilute clay and sand tailings to create an improved engineered reclamation material (ERM). The ERM formed by the controlled combining of dewatered sand tailings with dilute clay slurry and with a flocculant and overburden. The ratio of clay:sand:overburden of the ERM may be achieved by balancing the solid content (Cw) and water content (1Cw) materials of the clay slurry, sand tailings and overburden. In some embodiments, the system may include at least one additional component, such as, for example, static screen(s), centrifuge(s), vibrating screens, drum screens, belt screens, belt filters, and/or other liquid-solid separation devices.

A process and associated system for the improved reclamation of disturbed lands (e.g., mined lands) is disclosed. In particular, the system including a dewatering cyclone, a screw classifier, and a dewatering apparatus (e.g. a dewatering belt) arranged in series to enable rapid and cost effective dewatering of slurries containing dilute clay and sand tailings to create an improved engineered reclamation material (ERM). The ERM formed by the controlled combining of dewatered sand tailings with dilute clay slurry and with a flocculant and overburden. The ratio of clay:sand:overburden of the ERM may be achieved by balancing the solid content (Cw) and water content (1Cw) materials of the clay slurry, sand tailings and overburden. In some embodiments, the system may include at least one additional component, such as, for example, static screen(s), centrifuge(s), vibrating screens, drum screens, belt screens, belt filters, and/or other liquid-solid separation devices.

The invention is directed to a method of strip mining that involves dividing the pit into blocks in a diamond shape arrangement with an angular advancing strike face and removing waste material from each diagonally adjacent block so as to minimize the amount of waste material pushed by dozers and maintain the incline of ramps to gradients of 10% or less so that trucks can take mined ore from the pit.

Metal bioremediation and metal mining strategies can include compositions and methods.

Metal bioremediation and metal mining strategies can include compositions and methods.